TMF Operations and Recovery Guide (G06.24+)

Routine Maintenance
HP NonStop TMF Operations and Recovery Guide—522417-002
2-7
Initiating an Audit-Trail File Rollover
There are two main disadvantages to using the UNPINAUDIT command: first, it
requires stopping RDF, thus removing substantial database protection until the
subsystem is restarted; second, it risks the need for database resynchronization, which
can involve substantial time and effort. Therefore, you might want to consider other
alternatives, such as:
•
Using the TMFCOM ALTER CATALOG command to increase the RETAINDEPTH
value for the TMF catalog. This action keeps the audit dumps available online for a
longer duration. A disadvantage, however, is that it allows the content of the
catalog to expand, consuming resources and potentially degrading performance
when TMF performs catalog operations.
•
Suspending the generation of online dumps. This action, like changing the
RETAINDEPTH value, keeps audit dumps available online longer. However,
subsequent RECOVER FILES operations must then process more files, again
affecting TMF performance.
For more information about the RDFCOM UNPINAUDIT command, see the RDF/IMP,
IMPX, and ZLT System Management Manual.
Reason: Required by the MAT
Meaning. A master audit-trail file that must remain on the active or overflow-audit
volume contains references to audit records in this audit-trail file. This reason applies
only to files in an auxiliary audit trail.
Action. Check the status of the MAT to see why audit-trail files are not becoming
available. Perform the maintenance needed to release the file.
Reason: Volume is down
Meaning. The volume on which the audit-trail file resides is down, so TMF cannot
perform the operation needed to release the file.
Action. Perform the maintenance needed to bring the volume back online.
Initiating an Audit-Trail File Rollover
TMF normally begins writing audit records to a new active audit-trail file when the
current file becomes full. This activity is known as a “rollover.” You can use the NEXT
AUDITTRAIL command to cause an audit-trail file rollover at any time. When you
issue the NEXT AUDITTRAIL command, auditing to the current audit-trail file stops and
the next available audit-trail file becomes the current audit-trail file.
The NEXT AUDITTRAIL command can be issued only by members of the super user
group.