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This entry was originally published on 2013-10-29.
By Florence Dubois
If you are running with z/OS 1.13 or later, and using volume-level FlashCopy to backup your Db2 data (whether it is done outside of DB2's control or via the DB2 BACKUP SYSTEM), you should enable the DFSMSdss automatic UCB Refresh function.
By default, this function is disabled - which means that if the FlashCopy moves the VTOC on the target volume (source VTOC is in a different location than the target VTOC), then the target volume has to be varied offline/online before it can be accessed on systems other than the one that did the FlashCopy. This could result in failures for any processes that access the backup once it has been taken - an offload to tape for example.
The automatic UCB Refresh function can be enabled on z/OS 1.13 or later with the following command:
/MODIFY DEVMAN,ENABLE(REFUCB) or update of the PARMLIB member DEVSUPxx: ENABLE(REFUCB)
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