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

TMF Reference Manual
HP NonStop TMF Supplement for Large Audit-Trail Files—527391-001
5-24
ALTER TMF (Pages 3-94 through 3-95)
generally required only once, because the format change is typically a one-time
operation done only to move from format 1 to format 2 files.
The new file format takes effect immediately in the configuration, but format 2 files are
only created as audit-trail files are renamed forward during audit-trail rollover. During
the subsequent START TMF operation, TMF forces rollover of each configured audit
trail. In many cases, the next audit-trail file used for a specific audit trail will be a
format 2 file. But if an audit-trail file in the prepared state exists in this audit trail, the
next file may still be a format 1 file. Nevertheless, for all later rollovers, TMF will create
format 2 files and will purge the old format 1 files.
Always keep in mind that the ATFORMAT value applies to your entire TMF
configuration, while the FILESIZE value specified in an ADD AUDITTRAIL or ALTER
AUDITTRAIL command applies to the particular audit trail identified in that command.
Examples
This ALTER TMF command changes the configuration volume from $SYSTEM to
$CAT01:
TMF 76> ALTER TMF, CONFIGVOL $CAT01
The following command switches the primary and backup TMP processes:
TMF 77> ALTER TMF, SWITCHPROCESS TMP
The following command moves from format 1 to format 2 audit-trail files; the transition
will take place when you restart TMF:
TMF 77> ALTER TMF, ATFORMAT 2
Caution. Changing from format 1 to format 2 audit-trail files may make falling back to an
earlier TMF RVU difficult; prior TMF releases cannot read format 2 audit-trail files. Thus, you
should not move to format 2 files until you are confident of the stability of this RVU in your
system environment. Once format 2 files are in use, if problems occur, you may need to delete
your TMF configuration to fall back to an earlier RVU that does not support format 2 files.
To use the ATFORMAT option, you must first stop TMF cleanly; otherwise, you cannot alter the
audit-trail file format. A clean stop provides a stable point to which you can recover should you
need to fall back to your previous format. If you have stopped TMF with the STOP TMF,
ABRUPT command, you cannot issue the ALTER TMF, ATFORMAT command with successful
results.
For more information, see the discussion of fallback considerations in Section 3, TMF Planning
and Configuration Guide.