Open System Services Management and Operations Guide (G06.29+, H06.07+)

Managing OSS Files
Open System Services Management and Operations Guide—527191-005
6-21
Backing Up User Files
Creating a pax Backup of OSS Files in the Guardian File
System
If the output of a pax backup is less than 8 gigabytes (for H06.06 and later RVUs) or
less than 2 gigabytes (for RVUs prior to H06.06), you can create the backup in the
Guardian file system. If a fileset backup requires more than the size limit of a pax
archive file, you can either:
•
Back up sections of the fileset (each section must be smaller than the size limit of a
pax archive file).
•
Compress the pax archive file. However, a compressed pax archive file can only
be restored from an OSS shell; the PINSTALL command cannot correctly process
a compressed pax archive.
To determine the size of the backup for an OSS fileset, assume that the backup
requires as much space as the fileset itself.
To determine the size of the HOME fileset, for example:
1. Determine the subvolume name of the fileset by obtaining its DEVICELABEL value
from the fileset definition. The last five digits in the Guardian subvolume name
(which begins with ZYQ) correspond to the DEVICELABEL value.
For the HOME fileset in this example, the DEVICELABEL is 000001, so this
fileset’s subvolume name is ZYQ00001.
2. Use the following form of the TACL DSAP command to determine the size of the
fileset:
DSAP oss_volume_name, BYSUBVOL
You need to do this for all volumes that contain files with the subvolume name for
the fileset. To determine the list of volumes with subvolumes, you can use the
command:
FUP SUBVOLS $*.ZYQnnnnn
For the HOME fileset example, the commands would be:
FUP SUBVOLS $*.ZYQ00001
If the output of this SUBVOLS command was:
$OSS2
ZYQ00001
$OSS1
ZYQ00001
$OSS
ZYQ00001
then the corresponding DSAP commands would be:
DSAP $OSS2, BYSUBVOL
DSAP $OSS1, BYSUBVOL
DSAP $OSS, BYSUBVOL