TMF Reference Manual (G06.24+)

TMFCOM Commands
HP NonStop TMF Reference Manual—522418-002
3-132
DUMP FILES
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If no dump medium is specified (that is, if neither TAPEMEDIA nor DISKMEDIA is
included) in the DUMP FILES command, tape media is assumed by default; TMF
searches the TMF catalog for the first tape volume listed with SCRATCH status
and requests the operator to mount that volume. The operator can respond by
mounting that volume, or can select another TMF scratch tape volume defined in
the TMF catalog.
If you specify TAPEMEDIA in the DUMP FILES command, you must not also specify
the DISKMEDIA option.
The more frequently you make online dumps, the fewer the number of tape volumes
needed to store audit dumps.
Specifying two copies of an online dump is recommended for dumping to tape. By
using the SYSTEM (node, node) and COPIES 2 PARALLEL parameter constructs,
you can produce parallel dumps on two nodes (one copy per node). Both nodes can
be remote nodes, or one can be a remote node and the other your local node. All reels
of a specific copy (Copy 1 or Copy 2), however, must be made on the same node.
If you specify COPIES 1, specifying RETAINDEPTH 3 (or higher) in the ALTER
CATALOG command is recommended. If you specify COPIES 2, specifying
RETAINDEPTH 2 (or higher) in the ALTER CATALOG command is recommended.
Even if none of the copies of the online dump can be read, you can use an earlier
dump generation for file recovery.
If the first tape mounted in response to a tape-mount request is write-protected, TMF
does not invoke the automatic volume-recognition (AVR) feature with successive
tapes. This is particularly troublesome when multiple TMF scratch tapes have been
pre-mounted on a multi-tape device; in such a case, all remaining scratch tapes will be
rejected and unloaded. Always verify that pre-mounted TMF scratch tapes are not
write-protected.
If TMF encounters an error when writing a dump to tape, the tape’s status in the TMF
catalog is changed from SCRATCH to RELEASED regardless of whether the
RELEASED parameter for the catalog is set to ON or OFF. RELEASED status
indicates that something may be wrong with the tape and helps prevent operators from
repeatedly mounting a bad tape.
Output Displayed
When the DUMP FILES command is executed, TMFCOM displays an online report
that includes the items listed in Table 3-3.