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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DFSMShsm Storage Administration Reference
Functions of availability management: In an SMS environment, the storage management functions defined in the management class and the storage group control the SMS-managed data sets in place of the parameter or command definitions within DFSMShsm. Space management of SMS-managed storagedescribes the tasks to be performed and the results of processing for space management of data sets managed by the storage management subsystem SMS.
The fast replication backup versions can be dumped to tape. Deletes a migrated data set without recalling the data set. By command, recover data sets from fast zdministration backup versions.
Dump is the process of copying all data from a DASD volume to dump tape volumes.
The dump time stamps reflect when the fast replication backup version is made, not the actual time of the dumps. Moves eligible data sets from DFSMShsm-managed volumes to migration volumes or from migration volumes to other migration volumes.
By command, back up data sets of an application to tape so they can be taken to another computer site for recovery. Recovery from a fast replication backup version can be performed at the copy pool level from a disk copy, at the individual volume level from a disk or tape copy, or at the data set level from a disk or tape copy.
The full-volume-dump process can be one volume in and one dump copy out. DFSMShsm keeps generations of dump copies for any given volume unless all the copies in a generation expire.
Restore a volume from a full-volume dump and update the volume from later incremental backup versions. Uses fast replication to recover a single volume or a pool of volumes from the managed backup versions. Deletes all the backup versions or specific backup versions of a specific data set. 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.
Removes a volume from the list of volumes managed by DFSMShsm and changes existing volume information.
DFSMShsm Storage Administration Guide
For example, backup copies of the control data sets should be kept, and the DFSMShsm-owned volumes must be maintained. DFSMShsm automatically creates backup versions of data sets on specified days beginning at a specified time of day.
A specific request number All requests for a particular user All requests for a particular data set. Unassigned daily backup volumes are dffsmshsm volumes defined aadministration DFSMShsm as daily backup volumes but not associated with any day in the backup cycle.
Data recovery scenarios Data recovery scenariosdescribes real-life examples of data loss and recovery situations. Backup is the process of copying a data set from a level 0 or an ML1 volume vuide daily backup volume.
Aggregate backup and recovery support ABARSwhich describes the command-driven functions that back up and recover a user-defined group aggregate group of data sets.
IBM z/OS DFSMShsm Storage Administration (SC)
Tape spill volumes also receive all valid backup versions of data sets when a tape backup volume is recycled. To stop such a command from interfering with your use of your terminal, have the computer system operator issue a HOLD command for the function that is causing the interference. Restore a data set from a dump copy. Each dump copy is a complete image administrafion the dumped volume, not just an incremental backup of selected data sets.
Recover a single volume from the fast replication backup versions on DASD dfs,shsm tape. If a command is running for a long time and is returning data to your terminal, you can be prevented from performing other operations at your terminal. Space management The following topics introduce the dfsmshsk necessary to control space management functions. Automatically recall needed migrated data sets to level 0 volumes. By command, recover a specific data set from either a dump copy or an incremental backup version.
Table 2 shows these commands and the SMS construct that assumes their functions.
DFSMShsm volume recovery can use incremental backups or full-volume dumps or both.