RDF/IMP and IMPX System Management Manual (RDF 1.3+)

Online Database Synchronization
Compaq NonStop™ RDF/IMP and IMPX System Management Manual—522204-001
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Other RDFCOM Commands
Other RDFCOM Commands
The following RDFCOM commands support the online synchronization functionality:
•
SET VOLUME
•
SHOW
•
RESET
•
INFO
•
STATUS RDF
The SET VOLUME command accepts the SYNCH parameter, allowing you to add a
volume back into the RDF configuration as part of a partial online synchronization.
If the SYNCH parameter has been set for a volume, the output display for the SHOW
VOLUME command includes VOLUME SYNCH for that volume (otherwise that
designation is omitted from the display).
The RESET command restores the SYNCH parameter in the configuration memory
table for the specified updater to its default value (off).
If the SYNCH parameter has been set for a volume, the output display for the INFO
VOLUME command includes VOLUME SYNCH for the updater associated with the
specified volume. If a volume is in synchronization mode, the SYNCH flag is turned off
when the extractor generates the synch-complete image record and the record has been
successfully written to the image trail. Thus, the INFO VOLUME command display
only reflects the synchronization status of the updater with respect to audit activity on
the primary system. Actual synchronization of the volume on the backup system does
not complete until the updater reaches the synch-complete image record in the image
trail and logs a message 782. Consequently, just because the INFO VOLUME display
shows the synchronization status of a volume as false (omits VOLUME SYNCH from
the display), the volume may not yet be completely synchronized. To ascertain when the
volume is actually synchronized, look for the updater’s synch-complete message on the
backup system or periodically check the STATUS RDF display with regard to the
particular updater.
The updater portion of the STATUS RDF command output display specifies if the
associated volume is in synchronization mode by including VOLUME SYNCH
(otherwise that designation is omitted from the display).