TMF Operations and Recovery Guide (G06.24+)

Recovery Methods
HP NonStop TMF Operations and Recovery Guide—522417-002
7-20
Recovering Audit-Trail Files Dumped to Disk
Remember: MAXRETAINEDATFILES optimizes access time for files archived on tape;
RESET MAXRETAINEDATFILES maximizes available disk space.
Recovering Audit-Trail Files Dumped to Disk
For audit-trail files dumped to disk, TMF opens the disk dumps directly, rather than
copying them to a restore-audit volume. This operation is automatic for all recoveries
involving audit-trail dumps on disk. Because the restore time used for audit-trail dumps
on tape is entirely eliminated for dumps on disk, a recovery process never needs to
wait for audit-trail files to become available. (For this reason, the
MAXRETAINEDATFILES option in the ALTER AUDITTRAIL command does not apply
to dumps on disk.)
Recovery Scenarios
This section suggests actions you can take to prevent the most common problems that
occur on TMF systems. It also describes how to recover from these problems with
minimal interruption to system operations.
Preventive Maintenance
Recovering from certain problems on your TMF system can be greatly simplified if you
perform the following tasks:
•
Make online dumps to tape at least once a week; make two copies (if the only copy
becomes unusable, file recovery may be impossible).
•
Make audit dumps to tape as needed; make two copies (if the only copy becomes
unusable, file recovery may be impossible).
•
Perform the following tasks once daily:
•
Make a command file for re-creating each online and audit dump entry
recorded in the TMF catalog. Use the following TMFCOM command to create
the command file:
TMF 36> INFO /OUT filename / DUMPS *.*.*, OBEYFORM, &
>>>SERIAL serial-number
•
Back up the TMF configuration subvolume, whose location is listed in the
$SYSTEM.ZTMFCONF.CONFVOL file. The default location is
$SYSTEM.ZTMFCONF. If your system uses a subvolume other than the
default, be sure to back up the file $SYSTEM.ZTMFCONF.CONFVOL as well.
•
Run the Disk Space Analysis Program (DSAP) to obtain a hardcopy listing with
the following information for all disk volumes on the system: available space,
broken files, and redo-needed files. Use this command to generate the report:
> DSAP $*, BROKEN, ROLLFORWARD