Recovery of extended format data sets

DFSMShsm recovers or restores an extended format data set (as indicated in the MCC record), using DFSMSdss as the data mover, as follows:

• If FROMDUMP(DUMPVOLUME(volser)) is not specified, DFSMShsm always recovers an incremental backup version of a multiple-stripe extended format data set, even if a physical dump copy is more recent than the incremental backup version.
• If FROMDUMP(DUMPVOLUME(volser)) is not specified, DFSMShsm fails the recovery of a multiple-stripe extended format data set if the data set has only been backed up by a physical full-volume dump.
• An extended format data set that had been multiple-stripe when it was backed up or dumped is recovered or restored as a single stripe or multiple-stripe extended format data set, regardless of the existence of the target data set before the RECOVER command is issued. The number of stripes depends on the storage class SUSTAINED DATA RATE value, and the availability of the required volumes.
• An extended format data set that had been single stripe when it was backed up or dumped is recovered or restored as a single stripe or multiple-stripe extended format data set, regardless of the existence of the target data set before the RECOVER command is issued. The number of stripes depends on the storage class SUSTAINED DATA RATE value, and the availability of the required volumes.
• A data set that was extended format when backed up or dumped is recovered or restored as a nonextended format but still SMS-managed data set if no SMS volumes supporting extended format data sets are available.
• If the ACS routine is modified to direct an extended format data set to a non-SMS-managed volume, or if no SMS-managed DASD volumes attached to an ESCON 3990 Model 3 are available, DFSMShsm fails the recover of the data set.
• A data set that was not extended format when it was backed up is always recovered or restored as a data set that is not extended format. DFSMShsm never converts a data set that is not extended format to an extended format data set through recover or restore processing, even if the data set is preallocated as an extended format data set before the RECOVER command is issued.
• If FORCENONSMS is specified on the RECOVER command to force an extended format data set to be recovered or restored to a non-SMS-managed volume, DFSMShsm recovers or restores the data set to a non-SMS-managed volume, but the data set becomes a data set that is not extended format.
• If FROMVOLUME is specified on the RECOVER command to recover an extended format data set, DFSMShsm fails the recover or restore.
• If reblocking is required for an extended format data set, DFSMShsm performs the reblocking.

To restore a single stripe extended format data set from a physical dump copy on a specific dump tape, you can issue:

   RECOVER dsname FROMDUMP(DUMPVOLUME(volser))