z/OS DFSMShsm Storage Administration to use IBM z/OS DFSMShsm, a component of DFSMS that manages your storage in a ( MB). For additional information on SETSYS parameters reference the DFSMShsm Storage Administration. Reference manual (SC). |. •. HSMSTSYS. Today’s storage arrays offer Automated Storage Tiering features DFSMShsm – A long history of reducing storage cost Administration Guide.
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By command, restore a volume from a dump copy and update the restored volume from later incremental backup versions. Automatically delete, remove unused space from, and move data sets on DFSMShsm-managed volumes to provide a specified amount of free space on each volume. Deletes a migrated data set without recalling the data set. Unassigned backup volumes are those volumes defined to DFSMShsm as backup volumes but not specified as daily or spill backup volumes.
DFSMShsm Storage Administration Reference
By command, back up user data sets. If all copies fail, the full-volume dump is failed. Fast replication target volumes are defined with the SMS copy pool backup storage group type. Fast replication target volumes contain the fast replication backup copies of DFSMShsm-managed volumes.
The difference between dump and backup is that the dump function backs up the entire allocated space on a volume, whereas the DFSMShsm backup function backs up individual data sets. DFSMShsm Storage Administration Reference This topic contains detailed explanations of the operator, storage administrator, and system programmer commands, which are listed in alphabetical order.
Automatically clean up migration volumes and the migration control data set MCDS. DFSMShsm automatically creates backup versions of data sets on specified days beginning at a specified time of day.
IBM z/OS DFSMShsm Storage Administration (SC)
Space management of non-SMS-managed storagedescribes the tasks to be performed and the results of processing for space management of data sets not managed by SMS. Deletes one or more unneeded fast replication backup versions. By command, recover data sets from guidd replication backup versions. Space management The following topics introduce the tasks necessary to control space management functions.
Displays the contents of locations within the DFSMShsm address storsge identified by an absolute address, a relative address, or a qualified address. Replacing cartridge-type tape volumes with their alternate volumes TRAP command: Moves eligible data sets from DFSMShsm-managed volumes to migration volumes or from migration volumes to other migration volumes. Delete eligible non-SMS migrated data sets on a migration volume by command.
DFSMShsm Storage Administration Guide
You can dump different groups of volumes on different days with different periods for the number of days between dumps. Use the following commands to directly manage data sets or volumes as opposed to the automatic management functions of DFSMShsm: Changes the number of backup versions maintained and the frequency of creating backup versions for a non-SMS-managed data set.
Spill backup volumes contain older backup versions of data sets. A specific request number All requests for a particular user All requests for a particular data set. Recover a data set that has been lost or damaged. Availability management procedureswhich describes procedures for starting and stopping availability management under varying conditions.
Automatically or by command, create a dump copy of a fast replication DASD backup version By command, recover volumes that have a fast replication backup version.
This command also corrects discrepancies in the common recall queue. You can specify on a system-wide basis how often backup runs.
DFSMShsm allows from one to five dump copies to be made concurrently for any one full-volume dump. Tape spill volumes also receive all valid backup versions of data sets when a tape backup volume is recycled.
This operation is called automatic primary space management. Other availability management considerationswhich describes aspects of availability management that deserve consideration but are peripheral to the discussions in the preceding topics. In addition to the activities that cause the DFSMShsm program to perform its space management and availability management functions, certain other activities maintain the security and efficiency of DFSMShsm itself.
The dump time stamps reflect when the fast replication backup version is made, not the actual time of the dumps. By command, recover user data sets or data sets of an application to their original system environment at another computer site. DFSMShsm discards the contents of only the bad copies and issues an appropriate message.
Other space management considerationsdescribes aspects of space management that deserve consideration but are peripheral to the discussions in the two preceding topics. Update specific fields within the control data sets: You can make the copies available by making daily incremental backup copies of changed data sets, making periodic dump copies of the DFSMShsm-managed and ML1 volumes, making aggregate backup copies of data sets that your operation will need if your installation is damaged, and making fast replication backup versions for sets of storage groups.