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

Managing RDF
HP NonStop RDF/IMP and IMPX System Management Manual—524388-001
5-14
Stopping RDF From the Backup System
When you issue a STOP RDF command from the primary system, the following events
occur:
1. RDFCOM sends a STOP message to the monitor.
2. The monitor sends stop messages to the extractor(s), the receiver(s), the purger,
the updater(s), and, if there is an RDF network, the RDFNET process.
3. The monitor stops after all RDF processes have stopped.
If the communications lines between the two systems are down when you issue the
STOP RDF command, the monitor tells the extractor to stop and writes an error
message for every process running on the backup system that the monitor could not
access; the monitor then stops itself. If this situation occurs, you must use RDFCOM
on the backup system to stop the remaining RDF processes before you can restart
RDF.
Stopping RDF From the Backup System
If you issue a STOP RDF command on the primary system when the communications
lines are down, then you must also do so on the backup system. That is the only time
you should ever issue a STOP RDF command on the backup system.
RDF can recover from a communications line failure, as explained under Responding
to Operational Failures earlier in this section.
When you issue a STOP RDF command on the backup system, RDFCOM attempts to
contact the RDF monitor on the primary system. After discovering that the monitor is
not accessible, RDFCOM sends individual stop messages to all RDF processes on the
backup system.
If RDFCOM can contact the monitor on the primary system, the STOP RDF command
is aborted.
To stop the RDF processes on the backup system, RDFCOM must be able to locate
the RDF control subvolume (whose name is the same as that of the control subvolume
on the primary system). You must explicitly specify the control subvolume name when
you start the RDFCOM session. For example, if the associated primary system is
named \DALLAS and you did not specify a suffix in the INITIALIZE RDF command,
start the RDFCOM session on the backup system as follows:
>RDFCOM DALLAS; STOP RDF
If the associated primary system is named \DALLAS and you specified the suffix “3” in
the INITIALIZE RDF command, start the RDFCOM session on the backup system as
follows:
>RDFCOM DALLAS3; STOP RDF