TMF Supplement for Large Audit Files (G06.24+)

TMF Reference Manual
HP NonStop TMF Supplement for Large Audit-Trail Files—527391-001
5-8
ADD AUDITTRAIL (Pages 3-14 through 3-19)
RESTOREVOL Option Considerations
Restore-audit volumes are used to receive audit-trail files restored from an audit dump
as part of a recovery procedure. You can specify the restore-audit volumes associated
with the audit trail through the RESTOREVOLS parameter.
Configuring an active-audit volume as an overflow- or restore-audit volume might result
in contention for the disk, adversely impacting performance. To avoid this, you should
consider disk capacity, available free space, and probable audit activity when
configuring.
BEGINTRANSDISABLE Option Considerations
Another attribute related to audit trail capacity is the BEGINTRANSDISABLE
parameter. This value indicates the percentage of audit trail capacity that can be
consumed before TMF automatically disables new transactions. This value must be
low enough to ensure that existing transactions have enough room in the active-audit
trail for completion. The appropriate value depends on the transaction load, the
demands of the applications, and other factors prevailing in the system.
Other Operational Considerations
If the primary transaction management process (TMP) fails before the ADD
AUDITTRAIL command completes, the backup TMP takes over and undoes the effects
of that command before processing any new requests from TMFCOM. If both TMPs
fail before the ADD AUDITTRAIL command completes, TMF also undoes the effects of
that command.
If the ADD AUDITTRAIL command returns an error, files that were preallocated when
active volumes were added might not be purged from the volumes; this occurs if the
TMP loses access to these volumes. If you attempt to add these volumes as active
again with another ADD AUDITTRAIL command, the existing files are purged before
the new ones are created.
For more information about master and auxiliary audit trails, overflow volumes, and
restore-audit volumes, see the TMF Operations and Recovery Guide.
Examples
The following ADD AUDITTRAIL command adds a master audit trail using the disk
volumes $MAT1, $MAT2, and $MAT3 for the audit-trail files:
TMF 10> ADD AUDITTRAIL MAT, &
>>>ACTIVEVOLS($MAT1,$MAT2,$MAT3), &
>>>FILESIZE 20, FILESPERVOLUME 3,&
>>>OVERFLOWVOLS($DATA1,$DATA2),&
>>>OVERFLOWTHRESHOLD 80, BEGINTRANSDISABLE 95,&
>>>RESTOREVOLS $DATA1, &
>>>AUDITDUMP ON