Technical data

Using BACKUP
11.17 Backing Up and Restoring the System Disk
To build standalone BACKUP, execute SYS$UPDATE:STABACKIT.COM. The
procedure copies the files for booting standalone BACKUP to a new directory
on the target device that you specify, creating the directory if necessary. When
you build a kit on the system disk, the procedure copies the files to the [SYSE]
directory. When you build the kit on a user disk, the procedure copies the files to
the [SYS0] directory.
How to Perform This Task
Perform the following steps to build standalone BACKUP on a disk:
1. Log in to the SYSTEM account.
2. Enter the following command and press Return:
$ @SYS$UPDATE:STABACKIT
Enter the name of the device on which to build the kit:
3. Enter the device name of the disk that you are building standalone BACKUP
on. If you are building standalone BACKUP on the system disk, enter
SYS$SYSDEVICE. For example:
Enter the name of the device on which to build the kit: SYS$SYSDEVICE:
4. The procedure places the files in the appropriate directories on the disk that
you are using to build standalone BACKUP. It lists the files as they are
copied. When the procedure finishes, it displays the following message:
The kit is complete.
Performing Image Backups from an RF73 Disk
When you perform an image backup from an RF73 disk (or a disk with a cluster
size of 4 blocks) to an RF74 disk (or a disk with a cluster size of 7 blocks), the
Backup utility does not check the file size when it allocates space for the file
being copied. Therefore, if the file has an allocation greater than the value of the
CLUSTER_SIZE attribute established during initialization, BACKUP allocates
one more cluster size number of blocks to the allocation size even though the
actual file size is less than the cluster size. For example, during an image
backup, a file that uses 6 blocks and is allocated 8 blocks (which displays as 6/8
on the screen if you enter a DIRECTORY/SIZE=ALfter it is copied to the target
disk.
As a result of this problem, the following files are copied to the image system disk
with a blocks used/allocation size of 6/14 blocks:
SYS$COMMON:[SYS$LDR]LIDRIVER.EXE
SYS$COMMON:[SYS$LDR]LPDRIVER.EXE
This incorrect allocation size causes standalone BACKUP to fail on the booted
image system disk.
To correct this problem, recopy the two previously listed files to the same directory
after the image backup, by using the following command (which also specifies the
correct allocation size):
$ COPY/ALLOCATION=7 SYS$COMMON:[SYS$LDR]LIDRIVER.EXE
$ COPY/ALLOCATION=7 SYS$COMMON:[SYS$LDR]LPDRIVER.EXE
Using BACKUP 11–55