Technical data

Using BACKUP
11.15 Backing Up User Disks
How to Perform This Task
If several users are on your system, notify them that a disk backup is about
to take place. If you have the OPER privilege, you can notify users with the
REPLY/ALL command, as follows:
$ REPLY/ALL "System Backup About to Begin -- Open Files Will Not Be Backed Up"
When you enter this command, each interactive terminal on the system displays
the following message:
Reply received on MYNODE from user SYSTEM at VTA28: 23:35:11
System Backup About to Begin -- Open Files Will Not Be Backed Up
11.15.2 Performing Image Backups to Tape
As described in Section 11.2, an image backup of a disk provides you with an
exact logical copy of all the files on the disk. You should perform image backups
with no interactive users on the system because of open file considerations
(described in Section 11.15.1). Also, system performance can be affected during
the backup process, so it is best to schedule the backup during the least busy
times for your system. You can optimize the speed of the backup procedure
by ensuring that certain process and system parameters are set properly (as
described in Section 11.7).
How to Perform This Task
To perform an image backup, use the BACKUP command in the following format:
BACKUP/IMAGE [/RECORD] input-device output-specifier [/LABEL=label] [/REWIND]
The /IMAGE qualifier identifies the backup operation as an image backup. The
/RECORD qualifier is optional and records the current date and time in the file
header record of each file that is backed up. You must use the /RECORD qualifier
if you are planning to perform future incremental backups. Specify the name of
the disk you are backing up as the input-device; do not specify individual files.
The /REWIND qualifier is optional depending on whether you want to initialize
the tape. The /LABEL qualifier identifies the label of the tape.
Examples
1. The following example shows how to create an image backup of a disk on
your workstation. If the disk is named DKA100:, and the tape cartridge drive
is named MKB100:, you could perform the image backup by entering the
following commands:
$ INITIALIZE MKB100: WKLY !
$ MOUNT DKA100: DISK$1 "
%MOUNT-I-MOUNTED, DISK$1 mounted on _DKA100:
$ BACKUP/IMAGE/RECORD/VERIFY
_From: DKA100:
_To: MKB100:FULL02.SAV/LABEL=WKLY #
%BACKUP-I-STARTVERIFY, starting verification pass
In this example, the individual commands perform the following actions:
! Initialize the tape in MKB100: with the label WKLY.
" Mount the disk DKA100: (BACKUP will mount the tape drive).
# Back up the disk DKA100: to the save set FULL02.SAV on MKB100. The
/IMAGE qualifier indicates that this is an image backup. The /RECORD
qualifier records the current date and time of the backup in the file
header record of each file that is backed up. The /VERIFY qualifier
Using BACKUP 11–33