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))
To restore an existing multiple-stripe extended format data set
from a physical dump tape, you must issue the RECOVER dsname FROMDUMP(DUMPVOLUME(volser)) command
for each stripe of the data set. If the extended format data set no
longer exists, you must catalog the data set after the restore operations.
DFSMShsm and DFSMSdss do not catalog a multiple-stripe extended format
data set during physical data set restore processing.