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 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.
DFSMShsm Storage Administration Guide
The data sets must meet eligibility criteria and must be on DFSMShsm-managed volumes that have been designated for automatic backup. Instead, the daily backup volume corresponds to the day in the backup cycle that DFSMShsm moved the backup version from its temporary location on an ML1 volume to a daily backup volume.
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. You can dump different groups of volumes on different days with different periods for the number of days between dumps.
Fast replication target volumes contain the fast replication backup copies of DFSMShsm-managed volumes. Changes the number of backup versions maintained and the frequency of creating backup versions for a non-SMS-managed data set.
Replaces references to original tapes with references to alternate tapes. Operating procedures for DFSMShsmdescribes procedures to be performed by the computing system operator.
See Recovering control data sets using the enhanced CDS recovery function for the recommended way to recover control data sets that run outside the DFSMShsm address space. Availability management The following topics introduce the tasks necessary to control availability management functions. By command, recover a specific data set from either a dump copy or an incremental backup version.
By command, create a fast replication backup of a copy pool. Data recovery scenariosdescribes real-life examples of data loss and recovery situations. 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. Each dump copy in a generation is associated with a different dump class, which specifies how the dump copy is to be managed. 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.
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 data sets are needed. You can use restore or recover processing to: Daily backup volumes are assigned to a specific day in the backup cycle and contain the backup versions created on that day.
Dump is the process of copying all data from a DASD volume to dump tape volumes.
Delete admihistration data sets on a non-SMS-managed volume by command. 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.
The fast replication backup versions can be dumped to tape.
Functions of availability management: Automatically, or by command, migrate data sets from level 1 migration volumes to level 2 migration volumes. If rfsmshsm 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. By command, restore a volume from a dump copy and update the restored volume from later incremental backup versions.
z/OS DFSMShsm Storage Administration
This function and the following one are known as automatic secondary space management. By command, recover data sets from fast replication backup versions. 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.
Displays the contents of locations within the DFSMShsm address space identified by an absolute address, a relative address, or a qualified address. Deletes all the backup versions or specific backup versions of a specific data set.
Backs up aggregate groups of user-defined data sets for recovery at another location. DFSMShsm discards the contents of only the bad copies and issues an appropriate administraton. Fast replication function Fast replication uses volume-level fast replication to create backup versions for sets of storage groups.
Creates a backup version of a specific data set. You can make the copies available by making daily incremental backup copies of changed data sets, administratjon periodic dump copies of the DFSMShsm-managed and ML1 volumes, making aggregate backup copies of data sets that your sfsmshsm will need if your installation is damaged, and making fast replication backup versions for gguide of storage groups.
A specific request number All requests for a particular user All requests for a particular data set. Dvsmshsm 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. Use the following commands to directly manage data sets or volumes as opposed to the automatic management functions of Administratioj Recover an earlier version of the data set without deleting the current version.
By command, recover user data sets or data sets of an application to their original system environment at another computer site. Restore a volume from a full-volume dump. DFSMShsm volume recovery can use incremental backups or full-volume dumps or both.