Open System Services Management and Operations Guide (G06.25+, H06.03+)

Managing OSS Files
Open System Services Management and Operations Guide—527191-002
6-22
Backing Up OSS Files to Other Expand Nodes
In Figure 6-4, the total number of pages for the HOME fileset is shown as 485776.
Multiplied by 2048, the total size of the HOME fileset would be 994,869,248 bytes if
it is completely contained on this one disk. Because this is smaller than the 2-GB
limit, the HOME fileset can be backed up in the Guardian file system.
For more information about the DSAP command, see the Guardian Disk and Tape
Utilities Reference Manual.
To create the backup for the OSS files in the HOME fileset as a file in the Guardian file
system, enter the following OSS shell command:
pax -X -wvf /G/oss/backup/paxhome /home
This command creates the pax archive as the Guardian file
$OSS.BACKUP.PAXHOME on the local NonStop server node. The -X flag prevents
the pax utility from descending into directories within /home when those directories
reside in a different fileset (as indicated by the use of a different device ID from that
used for files in /home that are part of the HOME fileset).
If the HOME fileset had been slightly larger than the 2-GB limit, the following OSS shell
command might also have succeeded:
pax -X -wv /home | compress > /G/oss/backup/paxhome
The amount of data beyond the 2-GB limit that can be backed up in this manner
depends on the contents of the files within the fileset.
Backing Up OSS Files to Other Expand Nodes
You can perform a remote backup of OSS files indirectly by using the pax utility and
writing the backup archive to a directory within the Guardian file system (a directory
within/G), where the archive file is a Guardian file. See Creating a pax Backup of OSS
Files in the Guardian File System on page 6-20 for more information on creating a
backup archive in a /G directory.
Once the pax archive exists in the Guardian file system, you use the T9074 Guardian
BACKUP command to copy the archive file to a remote tape. For information about the
BACKUP command, see the Guardian User’s Guide.
OSS Files and Backup/Restore Utilities (T9074)
OSS files should not be backed up or restored with the T9074 Backup/Restore utilities.
The T9074 Guardian BACKUP utility cannot back up OSS files in file mode, only in
volume mode. Volume mode BACKUP and T9074 volume mode RESTORE work
properly only when all of the following conditions are true:
•
All disk volumes containing OSS files can be shut down to allow the backup.
•
Related OSS catalog and data disk volumes can be down at the same time.
•
The operating system RVU on the system to be restored (the target system) is the
same as on the system being backed up (the source system).