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Full system restore enhancement when restoring from both *FULL and *CUML saves.
The last defense in a DR strategy is restoring a whole system from tapes using the recovery report (QP1ARCY) and that is a very time consuming task.
If the backup strategy is done by using *FULL backups, maybe once a week, and *CUML the rest of the days and you end up restoring the whole system from tapes using the BRMS guided restore (the recovery report QP1ARCY), BRMS is not smart enough to only restore the most recent version of saved objects.
You first need to restore all library and objects saved with the *FULL backup and then restore all changed objects that are saved during the *CUML save. That means that most objects that are save with a *CUML backup actually needs to be restores twice, first from the *FULL save and then from *CUML save and that can be several TB of data that needs to be restored twice.
There is also a risk that the format of a file have been changed between the *FULL and *CUML save. The restore of the file from the *CUML save will then fail with the error: CPF3283 "Saved file or member level ID not same as file xxxxxxx". You will then have to delete the file that exist on the system and then restore the file from the *CUML save again This also adds extra time to the restore.
BRMS should handle this, either by skipping the objects from the *FULL save that also will be restored from the *CUML save or by restoring objects from the *CUML save first and then the objects from the *FULL save with RSTLIB OPTION(*NEW).
The solution should be documented and supported from IBM/Helpsystems and also described in the recovery report (QP1ARCY)
Would reduce a DR restore time significantly and also probably reduce errors during the restore.
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