RDF/IMP and IMPX System Management Manual (RDF 1.4+)

Preparing the RDF Environment
HP NonStop RDF/IMP and IMPX System Management Manual—524388-001
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Preparing Databases for RDF Protection
pinned on behalf of the RDF extractor even if you stop RDF. Audit trail pinning is lost if
you stop TMF. See also the description of the UNPINAUDIT command in section 8.
You can control when TMF dumps an audit trail by configuring TMF for dump to tape.
For example, when configured with a tape dump process, TMF issues a prompt for the
operator to mount a tape when TMF is ready to dump and purge an old audit trail file.
Because TMF cannot execute the dump and purge of the audit trail file until a tape is
mounted, the operator can wait until the RDF extractor finishes that file before
mounting the tape.
For more information on configuring TMF, see the HP NonStop Transaction
Management Facility (TMF) Planning and Configuration Guide.
TMF Configuration Without Dump Process
Long ago, the RDF product required that you configure TMF with a dump process that
dumps to tape. RDF no longer imposes this requirement on either the primary or
backup systems, however, for the following reasons:
1. On the primary system, the RDF extractor explicitly pins the audit trail it is currently
processing, thereby preventing TMF from purging it. This explicit pinning remains
in effect even if the extractor process fails or RDF is shut down.
If you must unpin one or more audit trail files, you can do so by issuing an
UNPINAUDIT command. Later, when RDF is restarted, you can restore the
necessary audit trail files from tape.
2. TMF includes the functional capability of audit overflow volumes. You should
always configure them with at least one overflow audit volume.
3. If you are required to do a takeover, it is recommended that you take online dumps
of the backup database before restarting the applications that will use it.
Preparing Databases for RDF Protection
When preparing databases on the primary system for RDF protection, you must
consider the following system aspects:
•
Copies of files for the backup database
•
Copies of NonStop SQL views on the backup systems
•
Placement of partitioned Enscribe files and NonStop SQL tables
Caution. Although RDF no longer requires you to configure TMF with a dump process that
dumps to tape, you should nevertheless configure TMF for dumping to tape if you want to
achieve full TMF protection for your primary database. In addition, if the RDF extractor is
running behind and you stop the TMF and RDF subsystems before RDF has caught up to the
TMF shutdown point, when you subsequently restart TMF, the TMP might roll over the files
before the RDF extractor can process them.