DFSMShsm complements DFSMSdss to
provide the following functions:
- Storage management
- DFSMShsm provides
automatic DASD storage management, relieving users from manual storage
management tasks.
- Space management
- DFSMShsm improves
DASD space usage by keeping only active data on fast-access storage
devices. It automatically frees space on user volumes by deleting
eligible data sets, releasing overallocated space, and moving low-activity
data to lower cost-per-byte devices, even if the job did not request
tape.
- Tape mount management
- DFSMShsm can
write multiple output data sets to a single tape, making it a useful
tool for implementing tape mount management under SMS. When you redirect
tape data set allocations to DASD, DFSMShsm can move
those data sets to tape, as a group, during interval migration. This
methodology greatly reduces the number of tape mounts on the system. DFSMShsm uses
a single-file format, which improves your tape usage and search capabilities.
- Availability management
- DFSMShsm backs
up your data—automatically or by command—to ensure availability if
accidental loss of the data sets or physical loss of volumes should
occur. DFSMShsm also allows the storage administrator
to copy backup and migration tapes, and to specify that copies be
made in parallel with the original. You can store the copies on site
as protection from media damage, or offsite as protection from site
damage. DFSMShsm also provides disaster backup and
recovery for user-defined groups of data sets (aggregates) so that
you can restore critical applications at the same location or at an
offsite location.
Requirement: You must also have DFSMSdss to
use the DFSMShsm functions.
Related reading: For more information, see Understanding DFSMShsm.
z/OS DFSMS Introduction
Copyright IBM Corporation 1990, 2014