TMF Operations and Recovery Guide (G06.24+)

Occasional Operations
HP NonStop TMF Operations and Recovery Guide—522417-002
3-7
Responding to Capacity-Based Transaction Aborts
Recovery Mode on page 3-11 for more information on using archive recovery mode.
If, however, there has been a sudden burst of audit information generated, or if there is
a permanent increase in the audit generation rate, consider increasing the size of the
audit trail or increasing the overflow threshold.
Responding to Capacity-Based Transaction Aborts
Meaning. TMF aborts any transaction pinning the oldest MAT file if the file is pinned
due to currently active transactions and audit information is filling 45% or more of the
MAT capacity. If TMF aborts a transaction for this reason, it issues an EMS event
message 289, specifying the identifier of the aborted transaction.
Action. If the aborted transaction is a normal transaction that requires additional audit-
trail space to complete, temporarily increase the size of the audit trail. When the
additional audit-trail space is no longer needed, reduce the audit trail to its original size.
Instructions for altering the audit-trail size appear in The ALTER AUDITTRAIL
Command discussion, which follows next.
The ALTER AUDITTRAIL Command
If, as you monitor audit-trail capacity, you detect that the audit trail is consistently
exceeding the overflow threshold, or if a transaction requires additional audit-trail
space to complete, you should increase the capacity of the audit trail. Use the ALTER
AUDITTRAIL command to do one of the following:
•
Increase the number of audit-trail files on the active-audit volume
•
Add another active-audit volume
Another feature of the ALTER AUDITTRAIL command allows you to improve
performance by keeping audit-trail files restored from tape on restore-audit volumes
indefinitely, rather than allowing TMF to purge them automatically when they are no
longer needed. For information about this feature, see Retaining Audit Files Restored
from Tape on Restore-Audit Volumes on page 7-19.
Adding Audit-Trail Files
Increasing the number of files that reside on each active-audit volume is the
recommended way to increase audit-trail capacity. Increasing the files per active-audit
volume causes TMF to create preallocated files on each active-audit volume in the
specified audit trail; if there is not enough space for these files, the number of files per
volume does not change.
If you know there is more room on the active-audit volume, increase the value of the
FILESPERVOLUME parameter.
Note. Before increasing audit-trail capacity, consider the possibility that the overflow threshold
has been set too low.