TMF Planning and Configuration Guide (G06.26+)

Configuring TMF for Backup and Recovery

HP NonStop TMF Planning and Configuration Guide—522416-005

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Recovery Planning for Catastrophic Failures

The subsections that follow describe how to plan for recovery from catastrophic

hardware losses. The actual recovery procedures are described in the TMF

Operations and Recovery Guide.

In a production TMF environment, there are three types of hardware losses from which

there is no automatic recovery or recovery using routine procedures:

1. Loss of the TMF configuration subvolume (ZTMFCONF)

2. Loss of an active-audit volume

3. Loss of the entire system

Loss of ZTMFCONF

If you lose the TMF configuration subvolume (ZTMFCONF), TMF comes to an abrupt

halt. In such a situation, it is more than likely that you have lost the entire volume

(necessitating, in the case of $SYSTEM, a complete system reload). Of particular

significance to your TMF environment, however, is that all audit-trail configuration

information and the TMF catalog are lost.

There are three things you can do to protect yourself against the loss of ZTMFCONF:

1. Use mirrored volumes for the configuration volume.

2. Back up ZTMFCONF periodically.

3. Keep a hard-copy record of all audit dumps and online dumps since the most

recent backup of ZTMFCONF.

The ZTMFCONF subvolume is not a static entity. Most notably, it is the repository for

all audit-trail configuration information. Therefore, if you ever issue an ALTER

AUDITTRAIL command, you should back up the ZTMFCONF subvolume afterward.

The TMF catalog tables also reside in ZTMFCONF. If you must restore that

subvolume, the restored catalog tables will not include entries for any audit dumps or

online dumps that were made after the most recent backup. Therefore, you will have

to add the appropriate dump entries to the catalog manually, after the subvolume has

been restored. To do that, you need hard-copy information about the dumps. You can

maintain that information either manually, in a written log, or by routinely directing the

EMS log to a hard-copy device.

Caution. If both of the mirrored disks on which ZTMFCONF resides become unreadable,

contact your service provider.