RDF System Management Manual for H-Series RVUs (RDF 1.8)

Where Issued
You can issue the STOP RDF, DRAIN and STOP RDF, REVERSE commands only at the primary
system.
Security Restrictions
You can issue the STOP RDF command if you are a member of the super-user group that initialized
RDF and have a remote password from the RDF primary system to the backup.
RDF State Requirement
You can issue the STOP RDF, DRAIN and STOP RDF, REVERSE commands only while RDF is
running and update is on.
Usage Guidelines
The decision to stop RDF is a management decision that should be carefully planned and
performed. Operators should never issue the STOP RDF command strictly on their own initiative.
To execute a planned RDF shutdown, you should generally use the STOP TMF command rather
than STOP RDF. Issue the STOP TMF command at the primary system while the communications
lines are up. In addition to stopping TMF, this action stops all RDF processes and saves the
context of each process in a file.
For information about when to use the STOP RDF command and how it affects the primary and
backup databases, see “Restarting RDF” (page 133). For more information about stopping RDF,
continue with this discussion.
There are three ways to stop RDF:
• Issue a STOP TMF command at the primary system.
As noted earlier, this is the recommended method for terminating RDF processing. When
you issue the TMFCOM command STOP TMF, RDF also shuts down after RDF encounters
the TMF shutdown record in the MAT. This method ensures that the primary and backup
databases are logically identical with one another when RDF stops. When you restart RDF,
the context file directs RDF where to resume.
• Issue a STOP RDF command at the primary system.
If the decision has been made to stop RDF without stopping TMF, issue a STOP RDF
command at the primary system. RDF stops immediately after all RDF processes save context
information in the context file.
• Issue a STOP RDF command at the backup system.
You should use this method of stopping RDF only if either one of these two conditions is
true:
— The RDF monitor process is not running on the primary system.
— All communications lines to the primary system are down.
If the decision has been made to stop RDF on the backup system, issue a STOP RDF
command at the backup system. All processes running on the backup system write
context information to a context file and then stop.
If the communications lines between the primary and backup systems are up, a STOP
RDF command issued at the backup system fails, and RDFCOM displays an error
message.
NOTE: Before you can restart RDF, you must stop RDF on the primary system as well.
As it shuts down RDF, the STOP RDF command writes a message to the RDF log file indicating
this action.
236 Entering RDFCOM Commands