Explanation: DSSXMMODE is an optional parameter
specifying whether DFSMSdss is loaded in its own address space, or
in the DFSMShsm address space, for backup, CDS backup, dump, migration,
and full-volume and data set recovery functions.
This parameter can be issued from the ARCCMDxx PARMLIB member only
and does not affect FRBACKUP and FRRECOV use of the DFSMSdss cross
memory interface.
The following parameters are optional parameters of the DSSXMMODE
parameter:
- N
- DFSMSdss will not be loaded into its own address space for the
DFSMShsm function being invoked. Instead, DFSMSdss will be loaded
in the DFSMShsm address space. This is the default.
- Y
- DFSMSdss will be loaded into a new address space for the DFSMShsm
function being invoked and will be retained for future invocations
of the that function, until DFSMShsm has been shutdown or restarted.
- BACKUP
- Controls where DFSMSdss for the DFSMShsm backup function will
be loaded; in its own address space (Y) or in the DFSMShsm address
space (N). The default is N (no).
- CDSBACKUP
- Controls where DFSMSdss for the DFSMShsm CDS backup function
will be loaded; in its own address space (Y) or in the DFSMShsm address
space (N). The default is N (no).
- DUMP
- Controls where DFSMSdss for the DFSMShsm dump function will
be loaded; in its own address space (Y) or in the DFSMShsm address
space (N). The default is N (no).
- MIGRATION
- Controls where DFSMSdss for the DFSMShsm migration function
will be loaded; in its own address space (Y) or in the DFSMShsm address
space (N). The default is N (no).
- RECOVERY
- Controls where DFSMSdss for the DFSMShsm full-volume and data
set recovery functions will be loaded; in their own address space
(Y) or in the DFSMShsm address space (N). The default is N (no).
Note: - When issuing the FRBACKUP or FRRECOV command to
back up volumes to disk or to recover volumes and data sets from disk,
DFSMSdss will always be loaded in its own address space. Note that
FRBACKUP processing, automatic dump processing, and FRRECOV processing
all invoke DFSMSdss to dump from fast replication volumes to tape,
or to restore from tape. DFSMSdss address space identifiers can be
started optionally, based on the SETSYS DSSXMMODE command in the ARCCMDxx
member of the SYS1.PARMLIB.
- The DFSMShsm recall function will always run with DFSMSdss loaded
in the DFSMShsm address space.
SMS relationship: None.
SETSYS default: If you specify the DSSXMMODE
parameter without N (no), Y (yes), or a specific function, then the
SETSYS default for this parameter and all unspecified functions is
to run with DFSMSdss loaded in the DFSMShsm address space.
DFSMShsm default: If you do not specify DSSXMMODE
on the SETSYS command during startup, the default is to load DFSMSdss
in the DFSMShsm address space.