TMF Planning and Configuration Guide (G06.24+)

Reconfiguring Audit Trails

HP NonStop TMF Planning and Configuration Guide—522416-004

3-4

Number of Active-Audit Volumes

An active-audit volume is a disk volume configured to contain active audit-trail files. An

active-audit volume cannot also be configured as a data volume.

For G-series releases only, the TMF product 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 for G-series releases, under Adding Data

Volumes on page 2-4.

How Multiple Active-Audit Volumes Are Used

You can add or delete active-audit volumes while transaction processing is in progress.

If you configure more than one active-audit volume for an audit trail, they are used in

alternating sequence for storing audit-trail files. For example, if you configure two

active-audit volumes named $A and $B, the first audit-trail file will be stored on volume

$A, the second on volume $B, the third on volume $A, and so forth. This method of

disk usage ensures that, under normal circumstances, the audit dump process reads

from a different physical disk drive than the one containing the current audit-trail file,

thereby avoiding disk head contention and excessive seeks.

Adding Active-Audit Volumes

Adding an active-audit volume increases the audit-trail 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.

Deleting Active-Audit Volumes

Deleting an active-audit volume decreases the audit-trail capacity by the number of

files configured to reside on each volume of an audit trail. For at least a week, keep a

record of the level of audit-trail capacity used before deleting an active-audit volume.

Make sure that decreasing the audit-trail capacity will not cause frequent overflow

conditions.

If you delete a volume that contains files needed by a TMF process, the volume

remains in the configuration until it has no active audit-trail files. No further audit

records are written to this volume, and any preallocated files on the volume are

deleted.

Note. If you wish to increase the capacity of an audit trail by adding an active-audit volume,

first check that the need for additional capacity is not caused by a too-low setting of the

overflow threshold, as described in Changing the Overflow Threshold on page 3-8.

Note. To delete an active-audit volume, you must have more than one active-audit volume

configured. If you have only one active-audit volume, you cannot delete it, and an explicit

rollover always rolls over to the same volume.