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
Space management The following topics introduce the tasks necessary gjide control space management functions. The list command that is causing you trouble does not restart. If all copies fail, the full-volume dump is failed. By command, restore a volume from a dump copy and update the restored volume from later incremental backup versions. By command, back up user data sets.
Daily backup volumes are assigned to a specific day in the backup cycle and contain the backup versions created storrage that day. 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. Availability management The following topics introduce the tasks necessary to control availability management functions. DFSMShsm can create backup versions of data sets either automatically or by command.
Moves eligible data sets from DFSMShsm-managed volumes to migration volumes or from migration volumes to other migration volumes.
DFSMShsm Storage Administration Guide
Displays the contents of locations within the DFSMShsm address space identified by an absolute address, a relative address, or a qualified address.
Fast replication target volumes: 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. 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.
For example, backup copies of the control data sets should be kept, and the DFSMShsm-owned guidr must be maintained. Other availability management considerationswhich describes aspects of availability management that deserve consideration but are peripheral to the discussions in the preceding topics. You can specify on a system-wide basis how often backup runs.
Recover an earlier version of the data set without deleting the current version. Reconnect unchanged data sets that are recalled from ML2 tapes to their original ML2 tapes with the fast subsequent migration function. It also includes situations where the lost data is a control administgation set or journal. Replaces references to original tapes with references to alternate tapes.
Operating procedures for DFSMShsmdescribes procedures to be performed by the computing system operator. Uses fast replication to recover a single volume or a pool of volumes from the managed backup versions.
DFSMShsm Storage Administration Guide
It contains examples of the commands needed to perform the tasks, descriptions of the processing that DFSMShsm performs, and examples of the results of that processing. This function and the following one are known as automatic secondary space management.
DFSMShsm uses unassigned volumes whenever it needs more daily or spill backup volumes. Recover a pool of volumes from the fast replication backup versions on DASD. Availability management procedureswhich describes procedures for starting and stopping availability management under varying conditions.
Recover a data set from the fast replication backup versions on DASD or tape. 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.
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. There are two types of unassigned volumes: Each successive full-volume dump of a volume, regardless of adminixtration number of dump copies, is a generation.
DFSMShsm automatically creates backup versions of data sets on specified days beginning at a specified time of day. Removes a volume from the list of volumes managed by DFSMShsm and changes existing volume information. Creates a backup version of a specific data set.
Fast replication uses volume-level fast replication to create backup versions for sets of storage groups. Moves all migration copies meeting a specified age criteria between DFSMShsm migration or backup volumes. Space management proceduresdescribes procedures for starting and stopping space management under varying conditions.
Fast replication function Fast replication uses volume-level fast replication to create backup versions for sets of storage groups. 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 data sets must meet eligibility criteria and must be on DFSMShsm-managed volumes that have been designated for automatic backup.
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 creates these backup versions during the backup of a level 0 volume or during the backup of migrated data sets. The space management functions begin at a specified time of day and only on a specific day of a cycle. Requests that DFSMShsm back up eligible data sets on one or more volumes, in one or administratiom storage groups, or on all primary volumes; or that it back up the control data sets.