RDF System Management Manual

Entering RDFCOM Commands
HP NonStop RDF System Management Manual—524388-003
8-21
Command Overview
RDF State Requirement
After RDF is initialized, you can issue a DELETE command only when RDF is stopped.
Usage Guidelines
For the DELETE command to have any effect, a configuration record must already
exist for the secondary image trail or updater process associated with the volume
name supplied (that is, someone must have previously issued an ADD IMAGETRAIL
or ADD VOLUME command for the volume).
When you issue a DELETE VOLUME command, RDF responds as follows:
•
The extractor process stops sending image data for the volume specified in the
DELETE VOLUME command.
•
The updater process associated with this volume will not be started.
Use the DELETE VOLUME command if an update volume on the backup system
becomes unusable and you want RDF to continue maintaining the other volumes. In
such a case, you must stop RDF at the primary system, issue the DELETE VOLUME
command, and then restart RDF.
When it is convenient to do so, you can resynchronize the affected volume, configure a
new updater process by issuing appropriate SET VOLUME commands, and then issue
an ADD VOLUME command to restart RDF protection for the affected primary volume.
Before you can remove an image trail with the DELETE IMAGETRAIL command, you
must delete all updater processes that are configured to that image trail. The DELETE
IMAGETRAIL command then deletes the configuration record for the image trail and all
image files currently belonging to that trail. Thus, the network connection to the
backup system must be available when you enter this command.
If you need to change an updater’s image trail volume, it is recommended that you
stop TMF; wait for RDF to stop; delete the volume; re-add the volume back into the
configuration, associating it to a different image trail volume; and then restart the TMF
and RDF subsystems. This is the only way to ensure that the backup database will
remain synchronized with the primary database.
Examples
Assume that RDF is protecting primary system data volumes $DATA01, $DATA02, and
$DATA03, and that all three volumes are configured to the MAT. Assume also that the
changes are being replicated to backup system volumes $DATA1, $DATA2, and
$DATA3, and that the updaters for those volumes are acquiring their audit data from
secondary image trail volumes $SECIT1, $SECIT2, and $SECIT3, respectively.
To delete the configuration records for the updater process and secondary image trail
associated with $DATA03, enter the following commands:
]DELETE VOLUME $DATA03
]DELETE IMAGETRAIL $SECIT3