If you restore a system from Save Storage (SAVSTG) media, the primary remote journal function concerns have to do with configuration changes involving additionally defined remote journals.
These remote journals were established after the SAVSTG media was produced. If a primary system is restored from SAVSTG media, journal receivers can be restored back to the primary system from versions saved from any of the associated remote journals in the remote journal environment. If a backup system is restored from SAVSTG media, then the catch-up phase for activating the remote journal can replicate all necessary journal receivers that are still online from the primary system to the restored backup system. Those journal receivers that are not online, and were attached to a *TYPE1 remote journal, can be restored back to the backup system. They can be restored from any saved versions of the journal receivers that were previously taken from one of the following:
- The primary system
- Any of the associated remote journals in the remote journal environment
See the Rules for saving and restoring journal receivers link below for the journal receiver restore rules which is typically used for this type of restore.
Another consideration occurs as part of the processing that is performed by the system when restoring journal receivers. Before associating a journal receiver with a local journal and retaining any remote journal information, the journal library name, and the system name or the independent disk pool name must be correct. This allows the system to differentiate between a local journal that was originally created and one that was restored to a different physical system using SAVSTG media. This case assumes that the user assigns a new system name as part of the SAVSTG procedure.
In one example case, the system was restored using
SAVSTG media but was not restored to the same physical system. However, the
restored system still had the same name as the system from where the media
was produced. This situation can cause problems and should be avoided.