Air Cleaner User Manual

does not apply to backups to tape or TSM virtual devices.
Using this option also requires the use of the Media Available
Space and CD/DVD Media Size options.
Non-rootvg Volume Groups to include
Default displays the volume groups previously selected, if any.
You can add or delete volume groups from this list to include
or exclude them from the backup. You can also press F4 to list
the available volume groups and select from the list using F7.
5. After verifying all selections made above, press Enter to begin the backup.
If you selected to back up to tape, the tape block size is automatically changed to
512-byte blocks for writing the boot and installation images on the tape. This is
necessary for the installation process to properly read the tape. After the boot and
installation images are written to the tape, the block size is changed back to the
original value and the remainder of the backup is written.
This process calculates and records certain information about your system
configuration for later use by the installation process. The boot images are then
placed on the tape, followed by each file system or logical volume in the selected
volume groups.
Pre-Backup Script: If you created a custom script to run before the system backup,
it runs first. This script might mail a message to users, remove temporary files,
stop applications, or other similar functions. Refer to Appendix D, “Creating
Scripts for Customizing the System Backup and Install Process”, on page D-1 for
information on creating pre-backup scripts.
Post-Backup Script: If you created a custom script to run after the completion of
the system backup, it runs after the backup is complete and before the tape is
rewound and verified. This script might mail a message to users or re-enable
applications that were disabled prior to the backup starting. Refer to Appendix D,
“Creating Scripts for Customizing the System Backup and Install Process”,on
page D-1 for information on creating post-backup scripts.
Backing up Volume Groups
If your system is organized so that the physical volumes, or hard disks, are placed
into separate volume groups, then you probably want to back up these volume
groups independently, for the following reasons.
First, data in different volume groups might require backups to be performed at
different frequencies. For instance, critical data changed daily should be backed up
at least once daily. Application programs or history files might not change on a
daily basis and might be only backed up on a weekly or monthly basis.
Secondly, the most common hardware failure in any computer system is a hard
disk failure. If a single disk fails within a volume group, you want to replace the
disk and restore only the data in that one volume group. Separately backing up
each volume group enables you to restore only a single volume group without
touching the rest of the data on the system.
You can use the Backup Volume Groups option to back up one or more volume
groups. All file systems and logical volumes in the selected volume groups are
included on the backup unless they are specified in the exclude list.
4-10 IBM Tivoli Storage Manager for System Backup and Recovery: Installation and User’s Guide