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

Managing RDF
Compaq NonStop™ RDF/IMP and IMPX System Management Manual—522204-001
5-14
Restarting RDF
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
An alternative way to stop RDF on the backup system is to enter the following command
through TACL:
>STATUS *, PROG $SYSTEM.RDF.*, STOP
Restarting RDF
If you want to restart RDF and have it resume processing where it stopped at the
previous shutdown, you can only do so if you have not reinitialized RDF subsystem
since the shutdown.
Use the START RDF command to restart RDF. RDF automatically starts with UPDATE
ON unless you explicitly specify UPDATE OFF in the START RDF command.
When RDF restarts, it uses the information in the context files to determine where it last
stopped, and resumes processing from that point.
Carrying Out a Planned Switchover
Many businesses run online transaction processing (OLTP) twenty-four hours a day.
Stopping applications to perform software or hardware upgrades, repairs, or other
maintenance can result in complications and inconvenience for system users. To
minimize such planned outages, you can perform a planned switchover from the primary
system to the backup system to keep applications running while you modify or repair the
primary system.
Note. If you delete and reconfigure TMF, then you must initialize RDF.