SnapBack LIVE!™ Server Backup & Disaster Recovery Suite Users Guide SNAPBACK Sterling House, Back Saint Annes Road West, Saint Annes on Sea, Lancashire, FY8 1RD Phone: +44 1253 780044 Fax: +44 1253 782879 Email: sales@snapback.co.uk WWW: http://www.snapback.co.
SnapBack™ User’s Manual Copyright © 1994 - 1999 Columbia Data Products, Inc. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means - electronic, mechanical, photocopying, recording or otherwise - without the prior written consent of Columbia Data Products, Inc., P.O. Box 163088, Altamonte Springs, FL 32716. Columbia Data Products is a registered trademark of Columbia Data Products, Inc.
Contents INTRODUCTION—WHY SNAPBACK? .........................10 BACKUP BLUES ....................................................................10 Complex Recovery ...........................................................10 File Follies.......................................................................11 The Trouble with Files.....................................................11 THE IMAGE APPROACH ........................................................12 Absolute Backup ...........................
CHAPTER 2— SNAPBACK FOR WINDOWS NT .........35 LOGGING IN .........................................................................35 Console Login ..................................................................36 Connection Types.............................................................36 Server Selection ...............................................................37 User Name and Password................................................38 NT Login Security .........................................
TAPE READER ......................................................................69 CONFIGURATION ..................................................................70 Configure Write Cache ....................................................70 Configure Open Transactions..........................................72 Configure TD-ROM .........................................................73 Configure Errors .............................................................77 Configure Preferences ...............
UTILITIES .............................................................................91 SCANSCSI.NLM ..............................................................91 TAPEUTIL.NLM ..............................................................91 CHAPTER 4— SNAPBACK FOR DOS............................93 STARTING SNAPBACK ..........................................................93 MANUAL BACKUP ................................................................93 AUTOMATIC BACKUP ...............................
DUPS ...............................................................................99 INT13 ...............................................................................99 KEEP ...............................................................................99 LUNS..............................................................................100 MONO............................................................................100 MYLEX...........................................................................
RESTOREAUTO ............................................................111 READONLY ...................................................................111 DEFAULT CONFIGURATION FILE ........................................111 AUTOMATIC RESPONSE FILES ............................................112 CD-ROM IMAGES..............................................................112 Creating the Images.......................................................112 Edit the Image Set ....................................
APPENDIX A— SCSI COMPATIBILITY .....................139 SCSI HOST ADAPTERS .......................................................139 Standard Adapters .........................................................139 RAID Adapters...............................................................141 TAPE DRIVES .....................................................................141 APPENDIX B— TECHNICAL SUPPORT .....................144 CONTACTING TECHNICAL SUPPORT ...................................
Introduction—Why SnapBack? Backup Blues Most backup systems provide a great deal of activities for administrators and users. The backup software requires lists of included and excluded directories because servers sometimes become inaccessible and because special modules purchased, installed, and configured for applications may will be running during backup. In addition, backup operators require security rights for everything.
The Trouble with Files Current backup system problems are essentially problems with files. Backups based on files run under server control. The file server controls security, access, and processing of files. Since files require special handling in order to be shared, special software is required for open files. Since files are protected by security systems, backup software must have complete administrator access to the file system.
SnapBack Live! takes a completely different approach to the backup process. Rather than going through the server file system to access server data, a full binary data image is copied directly from disk to tape. Absolute Backup The SnapBack backup image contains everything on the server drives - the entire operating system, special server files, patches, updates – EVERYTHING.
Native Access Since the SnapBack tape contains an absolute image of the source drives, it is possible to mount a tape as if it were a read-only drive. TD-ROM allows administrators and users to view, recover, or execute files directly from the tape. To an application program, a mounted tape appears to be the original media – no muss, no fuss, no missing files or lost links.
Benefits and Limitations Remote or Local Control SnapBack Console is a Windows application that allows complete control and monitoring of the backup program. Console is a communication front-end for the actual backup engine that runs on the server. Backup status, scheduling, control, diagnostics, and logs are all accessible from any workstation. SnapBack for NetWare also includes NetWare server control programs to allow the same functionality from a server console.
restore any BIOS-compatible or SCSI-based operating system including Unix and OS/2. • Downed Server Backup SnapBack/DOS will back up a downed server. This feature can be used to create an intermediate backup prior to attempting server file repairs. If a repair attempt fails or causes additional corruption, the intermediate backup can be restored. Hardware Upgrades When using SnapBack, images can be restored easily to a larger drive.
Chapter 1— Installing SnapBack Live Package NoteÆ SnapBack Live is available in several configurations. Your version may have a restricted user count and/or may not include all of the Windows NT, NetWare, or SnapBack DUP components. System Requirements NT Server The SnapBack Server for Windows NT is a kernel-mode server-based driver that allows real time backup from connected hard drives to SCSI tape drives.
• SCSI tape drive Windows Console The SnapBack Windows Console program provides a graphical application interface to any (NT or NW) connected SnapBack server. The application runs under Windows 3.1 or greater as well as Windows 95 and Windows NT and includes a comprehensive help engine. • IBM-AT (386 or above) or compatible • MS or PC DOS 3.3 or higher • Windows 3.1 or greater SnapBack Live! 17 INSTALL NetWare Server The SnapBack NetWare Server is an NLM-based server application.
SnapBack DOS SnapBack/DOS is a character-based single-user backup, restore, and utility program. The application can be executed from a single DOS bootable floppy and is capable of backing up and restoring virtually any PC-based operating system. SnapBack/DOS is used to restore images created using SnapBack Live!. • IBM-AT (286 or above) or compatible • MS or PC DOS 5.
Installation for Windows NT and NetWare SnapBack Server is installed on the local hard drive in a server using an attended installation program. The installation steps are: CD-ROM Installation – Place the CD-ROM into the CD-ROM drive. 1b Floppy Disk Installation – Insert the disk labelled “Windows Console Disk 1” into your floppy disk drive. 2 From within Windows, run SETUP.EXE. For installing NetWare from floppy see later in this chapter. 3 The first screen is informational only.
The next screen is the License Agreement. Please read this carefully. If you agree to the terms click YES. If you do not agree to the terms click NO. SnapBack will not allow you to continue the installation process unless you accept the terms of the license agreement. 5 After you have accepted the terms of the License Agreement, you will see the SnapBack User Information Screen. You must enter your name, your company name and your specific product serial number in order to continue.
INSTALL If you are installing an evaluation version of the SnapBack product, the serial number to be entered is zero (0). 6 The next screen will be the confirmation of the information you have just entered. If this information is correct, select YES to continue. If you want to make changes to your User Information, select NO and enter the correct information.
INSTALL 7 Select the directory where you would like to install SnapBack. The default directory is c:\Program Files\CDP Inc. To change the default installation directory, type a new directory path or click the BROWSE button to select an existing directory.
INSTALL 8 When the installation directory is selected, you will be required to select the particular programs you want to install. The console program needs to be installed on a Windows machine so backups can be scheduled. (CDROM users – If you would also like to make a set of floppy disks for safekeeping, you should also select Make Diskettes).
INSTALL The list of programs to select will not display the image above unless the NT/NW Bundle package has been purchased. If installing NT, only the required list will be displayed. If installing NetWare, only the NetWare programs will be displayed. 9 The installation program will now begin preparing the setup files for the programs you have selected. This process only takes a few minutes.
INSTALL This task is for NetWare users ONLY. NT users – not applicable 10. NetWare users are required to enter the server name where SnapBack is to be installed. This step is required and can not be skipped by Novell users. Make sure you know the correct server name or the software will not be installed.
INSTALL After naming the server, you will be instructed to go to that server to complete the Novell Installation by typing “SnapBack” on that system. 11. If you selected the Toolkit/Recovery program when starting the installation, you will now be asked to insert a floppy disk into the floppy drive. This function will add the required SnapBack files to your Disaster Recovery disk, along with several server maintenance tools you can use on any server.
This procedure does not make the complete Disaster Recovery disk for you. There are other files which must also be added. Make sure you carefully read the section in this chapter on “Making a Rescue Diskette” before attempting to use this feature. INSTALL This is only needed if SnapBack Live for NT was installed. Skip to the next step for everything else. 12. The SnapBack Live! installation program is now complete. You can select to reboot the server now, or to reboot later.
INSTALL 13. Select and read RELEASE NOTES for the product you just installed. Your SnapBack Live! installation program will now close.
Installing NetWare from Floppy Disks Note > Prior to installing SnapBack/NW the server must have a SCSI controller, tape drive, and a NetWare ASPI manager installed. 2. You will be presented with “Do you agree with the terms and conditions as stated in the license agreement?” To view the agreement, hit R; to accept the terms, hit Y; or N if you do not agree to these terms and conditions. 3. Install will ask if it can copy files to the server. Select Y for yes.
Installing SnapBack DUP Example: install x: y:\snapdup. SnapBack Live! 30 INSTALL From a DOS prompt connected to the network drive you want SnapBack DUP installed to. Run Install X: y:\dir. Where X is the floppy drive letter the disk is in and y:\dir is the drive and directory you want SnapBack DUP installed.
Making a Rescue Diskette Note > The rescue diskette only need be created once. No backup specific information is recorded on this floppy. If the rescue diskette is lost or damaged any DOS bootable floppy with appropriate ASPI drivers and the SnapBack executables will work. If a server crash occurs, a Rescue diskette and a recent backup tape are all you need to resurrect the server. Building a Disaster Recovery Disk Note > Windows/NT does not support the SYS command.
• A fresh backup tape Building the Rescue Diskette • SYS A: • Edit a:\config.sys • Files=30 • Buffers=20 • Add your disk manager if using IDE drives requiring it. device= example: device=ontrack.sys Note > If you are not using a disk manager such as On-Track or other boot sector manager ignore the above line. 1. Add your ASPI manager driver. Use the appendix for a list of what driver is required for what controller. Device= example: device=aspi8dos.sys 2.
Disk Space Problems Depending on the DOS version and the size and number of device driver files used by your system, you may not have room for SnapBack on a single floppy diskette. Delete Files — You may delete some of the SnapBack utility files. The files SnapBack must have to operate are: • SNAPBACK.EXE • SNAPBACK.OVR • SNAPBACK.
To test the Disaster Recovery diskette follow these steps: 1. Reboot the file server with the rescue disk. It should boot from the floppy, load the ASPI files, and show an A:> prompt. 2. Run SNAPBACK. Navigate through the menus. SnapBack should recognize the hard disks and tape drives attached to the system. 3. Use the Backup function to copy a hard drive to tape. 4. Use the Compare function to test the tape.
Chapter 2— SnapBack for Windows NT Logging In To use the SnapBack Console program you must log into a server that has the SnapBack Server software installed. This is necessary even if you have already logged into the network. SnapBack authenticates the user to the network to ensure that an authorized user is accessing the backup program. However, since SnapBack performs an image-based backup, it overcomes this problem.
Console Login The Console login window requires selection of a Login Type and Server as well as a User Name and Password. Win NT Connection Types SnapBack has the ability to allow you to log in using Bindery or Internet/None. Bindery - Bindery Login is for use with NetWare 3.x versions. It can be used in 4.x versions if Bindery emulation is enabled. Novell Directory Services - NDS Login is used when logging into any NetWare 4.x server.
Internet/None - This selection is for logging in via TCP/IP to a Windows NT server or the Internet. This selection can also be used if you experience trouble using any of the other login types. IP Addressing The first line allows only requests from 192.168.0.10, even if other IP addresses have valid user names and passwords. The second line allows requests from any node on network 192.168.0, and so on.
and incremental searching make it possible to quickly and easily log into any of hundreds of remote servers. When re-entering the logon screen the server name will be set to the last server selected to allow central administrators to easily navigate a collection of remote sites. Windows NT users can use the special server name LOCALHOST to connect to the machine running the client program. The SnapBack Client must be installed on the NT server for this to function.
Server Backup Server backup is straightforward using SnapBack. Simply, specify which drives to back up, which tape drive (or drives) will record the image, and when the backup should occur. Selecting the Backup Drives All drives available for backup will be listed on the left of the screen in the Source Box, under the heading Available Items For Backup. Win NT Select each item to be backed up by highlighting the drive and clicking the ADD button or right click and select ADD from the dropdown menu.
Note > Even though the display image shows partitions and volumes, the selection is for complete hard drives. SnapBack saves entire drive images. Select the Backup Destination Click on the Destination tab to view all tape devices attached to the system. To select a destination device, highlight the device in the Available Tape Drives box and click the ADD button, or right click the item and select ADD from the dropdown menu. If you only have one backup device, SnapBack will automatically select it.
Backup Scheduling The scheduling screen allows entry of the days of the week and times for the selected backup. The backup source, targets, and schedule are collectively termed a “backup set”. Win NT SnapBack allows scheduling of the backup for any day of the week at any time of the day. You can schedule a backup for every Monday at 5:30 PM, every Monday and Wednesday at 3:30 PM, or any combination of days and times.
Note > The SnapBack Console program does not need to be running when the backup is scheduled to occur. The SnapBack server program triggers and performs the backup. Modifying Backup Sets Clicking the JOBS icon will show all scheduled backups for the selected server. Each horizontal line represents one backup set. Each line is a backup set. The server in the figure above has a single backup set while the following figure has two backup sets.
Status Screen The status screen shows current activity on the selected server. This is useful during an immediate backup in order to monitor the progress of the backup. The screen will also report activities triggered by other users (another user running a SnapBack Console) or backups triggered by the scheduler. Win NT Abort - Click this button to abort the current operation. Status - Active function and progress. Tape Status - Status of the tape drive —busy or idle.
attempted immediately. Otherwise SnapBack will resume its operations on the next scheduled backup. Server Statistics - Various statistics about the selected server. Disk I/Os Pending -Number of reads and writes waiting to be processed by the server. Disk Reads Totaling – Number of disk reads the server has completed since the beginning of the job. Disk Writes Totaling – Number of disk writes the server has completed since the beginning of the job.
Tape Reader SnapBack records a header record at the beginning of each backup tape. Clicking the TAPE icon will display the device images recorded on the tape as well as the date and time the tape was recorded. Win NT If more then one tape drive is attached to the server, a selection menu (above) is presented. Select the tape device containing the tape you wish to examine.
The TAPE INFO screen provides the following: Serial Number - Serial number of the backup tape. Backed Up On - Date the backup was created. Tape Number - Tape number if a multiple tape backup. Devices Backed Up - List of hard drives that were backed up on the tape. Devices Connected At Time Of Backup – List of hard drives that were attached to the server when the tape was created. Win NT Configuration The configuration screen allows fine tuning the operation of the SnapBack server.
If a backup is aborted due to insufficient cache size, SnapBack will immediately attempt another backup. This option is set during install. Double Cache File When Limit Exceeded Configures SnapBack to double the cache size when the current size is exceeded. Size of Cache File The current size of the cache file in megabytes. Maximum Cache File Size The maximum size the cache file can expand to. This is due to automatic size doubling.
Win NT Quiescent Wait Time in Seconds This setting controls the duration of server inactivity required before starting a backup. If a backup fails to execute due to lack of inactivity, it is usually caused by an application (such as a FAX server or e-mail manager) repeatedly updating the file system. The recommended solution is to reconfigure the other program to use a longer polling interval or disable it altogether during backup.
Configure TD-ROM TD-ROM allows backup tapes to be mounted as if they were read-only disk drives. This screen allows control of the tape creation and mounting process. Note > The TD-ROM option will not work on spanned or cascaded tapes. Win NT Autoload TD-ROM This will automatically load TD-ROM whenever a successful backup is completed. TD-ROM can be loaded at any time. The default is to not load TD-ROM.
In NetWare, SnapBack will prefix an underscore to the volume name (volume SYS mounts as _SYS). Create Index The index overcomes much of the speed and fragmentation problems normally encountered when using serial media for direct access. This option is checked by default and should only be disabled during troubleshooting or when the backup device is close to capacity. Configure Errors This screen configures disk read error handling.
On Hard Drive Media Errors Abort If this option is checked, SnapBack will abort a backup if it cannot read a sector from the hard drive. If not checked (the default), SnapBack will skip the sector and continue with the backup. It is strongly recommended that this box not be checked.
Configure Preferences This configuration screen allows control of the startup display of the SnapBack Console program. Win NT Show the Tool Bar Specifies whether the toolbar is visible at all times. The default is checked. Opening Window Determines which screen to display when SnapBack loads. Configure Tape Drive This screen configures tape drive options. SnapBack automatically configures these settings for optimal performance.
Win NT Block Size The Block Size is the physical block size used to write to the tape device. This is automatically configured to provide the maximum backup performance. Transfer Size The Transfer Size sets the buffer size used to transfer data to the tape device. Increasing the size of the buffer may increase the transfer speed on some tape drives but will also require more memory from the cache buffers below the 16MB pool. Compression Compression can be set for “Default.
Eject Tape This option configures SnapBack to eject the tape after a successful backup. If you are planning to mount a volume after a backup is completed, leave this setting turned off (the default). This option should not be used on manual eject tape drives. Invalidate Header This will configure SnapBack to invalidate a backup tape if a problem occurs during backup. This prevents any misconception that a backup was good when it was not completed successfully.
to 2GB, if this option were checked. The default setting is not checked. Note > If the disk drive is larger than the backup tape leaving the disk partially un-partitioned is a viable interim backup solution. Pause During User I/O With this setting enabled, SnapBack will pause the backup when user I/O is sent to the server, giving the user top priority. To maintain server responsiveness during backup, leave this option set (the default).
so setting it to a higher value (like 10 seconds) doesn’t impact its performance, however it will allow SnapBack to get the required window. 2. If the above is not possible, you can have SnapBack execute external program files as predetermined points to start, stop, or pause applications. Three files are used to provide this capability: POSTINIT.BAT which is executed as soon as the quiescent window is achieved, but before the backup starts.
Create a REG_SZ (String) value "ChildUser" that contains the name of the user. Also create another String value called "ChildPassword" containing that user’s password. If no password is required for the user, leave the value empty. The user must have access to the directory where SnapBack NT is installed. Any login scripts will NOT be executed, so if any network drives or other resources are needed, you will have to "net use" them in the batch file. The files "POSTINIT.BAT" and "POSTBACK.
Here is an example you can use to stop Microsoft's IIS 4.0 Certification server for at least 15 seconds (if the quiescent window is set for 15 seconds): "PREBACK.BAT" rem Stop the MS IIS 4.0 Certification server net stop certserv rem Write to the snapback log file saying the service was stopped echo MS IIS 4.0 server stopped. >>logs\snapback.log rem Restart the MS IIS 4.
Chapter 3— SnapBack for NetWare Logging In To use the SnapBack Console program, you must log into a server that has the SnapBack Server software installed. This is necessary even if you have already logged into the network. SnapBack authenticates the user to the network to ensure that an authorized user is accessing the backup program. However, since SnapBack performs an image-based backup, it overcomes this problem.
Console Login The Console login window requires selection of a Login Type and Server as well as a User Name and Password. Netware Connection Types SnapBack has the ability to allow you to log in using Bindery, NDS or Internet/None. Bindery - Bindery Login is for use with NetWare 3.x versions. It can be used in 4.x versions if Bindery emulation is enabled. Novell Directory Services - NDS login is used when logging into any NetWare 4.x server.
Internet/None - This selection is for logging in via TCP/IP to a Windows NT server or the Internet. This selection can also be used if you experience trouble using any of the other login types. IP Addressing The first line allows only requests from 192.168.0.10, even if other IP addresses have valid user names and passwords. The second line allows requests from any node on network 192.168.0, and so on.
and incremental searching make it possible to quickly and easily log into any of hundreds of remote servers. When re-entering the logon screen, the server name will be set to the last server selected to allow central administrators to easily navigate a collection of remote sites. User Name and Password After selecting the Login Type and Server name, enter your network login information and click OK. If the user name and password are correct, the main SnapBack Console window will be displayed.
Note > You must know the current context and the context of the user object to log in using the relative distinguished login name. It is easier to include the full path to the user object by specifying the distinguished login name. This allows login regardless of the current context. Server Backup Server backup is straightforward using SnapBack. Specify which drives to back up, which tape drive (or drives) will record the image, and when the backup should occur.
drives as you like to the backup set. You may remove drives from the selected backup following this same process. Note > Even though the display image shows partitions and volumes, the selection is for complete hard drives. SnapBack saves entire drive images. Select the Backup Destination Click on the Destination tab to view all tape devices attached to the system.
If you choose Backup Now, SnapBack will immediately start the backup and display the status screen. Selecting Backup Later will activate the scheduling screen. Backup Scheduling The scheduling screen allows entry of the days of the week and times for the selected backup. The backup source, targets, and schedule are collectively termed a “backup set”. Netware SnapBack allows scheduling of the backup for any day of the week at any time of the day.
When you click OK, the schedule will be stored on the server and the backup executed as scheduled. Note > The SnapBack Console program does not need to be running when the backup is scheduled to occur. The SnapBack server program triggers and performs the backup. Modifying Backup Sets Clicking the JOBS icon will show all scheduled backups for the selected server. Each horizontal line represents one backup set. Days of the week are displayed in black with the current day displayed in white.
Status Screen The Status screen shows current activity on the selected server. This is useful during an immediate backup in order to monitor the progress of the backup. The screen will also report activities triggered by other users (another user running a SnapBack Console) or backups triggered by the scheduler. Netware Abort - Click this button to abort the current operation. Status – Active function and progress. Tape Status - Status of the tape drive —busy or idle.
attempted immediately. Otherwise SnapBack will resume its operations on the next scheduled backup. Server Statistics - Various statistics about the selected server. Disk I/Os Pending -Number of reads and writes waiting to be processed by the server. Disk Reads Totaling - Number of disk reads the server has completed since the beginning of the job. Disk Writes Totaling - Number of disk writes the server has completed since the beginning of the job.
Tape Reader SnapBack records a header record at the beginning of each backup tape. Clicking the TAPE icon will display the device images recorded on the tape as well as the date and time the tape was recorded. The TAPE INFO screen provides the following: SnapBack Live! 69 Netware If more then one tape drive is attached to the server, a selection menu (above) is presented. Select the tape device containing the tape you wish to examine.
Serial Number - Serial number of the backup tape. Backed Up On - Date the backup was created. Tape Number - Tape number if a multiple tape backup. Devices Backed Up - List of hard drives that were backed up on the tape. Devices Connected At Time Of Backup - List of hard drives that were attached to the server when the tape was created. Configuration The configuration screen allows fine tuning the operation of the SnapBack server. The default values are adequate for most systems.
If a backup is aborted due to insufficient cache size, SnapBack will immediately attempt another backup. This option is set during install. Double Cache File When Limit Exceeded Configures SnapBack to double the cache size when the current size is exceeded. Size of Cache File The current size of the cache file in megabytes. Maximum Cache File Size The maximum size the cache file can expand to. This is due to automatic size doubling.
Configure Open Transactions SnapBack delays the backup until the server has a configurable period of inactivity. This ensures that the server is in a stable state when the backup image is created. Netware Quiescent Wait Time in Seconds This setting controls the duration of server inactivity required before starting a backup. If a backup fails to execute due to lack of inactivity, it is usually caused by an application (such as a FAX server or e-mail manager) repeatedly updating the file system.
Quiescent Timeout in Minutes This setting controls how long SnapBack will wait for the inactivity span mentioned above. The default setting of 60 minutes means SnapBack will wait up to an hour before abandoning the backup. This time can be set to a maximum of 1440 minutes (24 hours). Configure TD-ROM TD-ROM allows backup tapes to be mounted as if they were read-only disk drives. This screen allows control of the tape creation and mounting process.
SnapBack will generate a unique volume name to prevent confusion between the actual disk volume and mounted tape volume. In NetWare, SnapBack will prefix an underscore to the volume name (volume SYS mounts as _SYS). Create Index The index overcomes much of the speed and fragmentation problems normally encountered when using serial media for direct access. This option is checked by default and should only be disabled during troubleshooting or when the backup device is close to capacity.
This option is the ID number of the SCSI host adapter. This option is necessary if there are multiple SCSI adapters on the server. Values range from zero to three. BS = ##### Specifies the physical block size of the tape in bytes. The default is 512. Values can be 512, 1024, 2048, 4096, 8192, 16384, or 32768. WIDE Forces TD-ROM to scan for target ID numbers that are greater than seven. ID numbers greater than seven are used for some controllers that support more than eight devices.
If the same tape is mounted more than once, TD-ROM will reuse the index file originally loaded. The PURGE keyword will force the disk index image to be reread from tape. Note > The following parameters (MAX, NUMBUFS, and BUFSIZE) can be used in conjunction with one another to increase TD-ROM performance. This requires more memory consumption from a limited pool of system memory. When changing the default values, do so gradually while monitoring system performance and potential out-of-memory errors.
Configure Errors This screen configures disk read error handling. If this option is checked, SnapBack will abort a backup if it cannot read a sector from the hard drive. If not checked (the default), SnapBack will skip the sector and continue with the backup. It is strongly recommended that this box not be checked.
Configure Preferences This configuration screen allows control of the startup display of the SnapBack Console program. Netware Show the Tool Bar Specifies whether the toolbar is visible at all times. The default is checked. Opening Window Determines which screen to display when SnapBack loads.
Configure Tape Drive This screen configures tape drive options. SnapBack automatically configures these settings for optimal performance. Netware Block Size The Block Size is the physical block size used to write to the tape device. This is automatically configured to provide the maximum backup performance. Transfer Size The Transfer Size sets the buffer size used to transfer data to the tape device.
Compression Compression can be set for “Default.” To use the tape drive default mode, select “On” to turn the tape drive compression on (if available), or select “Off” to disable the tape drive compression. Eject Tape This option configures SnapBack to eject the tape after a successful backup. If you are planning on mounting a volume after a backup is completed leave this setting off (the default). This option should not be used on manual eject tape drives.
Backup Partitions Only Enabling this option configures SnapBack to backup only the partitioned area of the hard drive (as defined in the master boot record). For example, if you have a 40MB DOS partition and a 1023MB NetWare partition on a 2GB hard drive, SnapBack would back up only 1063MB, as opposed to 2GB, if this option were checked. The default setting is not checked. Note > If the disk drive is larger than the backup tape, leaving the disk partially un-partitioned is a viable interim backup solution.
SnapBack automatically runs PREBACK.NCF before each backup and POSTBACK.NCF after completion. Both files must be in the SYS:\SYSTEM\SNAPBACK directory. You can create these files using the NetWare EDIT program. To create a PREBACK file from the system prompt on the server, execute the following command: LOAD EDIT SYS:\SYSTEM\SNAPBACK\PREBACK.NC F This is an example of PREBACK.NCF contents: UNLOAD SCAN.NLM UNLOAD MHS.NLM NetWare Resize RESIZE.
4. Use SnapBack to restore the original drive image to the new drive. 5. Reboot the system to confirm that the restore was successful. 6. Run RESIZE.EXE from DOS. 7. Select the drive to resize from the Main Menu. 8. Select NetWare 386 from the FDISK Partition Menu and press . 9. Select CONTINUE the resize operation. 10. The next screen displays the current partition size and the new maximum size. Enter a new size or use the suggested size. 12. Start NetWare and LOAD INSTALL from NetWare console. 13.
Where: D specifies the backup source device number, if missing specifies as all hard drives. T specifies the backup target device number. W specifies when the backup should occur, if missing the backup is performed immediately. D is the day (0=Sunday, 1 = Monday, .. ,6=Saturday). H is the hour (0 to 23). M is the minute (0 to 59). Use SNAP LIST to get a list of device numbers. Example: SNAP BACKUP t=1 Backs up drive zero to tape one.
CONFIG Syntax: SNAP CONFIG Writes the server configuration to the file: SYS:\SYSTEM\SNAPBACK\LOGS\CONFIG.LOG DELJOB Syntax: SNAP DELJOB # Deletes job number ‘#’ from the scheduled backup set. See “JOBS” to display job numbers. Dismounts volume x, where ‘x’ is the tape volume name. SNAP DISMOUNT _SYS HELP Syntax: SNAP HELP Displays a brief listing of available commands and parameters. LIST Syntax: SNAP LIST Displays devices that SnapBack has detected.
JOBS Syntax: SNAP JOBS Displays currently scheduled backup sets. LOAD Syntax: SNAP LOAD x Loads TD-ROM with x parameters (bs=, target=, etc.). See Chapter 6 for TD-ROM parameters. LOG Syntax: SNAP LOG message text MOUNT Syntax: SNAP MOUNT x Mounts volume x from tape, where ‘x’ is a volume name. SNAP MOUNT _SYS RESTORE BINDERY Syntax: SNAP RESTORE BINDERY Restores the bindery from tape. SnapBack Live! 86 Netware Appends the ‘message text’ to the current SnapBack log file along with the date and time.
RESTORE NDS Syntax: SNAP RESTORE NDS Restores the NDS and, optionally, the bindery from the tape. SCAN Syntax: SNAP SCAN Scans for ASPI devices. SnapBack will rescan the SCSI bus before each backup. Netware STATUS Syntax: SNAP STATUS Displays the current status of SnapBack. UNLOAD Syntax: SNAP UNLOAD Unloads TD-ROM. VERSION Syntax: SNAP VERSION Displays version information.
VIEW Syntax: SNAP VIEW [#] Displays the tape header information where # is the tape drive number. If you do not specify a number, SnapBack will show the headers for all tape drives. SNAP_ENG Parameters SNAP_ENG.NLM is usually loaded from the file SNAPLOAD.NCF. The following parameters may be appended to the load line to modify the default behavior. Multiple parameters may be specified if separated by spaces.
LOAD SNAP_ENG mem=2048 (for 2 MB) LOAD SNAP_ENG mem=1024 (for 1 MB) Warning > Using less memory for SnapBack can cause the backup to abort during heavy I/O traffic. MEM is used in conjunction with SUB to configure memory allocation. CACHE Syntax: LOAD SNAP_ENG CACHE=x DELAY Syntax: LOAD SNAP_ENG DELAY Causes SnapBack to delay creating a cache file until a backup occurs. SnapBack normally creates the cache file when SNAP_ENG is loaded. LUNS Syntax: LOAD SNAP_ENG LUNS=x Sets the maximum SCSI LUN to scan.
SUB Syntax: LOAD SNAP_ENG SUB=x Sets the granularity in Kilobytes used for memory allocation. The default value is 512, causing allocation to occur in ½ MB chunks. May be set to a smaller value (minimum is one) if SnapBack runs out of memory when starting a backup. WarningÆ SUB is used in conjunction with MEM to configure memory allocation. The value of MEM divided by SUB must not exceed 10,000. Specifies the minimum space to leave on volume SYS while creating or expanding the cache file.
WIDE Syntax: LOAD SNAP_ENG WIDE Scans SCSI ID’s greater than seven on WIDE and WIDE/FAST controllers. Utilities SCANSCSI.NLM SCSI scan NetWare Loadable Module. SYNTAX: From the file server console type: LOAD SCANSCSI [/s] (WIDE) Netware /s = Scan Luns 0-7 (Default = scan Lun 0 only) DESCRIPTION Utility that scans the SCSI bus for compatible SCSI devices. Must load NetWare ASPI Manager prior to loading. TAPEUTIL.
Rewind, Retention, Load, Unload, Erase). Must load NetWare ASPI Manager prior to loading.
Chapter 4— SnapBack for DOS SnapBack Live! is primarily a server backup tool. One of the components of the suite is SnapBack/DOS – a selfcontained backup and restoration utility. You must run SnapBack/DOS in order to perform a server recovery. The program is also used for creating backups if the server should become unstable or unbootable. TipÆ If a server becomes unbootable or begins to fail, use SnapBack/DOS to create an image backup before attempting diagnosis or repair.
Automatic Backup SnapBack/DOS includes CONFIGURATION screens that can define an automatic backup set. To set the automatic configuration, select AUTOMATIC settings from the configuration menu and define the backup set as described above. Save the configuration. To use the saved configuration, run SnapBack with the Auto parameter: SNAPBACK /AUTO SnapBack will prompt for confirmation, then execute using the saved backup configuration.
Configuration The Configuration Menu allows configuration of various options for running SnapBack in both manual and auto modes. Configure Auto or Manual Mode Select Configure Manual Mode to configure for menudriven use and Configure Auto Mode to set the configuration for automatic use. View Current Configuration Displays the current configuration. Toggle Cascading Allows use of multiple tape drives during backup. Toggle Error Log Reporting Controls writing to the log file.
Note > Most tapes do not require formatting. Change Read Retries Controls the number of times SnapBack will try to re-read disk sectors that report an error. Change Read Passthru If SnapBack encounters an unrecoverable read error, it will skip the block if Read Passthru is enabled. Otherwise the backup is aborted. Auto Eject If the backup completes successfully, SnapBack rewinds and ejects the tape cartridge from drive (if supported by the tape drive).
Note > If you do not create an index, it will be difficult to recover individual files. SnapBack must read the entire tape before an individual file can be recovered. This process can take as long as a complete backup. Save Configuration Select this option to save configuration changes to disk. SNAPBACK/DOS Command Options The following options can be used to modify the operation of SnapBack/DOS. The options can be typed on the DOS command line (as shown in the examples) or placed in the file DEFAULT.CFG.
AMIMEGA Syntax: SNAPBACK /AMIMEGA Scans for AMI Mega RAID PCI controller disk devices. AUTO Syntax: SNAPBACK /AUTO Executes an automatic backup using the parameters saved as the automatic configuration. ASPI Syntax: SNAPBACK /ASPI Scans for ASPI disk devices. BLOCKSIZE Syntax: SNAPBACK /BLOCKSIZE=# BIOS Syntax: SNAPBACK /BIOS Forces access via the bios instead of interrupt 13 CAM Syntax: SNAPBACK /CAM Scans for CAM disk devices. SnapBack Live! 98 DOS Sets tape block size in bytes.
COMPAQ Syntax: SNAPBACK /COMPAQ Scans for Compaq Smart Array Raid Controller EISA/PCI disk devices. CPQPCI Syntax: SNAPBACK /CPQPCI Scans for PCI Compaq Smart Array Raid Controller disk devices. DUPS Syntax: SNAPBACK /DUPS If drives still cannot be seen using other switches, use this switch. DOS INT13 Syntax: SNAPBACK /INT13 Scans for disk devices using interrupt 13H. KEEP Syntax: SNAPBACK /KEEP Keeps tape header intact if the backup fails.
LUNS Syntax: SNAPBACK /LUNS Scans SCSI logical unit numbers zero through seven. The default is to scan LUN zero. MONO Syntax: SNAPBACK /MONO Displays using monochrome monitor. MYLEX Syntax: SNAPBACK /MYLEX Scans for Mylex DAC-960 RAID disk devices using firmware versions 2.x and earlier. Scans for Mylex DAC-960 RAID disk devices using firmware versions 3.x and later. NCR Syntax: SNAPBACK /NCR Uses the NCR motherboard SCSI adapter.
NG Syntax: SNAPBACK /NG Uses CGA-compatible graphics display. normally uses a semi-graphical VGA display. SnapBack NOOVERWRITE Syntax: SNAPBACK /NOOVERWRITE Aborts backup if tape inserted was last tape backed up (auto mode only). This option disables automatic tape formatting. NOZEROBOOT Syntax: SNAPBACK /NOZEROBOOT Does not zero the boot sector during restore. SnapBack normally zeros the boot sector at the start of a restore operation to prevent booting if the restore should fail.
UPDATE Syntax: SNAPBACK /UPDATE Updates DOS time from CMOS. WIDE Syntax: SNAPBACK /WIDE Scans SCSI target numbers zero through sixteen. The default is to scan targets zero through seven. SCSI Bus Scanning Utility SNAPSCAN.EXE is a DOS based application that displays information about a SCSI device for troubleshooting or general information. Run SNAPSCAN.EXE from DOS. Select a device from the Devices Found menu.
LUN Logical Unit Number of the device Device Type Type of SCSI device (i.e., DASD, Sequential, etc.) Block Size Block Size of device (i.e., 512, 1024, 2048, etc.) Number of Blocks Capacity of device by blocks (DASD devices only) Size Capacity of device in megabytes (DASD devices only) Interface Protocol controlling device WASH.
WASH C: Will fill the unused areas on drive C: with zeroes. WASH D:/C:13 Will fill the unused areas on drive D: with the number thirteen.
Chapter 5— SnapBack DUP SnapBack Dup is a character-based single-user image backup and restore program. The application runs from a network file server using a single DOS bootable floppy. It is capable of backing up and restoring virtually any PC-based operating system. It is based on SnapBack for DOS. Select the Image Name Dup will display a list of images available on the server.
Selecting the Backup Drives After scanning the workstation for hard drives, Dup will display an option menu on the left side of the screen and a configuration status display on the right (configuration settings are discussed in the Chapter “SnapBack For DOS”). Select “Backup” from the menu. Drive Select Menus Dup will allow selection from “Backup selected drive/partitions”, “Backup single drive”, or “Backup all drives”. Selecting “single drive” will offer a menu of drives on the system.
Free Space Warning If there isn’t adequate space to store the selected image on the server, Dup will display a warning dialog. If compression is enabled it may be possible to successfully complete the backup (a good rule of thumb is to expect a two-to-one compression ratio). The dialog allows selection of “Continue”, “Overwrite”, or “Cancel”. “Continue” will continue with the backup operation, but will write the new image to a temporary file.
Automatic Restore The saved configuration can also be used to perform an automatic restore. The automatic parameters must be saved as described above. To use the saved configuration for restoration, run SnapDup with the “RestoreAuto” parameter: SNAPDUP /RESTOREAUTO Dup will prompt for confirmation, then restore the workstation using the saved configuration. Automatic restore is useful for restoring a workstation by nontechnical users. You usually also specify what file to restore using the /F: parameter.
Command Line Options Many runtime options can be controlled through options placed on the SNAPDUP command line. Options are placed on the command line preceded by a forward slash and separated by spaces. SnapBack DUP supports all the command lines from "SnapBack for DOS" in addition to: @ Syntax: SNAPDUP @filename.ext Processes each line within “filename.ext” as a command line option. AUTO Syntax: SNAPDUP /AUTO Executes an automatic backup using the parameters saved as the automatic configuration.
Example: SNAPDUP /BASE:Y:\IMAGES\ACCTING CONTROL Syntax: SNAPDUP /CONTROL:path Stores and retrieves all control file information from the specified path. The control file path should be common to all SnapBack Dup users. Example: SNAPDUP /CONTROL:Y:\SYS\SNAPDUP\CONTROL DANGERNOWARNING Syntax: SNAPDUP /DANGERNOWARNING When used in conjunction with the “AUTO” or “RESTOREAUTO” options causes the backup or restore to proceed without any user prompting.
differential backup would be “D33DC33C.01”, the second “D33DC33C.02”, and so forth. IMAGE Syntax: SNAPDUP /IMAGE:path Stores and retrieves all differential images from the specified path. Example: SNAPDUP /IMAGE:Y:\IMAGES\BASE RESTOREAUTO Syntax: SNAPDUP /RESTOREAUTO Executes an automatic restore using the parameters saved as the automatic configuration. READONLY Syntax: SNAPDUP /READONLY Default Configuration File Options can be defined in a default configuration file named “DEFAULT.CFG”.
backup using the path “Y:\DUP\CONTROL” for control files and “Y:\DUP\IMAGE” for the images: /CONTROL:Y:\DUP\CONTROL /IMAGE:Y\DUP\IMAGE /BASE:Y:\DUP\IMAGE Automatic Response Files Automatic response files use the same format as the default configuration file. The file names are placed on the SnapBack Dup command line preceded by an “@” character.
Customize DEFAULT.CFG to use the CD-ROM drive letter which will be active when the workstations are restored (see Chapter 2 and/or 3 for “Default Configuration File”). Use a drive letter that is high enough to ensure that it will be above those used by physical devices (such as “K:”). If you are including a batch file to run SnapBack Dup on the CD, add the command line argument “/READONLY” to prevent Dup from attempting to write to the CD.
provides long descriptions and menu support for multiple images, a master CD could contain a collection of common standard configurations. Using Differential Images Differential images allow storage of several complete workstation images based on a common base image. A base image might consist of a standard Windows 95 installation. Installing Microsoft Office, then creating a differential image would only save the differences made by the installation of Office.
Update the Model Workstation Configure whatever changes are necessary on the model machine. These can include new software and data installations, configuration changes, or application deletions. Create the Differential Backup Make a SnapBack Dup backup of the workstation as usual, except select “New SnapBack Dup Differential Image”. You will be prompted to select a base image and a name for the differential image.
Restoring a SnapBack tape creates an exact image of the drives that were backed up. The correct hardware must be in place before any restore operation. Do not format or partition the replacement media. SnapBack restores all formatting, boot sectors, partition table, operating systems, and file data to the replacement drives. SnapBack also scans the media as it restores and warns of any errors.
TD-ROM allows access to the backup tape just as if it were a read-only hard drive. Users can copy, read, and execute files directly from the tape. WarningÆ It is best not to use Windows 95 or NT Explorer on a TD-ROM tape. Explorer reads icon images from every file on the drive. This causes very slow execution. Use other applications, such as Windows 3.1 File Manager, or the DOS prompt.
NetWare 4.x NoteÆ Mounted volumes must be added to the NDS tree before they are visible to workstations. Users with bindery emulation will have immediate access to mounted volume. To select a tape volume, click the UPDATE button. Type the volume name in the Volume field or click the down arrow to select from a list. All volume names from the tape are modified to distinguish them from disk volumes. NT tape volumes are named with the server name, a dot, and the original drive letter.
Restore Select the TD-ROM operation from MOUNT, DISMOUNT, LOAD, or UNLOAD TD-ROM command buttons. Mount - Mount a tape volume and map to the indicated drive. This command will automatically load TD-ROM, if necessary. Dismount - Will remove the indicated drive letter from the system mapping and unload TD-ROM if this is the last mapped drive. Load TD-ROM - Loads TD-ROM and maps the tape. If TD-ROM is already loaded the tape will be re-read.
2. On the OLD hard drive, go to the server directory and copy all the files to floppy disks. On NetWare 4.x, the directory is c:\nwserver, on 3.12 it is c:\server.312. If replacing the hard drive, remove the old drive and install the new one. 3. Boot from a DOS floppy FDISK the drive, and create a DOS partition (40MB recommended). Run FORMAT C:/s Restore the NetWare files and directories saved in Step 2 to the disk. 4. Run SERVER.EXE Answer the prompts for File Server Name and IPX Internal Net.
Select the volume source image . Select the hard drive destination. You will see a menu with all existing volumes on the destination drive. Select to start the restore. SnapBack does NOT support overwriting existing volumes. Repeat if you have more volumes to restore. 7. Reboot the system. The server should recognize the new volumes. Restoring NetWare Bindery SnapBack can restore the NetWare Bindery database without restoring the entire image or volume.
NetWare Directory Services Note > NDS trees that are replicated or distributed throughout an Intranet are not entirely contained within a single image backup. Changes made on a distributed NDS are propagated throughout the network as time-based updates. It is impossible to guarantee that restoration of a single node in an NDS tree can be synchronized with the remainder of the network.
Note > The NDS database will not be recognized on the server if DS.NLM is not loaded. SnapBack Live! 123 Restore Synchronizing a Restored NDS. Load DS.NLM after the tape restoration is complete. If there are replicas on the network, load DSREPAIR and re-synchronize the restored server with the rest of the NDS Tree. See the Novell documentation for further information. It is not necessary to down the server before resuming normal operations.
Chapter 7— Troubleshooting Window NT SnapBack Console will create this group after the first successful log in. The install program does not make this group. This group should be a Local group, not a Global group. Login messages, Windows NT Console “WINRPC: Connection was refused” Console “Error connecting with server” Console “Error XXXX attaching to Server” Console “Error XXXX while trying to Login” Windows NT servers can only connect using Internet/None protocol on the console login screen.
• The user is a member of the SnapBack Operators group. If this group does not exist, create it as a local group using User Manager. My NT server does not show up in the server list. Error message “Error FFFFFD63 trying to login to DS tree” Error message “Error 89FC attaching to server XXX” You must use the “Internet/None” protocol to connect to an NT server. When dismounting TD-ROM, I get an error stating the volume is in use, but I am not using the volume.
Message “An incompatible filter driver has been loaded” when starting backup. If you are using software to SPAN or STRIPE drives, contact technical support. Otherwise, if using ftdisk.sys for mirroring (RAID 1), resolve this problem by changing the value of registry key: HKEY_LOCAL_MACHINE\ SYSTEM\ CurrentControlSet\ Services\ sbotman\ Tag from one to five. SnapBack Live won’t run without a network card. SnapBack Live! requires a network card to function. Any kind of network adapter will work.
• Select “TCP/IP” and hit “Properties”; for the IP Address type in 192.168.0.1; for the Sub-net mask type in 255.255.255.0. Leave everything else alone. This is a class C IP address reserved for private networks. • Reboot. Trouble SnapBack Live! should now load without error. NetWare NetWare 3.11 Login messages Server “Could not create svc handles for circuit_n” Server “netdir_getbyname: n2a: service name not found” Console “WINRPC: Connection was refused” On NetWare 3.
Note > If using STRTL5.EXE, the following note applies as well. Trouble To install LIBUPx.EXE: MD C:\TEMP CD C:\TEMP \LIBUPx.EXE INSTALL To install STRTLx.EXE: MD C:\TEMP CD C:\TEMP A:\STRTLX.EXE MAP G:=SYS: G: CD SYSTEM COPY C:\TEMP\3.X\*.NLM NetWare 3.x Cannot login Server message “spx: can’t create an RPCBIND service!” Console message “WINRPC: Connection was refused” If you have installed STRTL5.
• • Use NDS. Try Internet/None log in. NetWare All Versions The ASPI manager for the SCSI controller is probably not loaded in the STARTUP.NCF or AUTOEXEC.NCF File. SnapBack does not see any devices using NetWare 4.x. Use DSKs instead of CDMs or HAMs. Message “Loader cannot find public symbol “ASPI_Entry”. Load a NetWare ASPI Manager. Message “Error SnapBack support modules not loaded”. Make sure SBOT_MAN.DSK is loaded first in the STARTUP.NCF file. Message “Out of memory. See troubleshooting guide.
When mounting a SnapBack tape using TD-ROM, you receive the following error message on the server System Console:"Cache Allocator Out of Memory". Memory must be registered before the SYS volume is mounted. The register memory command must be in the AUTOEXEC.NCF. The AUTOEXEC.NCF must be on the DOS boot device (either a floppy or a DOS boot partition on the hard disk). This avoids mounting volume SYS before memory is registered. If the AUTOEXEC.
SET AUTO REGISTER MEMORY ABOVE 16 MEGABYTES =OFF SET RESERVED BUFFERS BELOW 16 MEG =200 4. Edit “autoexec.ncf” on the DOS partition Trouble 5. Add the following lines obtained from your “sys:\system\autoexec.ncf” to the top of the file file server name servername ipx internal net address 6. Register your memory register memory 1000000 ???????? 7. At the end of the “autoexec.ncf” on the DOS partition add mount all sys:\system\autoexec.ncf NetWare 4.x In the STARTUP.
When using TD-ROM on volumes that have been spanned (either across drives or on the multisegmented on the same drive), TD-ROM may be slower than normal accessing files. Windows Console Message, NetWare Server “Can’t initialize IPX/SPX” Console uses the following dynamic link libraries. NWCALLS.DLL NWIPXSPX.DLL NWLOCALE.DLL Correct versions of these libraries are installed SnapBack. Other software packages may overwrite with earlier versions.
These files can be found in LANDR5.EXE or above. This is the oldest file set known to work. Later versions (file dates after those shown) should work as well. “WINRPC: Unknown Host 10000” Ensure that SNAPLOAD is in the AUTOEXEC.NCF file. Windows Console Message “WINSOCK.DLL Not Found” Upgrade from DOS 5.0 to 6.22. Windows Console Message “WINRPC: Unknown Host 10000” “WINRPC: Unknown Host 5” Run SnapBack TCP instead of SnapBack SPX. Windows Console Message, NetWare Windows Client Driver “WINSOCK.
VNETWARE.386 11/19/93 VIPX.386 01/19/94 1.04 1.13 NWCALLS.DLL 11/02/93 4.04 NWIPXSPX.DLL 11/02/93 4.04 Trouble Unable to login to NetWare. Console Message “WINRPC: Connection was refused” SnapBack Console will not see any SnapBack Servers if Legato Backup Director or NetWare/IP is installed. RPCNET.CFG is used by many programs and is inadvertently overwritten by other vendor’s install programs. SnapBack Install will NOT overwrite this file and uses the current configuration.
SnapBack DOS: Various Out of Memory Conditions. • • SnapBack DOS says “Incorrect block size e0200000” when at start or restore. When doing a disaster image restore from SNAPBACK/ DOS you may need to modify the block size of the tape. This should only be necessary when the tape’s Block Size has been changed in the SnapBack Configuration or automatically when the backup was made. The block size used on the backup will be recorded in the SnapBack log file.
capacity is wrong. Find out the drive manufacturer and model number. Look in the manual for transfer rates using various tape sizes. Go to the manufacturer’s web site. You can search for manufacturers at: http://www.cdp.com/so Trouble or http://www.cdp.com/Drives.htm • Check the tape format. When writing to old tapes the drive writes at the older rate and capacity. An HP DDS-3 tape drive backs up to a DDS-3 125m tape at 2MB/S and stores 12 to 24GB per tape.
• Replace the SCSI Cable. Cables do go bad, are poorly manufactured, and can be too long. Longer cables are susceptible to interference. • If the drive supports hardware compression, enable it. If the transfer rate is still under the rating, try toggling the compression (if ‘on’, turn it off; if ‘off’, turn it on). Some tape drives will write data to the tape requiring more space after compression. This can reduce the capacity of a 4/8GB tape to 3GB or less.
Backup Problems The server hard disk must be completely idle before the backup can begin. By default SnapBack waits for 15 seconds of inactivity. Many programs running on the file server access the hard disk on a regular basis. Novell’s Mail Handling System is an example of this type of program. You can reduce the amount of time that SnapBack waits for no disk activity by using the Console program. A wait time of less than five seconds may cause an invalid backup.
Appendix A— SCSI Compatibility SCSI Host Adapters Any SCSI host adapter with an ASPI, CAM, or SDLP Manager should work with SnapBack. The following is a partial list of SCSI Host Adapters known to be compatible with SnapBack.
SSTSDLP1.SYS
Tape Drives Any SCSI tape drive should work with SnapBack.
Conner/Seagate Exabyte Tandberg TRAVAN AIWA HP Tecmar MLR SLR DLT Tandberg Cipher DEC Quantum SGI Autoload Changer Libraries ADIC HP SnapBack Live! CTMS-3200 Anaconda Archive Viper EXB-2501c EXB-2501 EXB-2502c EXB-2502 TDC 3500 TDC 3700 TDC 3800 TDC 4100 TDC 4200 TDC 4220 TDC 4222 TDC 6100 TD-8001 T4000 T4i T4e NS20 NS8 MLR SLR T826s L860s DLT-2000 TZ87 TZ88 TLZ06 DLT 2000 DLT 4000 DLT 7000 DLT 2000 DLT 4000 Scaler DLT 448 (Faststor FSFastStor DLT 4000 C1557A C1557 C1553 C6280 (418) C5173-7000 (71
DEC SGI Quantum Exabyte SnapBack Live! C1194F (4228,4248,4448) DLT 2700 DLT 2700 DLT 4700 DLT 2700 DLT 4700 DLT 2500 DLT 4500 EXB-10I EXB-10E EXB-10H EXB-120 EXB-160 EXB-210 EXB-220 EXB-440 EXB-480 EXB-218 EXB-018 EXB-18D 143
Appendix B— Technical Support Contacting Technical Support Free technical support is available weekdays from 9:00am to 5:00pm. You may contact technical support via voice, FAX, Email, or the World Wide Web. +44 (0)1253 780044 Fax +44 (0)1253 782879 Email Technical@snapback.co.uk WWW Site http://www.snapback.co.uk Preparing to Call The support staff will be better able to assist you if you are prepared for the call.
Glossary ANSI - American National Standards Institute - An organization for the development and publication of standards such as computer interfaces. ASPI - Advanced SCSI Programming Interface - An interface that enables a SCSI host adapter to handle communication between applications and SCSI devices. AUTOEXEC.NCF - NetWare batch file for loading device drivers or other programs during server startup.
COMPRESSION - Encoding of data to take up less storage space. DASD - Direct Access Storage Device - A storage device which allows direct access to any location on the media without traversing all intermediate locations. A hard drive is DASD, a tape drive is not. DAT - Digital Auto Tape - A high capacity magnetic tape digital recording technology originally developed for high fidelity audio. DEVICE - A hardware peripheral connected to a computer system. Tape drives and hard disks are devices.
MEGABYTE - MB, Meg - 1,048,576 bytes or characters (a kilobyte squared). Typically used to measure file, device, and memory sizes. MIRRORING - Writing duplicate data to two or more devices simultaneously. NLM - NetWare Loadable Module - A program that enhances or provides additional server functions in a NetWare 386 server. PARTITION - A logical subdivision or section of a disk drive. ROM - Read Only Memory – Computer memory that stores unchanging programs or data.
BYTE, 148 A Abort, 43, 67, 83 Active X, 11 Alien System, 14 ANSI, 148, 150 ASPI, 87, 92, 129, 139, 148 AUTOEXEC.
DOS, 54, 81, 102, 103, 117, 120, 134, 135, 138, 149 backup from, 14 rescue disk, 31 restore from, 14 Restore from, 12 Support, 14 Downed Server Backup, 15 E ERRORS, 51, 77 F FDISK, 83, 149 File by File Backup Problems, 11 FILE SERVER, 149 File Server Name, 120 files limitations, 15 FORMAT, 120 G Getting Started SnapBack, 16 H Host Adapter, 139 HOST ADAPTER, 149 I IDE, 149 image SnapBack Live! backup limitations, 15 Image Backup, 12 INSTALL, 83, 120 Interface, 103, 148, 150 Internet/None, 36, 37, 60, 6
NLM Management, 81 Open transaction processing, 17 Server, 17 Server Installation, 29 New Volume, 121 NLM, 91, 120, 122, 123, 127, 128, 150 O open transaction processing, 16 optimal, 52, 79 original, 82, 83 OS/2, 15 P partitions, 40, 64, 116, 120 limitations, 15 Performance Backup, 12 Product Name, 103 R rescue disk, 31 Rescue disk and alien systems, 14 automatic execution, 14 Rescue Disk Building, 31 RESIZE.
SnapBack Console, 35, 38, 42, 43, 52, 59, 62, 66, 67, 78, 128, 134, 146 SNAPBACK.EXE, 135 SNAPSCAN.EXE, 102 STATUS, 43, 67 STREAMS.NLM, 127 T TAPE, 46, 70, 118 Tape Drives, 40, 64 Tape Status, 43, 67 Target, 103 TDROM, 55, 75, 76, 81, 97, 117, 132 Transfer Rate Status, 44, 68 Transfer Size, 53, 79 SnapBack Live! U Unit Number, 103, 149 Unix, 15 V VIEW, 88 W WASH.
