TMF Operations and Recovery Guide (G06.26+)

Occasional Operations
HP NonStop TMF Operations and Recovery Guide—522417-003
3-8
The ALTER AUDITTRAIL Command
In the following example, the files per active-audit volume are increased to 6 in the
MAT configuration:
TMF 21> ALTER AUDITTRAIL MAT, FILESPERVOLUME 6
Adding Another Active-Audit Volume
Adding an active-audit volume increases the audit tail capacity by the number of files
configured to reside on each volume of an audit trail; if there is not enough disk space
for these files, the volume cannot be added.
If the active-audit volume is full, add another active-audit volume. In the following
example, a new volume, $AUD2, is added as an active-audit volume:
TMF 27> ALTER AUDITTRAIL MAT, ADDACTIVEVOL $AUD2
The ALTER AUDITTRAIL command can be issued only by members of the super user
group. See the TMF Reference Manual for instructions on using the ALTER
AUDITTRAIL command.
Using ALTER AUDITTRAIL with RDF/ZLT
The HP NonStop™ Remote Database Facility subsystem that guarantees Zero Lost
Transactions (RDF/ZLT) protects customers who cannot risk the loss of even a single
transaction during RDF takeover. The ZLT capability guarantees that, if an outage
occurs, all transactions written to the audit trails on the source (primary) system will be
available on the remote (backup) system as well. Through the ZLT capability, no
transactions committed on the primary system are lost in the event of an RDF takeover
on the backup system.
Normally, if some or all of the resources needed to ensure ZLT on the backup system
become unavailable, transactions are nonetheless completed (committed or aborted)
on the primary system. In such a case, some transactions might not be copied to the
backup system and ZLT would not be fully achieved. However, by issuing the ALTER
AUDITTRAIL command with the COMMITHOLDMODE and COMMITHOLDTIMER
options, you can direct TMF to defer transaction commit or abort on the primary system
Note. TMF is shipped from the factory with the $AUDIT disk volume configured as the active-
audit volume. You are free to retain $AUDIT for this purpose, replace $AUDIT with another
volume as the recipient of audit trails, or add other active-audit volumes to the configuration.
See also the information about the preconfiguration of data volumes under Adding New
Data Volumes on page 3-11.
Note. To delete an entire audit trail, you must delete the TMF configuration and reconfigure
audit trails from the beginning. Deleting the TMF configuration clears current transaction
information, the data volume configuration, and the TMF catalog. See the TMF Planning and
Configuration Guide for information on these operations.