TMF Introduction (G06.26+)

TMF System Management
HP NonStop TMF Introduction—522414-002
6-6
Managing Audit and Online Dumps
When audit compression is used, programs cannot use audit-reading routines as
easily. These routines have more difficulty reading the audit trails because of the
decompressing work involved.
Audit compression is controlled on a file-by-file basis for database files with the
AUDITCOMPRESS file attribute.
Managing Audit and Online Dumps
When an audit trail is configured to have an audit dump process, audit dumps are
created automatically, as needed. Online dumps can be initiated without operator
intervention by running system management programs that use SPI, or by using TACL
programs.
Monitoring TMF
To maintain TMF, you should monitor it each day. You can use TMFCOM to view the
status of the different components of TMF.
Managing the TMF Catalog
The TMF catalog is a set of files residing on the same mirrored disk volume as the
TMF control files. The catalog contains two types of control information: a dump
directory and a media directory. This information is required for file recovery.
The dump directory includes a history of each file that was dumped, including the time
and date when it was copied. This directory includes:
•
The names of the dumped files, and the names of the tape drives used to dump
the files, if tape is used
•
A timestamp and unique serial number for each dump
•
The copy number of each dump (because multiple copies can be made for each
generation, the copy number identifies each distinct copy of a particular version)
•
The sequence number of the audit-trail file in use at the time of each online dump
The media directory contains all known tape-reel identifiers and their current status:
scratch, released, bad, or assigned to a particular dump’s serial number.
As an online or audit dump progresses, the TMF catalog process writes the necessary
information to the catalog in a fail-safe manner. The file recovery process uses this
cataloged information to determine which tapes or disk files are required for recovery
operations.
More information about TMF system management appears in TMF Planning and
Configuration Guide and TMF Operations and Recovery Guide.