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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This command also corrects discrepancies in the common recall queue. Displays the contents of locations within the DFSMShsm address space identified by an absolute address, a relative address, or a qualified address. Delete eligible data sets on a non-SMS-managed volume by command. You are introduced to the example system, which is referred to throughout the rest of this document.
However, the daily backup volume used to contain these manually backed up versions does not necessarily correspond to the day in the backup cycle when DFSMShsm created the backup version. There are two types of unassigned volumes: 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.
Migrate individual data sets or eligible data sets on a volume by command. DFSMSdss creates the multiple copies and continues its full-volume-dump process as long as one output copy is good. The full-volume-dump process can be one volume in and one dump copy out. When the generations for a particular volume have been reached and the next full-volume dump for that volume is performed, the control records for the oldest generation are discarded, regardless of the retention periods of the individual copies.
You can make the space available by deleting data sets that have outlived their usefulness, removing unused allocated space from data sets, moving low-activity data sets from level 0 volumes to other DASD or tape volumes, and returning the moved data sets to the level 0 devices when the administeation sets are needed. Backup function Backup is the process of copying a data set from a level 0 or an ML1 volume to daily backup volume.
Table 2 shows these commands and guidw SMS construct that assumes their functions. 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.
By command, recover user data sets or data sets of an application to their original system environment at another computer site. It also defines the automatic backup cycle, the secondary space management cycle, the dump dcsmshsm, dump classes, the volumes for aggregate recovery, and times for automatically demounting tapes currently vfsmshsm use by data set backup.
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.
IBM z/OS DFSMShsm Storage Administration (SC)
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.
DFSMShsm discards the contents of only the bad copies storae issues an appropriate message.
Fast replication target volumes: Space management proceduresdescribes procedures for starting and stopping space management under varying dfsmhsm. Creates a fast replication backup version for each volume in a specified copy pool. You can use restore or recover processing to: The space management functions begin at a specified time of day and only on a specific day of a cycle.
By command, back up user data sets. The fast replication backup versions can be dumped to tape. Data recovery scenarios Data recovery scenariosdescribes real-life examples of data loss and recovery situations. Daily backup volumes are assigned to a specific day in the backup cycle and contain the backup dfxmshsm created on that day.
You can dump different groups of volumes on different days with different periods for the number of days between dumps. Restore a volume from a full-volume dump. Automatically recall needed migrated data sets to level 0 volumes. Availability management is the function of the DFSMShsm program that you use to ensure that administartion customers can retrieve usable copies of their data sets should their online copies become lost or damaged.
It also includes situations where the lost data is a control data set or administrafion. Deletes all eligible expired backup versions from all backup volumes.
DFSMShsm Storage Administration Reference
stogage The purpose of the full-volume dump is to expedite the recovery process when an entire volume is lost or damaged and to supplement the incremental recovery process. DFSMShsm keeps generations of dump copies for any given volume unless all the copies in a generation expire. Also causes the data set backup switchtapes tuide to occur immediately.
By command, create a fast replication backup of a copy pool. 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.
DFSMShsm Storage Administration Guide
Allow your customers to issue commands to recover their own data sets. Delete eligible non-SMS migrated data sets on a migration volume by command.
Aggregate backup and recovery support ABARSwhich describes the command-driven functions that back up and administrarion a user-defined group aggregate group of data sets.
DFSMShsm can use these volumes only as daily backup volumes, but DFSMShsm determines which day in the backup cycle the volume should be assigned to when it first uses the volume. If all copies fail, the full-volume dump is failed. Recover a data set from the fast replication backup versions on DASD or tape. Note, that the first four commands are only for diagnosis and repair.
Uses fast replication to recover a single volume or a pool of volumes from the managed backup versions. DFSMShsm allows from one to five dump copies to be made concurrently for any one full-volume dump. DFSMSdss discontinues writing to dump copies on which errors occur. Deletes a migrated data set without recalling the data set. You can use FRBACKUP to dump an existing fast replication backup version, or when no backup version exists, create a fast replication backup version and dump it to tape.
When it first uses unassigned backup volumes, DFSMShsm assigns the volumes as daily or spill backup volumes. Use the following commands to directly manage data sets or volumes as opposed to the automatic management functions of DFSMShsm: Fast replication function Fast replication uses volume-level fast replication to create backup versions for sets of storage groups.