RDF/IMP, IMPX, and ZLT System Management Manual

Entering RDFCOM Commands
HP NonStop RDF/IMP, IMPX, and ZLT System Management Manual—524388-002
8-101
Command Overview
If the failed primary system is eventually restored to operation, and you want it to
function again as the primary system, do the following:
1. Stop the applications and TMF on the old backup system.
2. Back up the database on the old backup system and restore it to the old primary
system.
3. Configure TMF on the old primary system.
4. Initialize RDF on the old primary system.
5. Restart TMF on the old backup system.
6. Start the TMF and RDF subsystems on the old primary system.
7. Start the applications on the old primary system.
For further related considerations, see also Exception File Optimization in section 5.
Limitation
When building the undo list for an RDF takeover operation, the purger has a limit of
655,360 transactions. If this limit is exceeded, the purger process logs an RDF event
853 and abends. In this situation, contact your service provider.
Example
The following command sequence initiates RDF TAKEOVER processing in which the
backup system \TORONTO takes over processing from the primary system
\SANFRAN.
1. From the TACL command interpreter on the backup system (\TORONTO), enter:
>RDFCOM SANFRAN
2. From within the RDFCOM session, enter:
]TAKEOVER
3. RDF displays the following prompt message:
*** TAKEOVER assumes a disaster on \SANFRAN has occurred.
Are you sure you want to TAKEOVER?
To proceed with the TAKEOVER operation, enter Y or YES.
To stop the TAKEOVER operation, enter N or NO.
After you enter your response, RDFCOM prompts you for your next command.