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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You can dump different groups of volumes on different days with different periods for the number of days between dumps. When DFSMShsm needs another daily backup volume, it chooses an unassigned daily backup volume before it chooses an unassigned backup volume. It also defines the adminitration backup cycle, the secondary space management cycle, the dump cycle, dump classes, the volumes for dfsmxhsm recovery, and times for automatically demounting tapes currently in use by data set backup.

Availability management The following topics administrwtion the tasks necessary to control availability management functions. DFSMShsm can create backup versions of data sets either automatically or by command.

DFSMShsm Storage Administration Reference

Functions of availability management: Restore a volume from a full-volume dump. Recover a pool of volumes from the fast replication backup versions on DASD. Recover a single volume from the fast replication backup versions on DASD or tape. 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. 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 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.

Use the following commands to maintain and recover the control data sets and the DFSMShsm address space. 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.

Data recovery scenarios Data recovery scenariosdescribes real-life examples of data loss and recovery situations. Making disaster backup copies of DFSMShsm-owned tape volumeswhich describes how to make backup copies of DFSMShsm-owned, cartridge-type, single-file-format tape volumes and how to recover those volumes. 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.

The data sets must meet eligibility criteria and must be on DFSMShsm-managed volumes that have been designated for automatic backup. Use the following commands and parameters to determine status: Backup function Backup is the process of copying a data set from a level 0 or an ML1 volume to daily backup volume.

It describes a variety of situations where data is lost, and what steps to take to recover that data. 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. Backup is the process of copying a data set from a level 0 or an ML1 volume to daily backup volume.

By command, create a fast replication backup of a copy pool. You can specify how frequently to back up data sets on a data set basis for SMS-managed data sets and on a system-wide basis for non-SMS-managed volumes. Moves eligible data sets from DFSMShsm-managed volumes to migration volumes or from migration volumes to other migration volumes. 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 recall needed migrated data sets to level 0 volumes. Combines the entries in the journal data set with a restored backup copy of one or all of the control data sets. Use the following commands to directly manage data sets or volumes as opposed to the automatic management functions of DFSMShsm: Backs up aggregate groups of user-defined data sets for recovery at another location.

By command, recover a specific data set from either a dump copy or an incremental backup version. The process of removing guice space from the data sets is called space reduction. How to use this document.

z/OS DFSMShsm Storage Administration

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.

Operating procedures for DFSMShsmdescribes procedures to be performed by the computing system operator.

Requests that DFSMShsm back up eligible data sets on one or more volumes, in one or more storage groups, or on all primary volumes; or that it back up the control data sets.

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