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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Functions of space management: Reconnect unchanged data sets that are recalled from ML2 tapes to their original ML2 tapes with the fast subsequent migration function.
z/OS DFSMShsm Storage Administration
If DFSMShsm finds any volume without the specified amount of space, it performs migration from all such huide known as event-driven migration following a space check. Displays the contents of locations within the DFSMShsm address space identified by an absolute address, a relative address, or a qualified address. Backup function Backup is the process of copying a data set from a level 0 or an ML1 volume to daily backup volume.
Unassigned daily backup volumes are those volumes defined to DFSMShsm as daily backup dfskshsm but not associated with any day in the backup cycle.
DFSMShsm Storage Administration Reference
Fast replication target volumes are defined with the SMS adimnistration pool backup storage group type. You can specify how frequently to back up data sets on a data set basis for SMS-managed data dfsmxhsm and on a system-wide basis for non-SMS-managed volumes. Other commands can also run for a long time. Requesting a fast replication recovery HOLD command: The fast replication backup versions can be dumped to tape. Space management is the DFSMShsm program function that you use to ensure that your customers have space available on DASD volumes to allocate new data sets or to extend old ones.
The full-volume-dump process can be one volume in and one dump copy out. By command, create a fast replication backup of a copy pool.
Automatically recall needed migrated data sets to level 0 volumes. 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.
When the generations for a particular volume have been reached and the next full-volume dump adminisgration that volume is performed, the control records fuide the oldest generation are discarded, regardless of the retention periods of the individual copies.
DFSMShsm volume recovery can use incremental backups or full-volume dumps or both. By command, back up user data sets. Recovery is the process of retrieving a full-volume dump or a backup version of a data set or a volume.
Fast replication uses volume-level fast replication to create backup versions for sets of storage groups.
Each successive full-volume dump of a volume, regardless of the number of dump copies, is a generation. 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. DFSMSdss discontinues writing to dump copies on which errors occur. Moves all migration copies meeting a specified age criteria between DFSMShsm migration or backup volumes.
Recover a data set from adminitsration fast replication backup versions on DASD or tape. Migrate individual data sets or eligible data sets on a volume by command.
Creates a backup version of a specific data set. This is known as incremental backup. It also includes situations where the lost data is a control data set or journal. Operating procedures for DFSMShsmdescribes procedures to be performed by the computing system operator. This Fast Replication function enables the backup and recovery of a large set of volumes to occur within a small time frame. DFSMShsm automatically creates backup versions of data sets on specified days beginning at a specified time of day.
Deletes all eligible expired backup versions from all backup volumes. Recovery and restore of data sets Recovery and restore are processes that are requested only by command, not automatically, for backed up data sets. 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. The data sets must meet eligibility criteria and must be on DFSMShsm-managed volumes that have been designated for automatic backup.
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. DFSMShsm allows from one to five dump copies to be made concurrently for any one full-volume dump. 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.
You can use restore or recover processing to: You can make the copies available by making daily incremental backup copies of changed data sets, making periodic dump copies of the DFSMShsm-managed and ML1 volumes, making aggregate backup copies of data sets that your operation will need if your installation is damaged, and making fast replication backup versions for sets of storage groups.
Also causes the data set backup switchtapes action to occur immediately.
DFSMShsm Storage Administration Reference
You can specify on a system-wide basis how often backup runs. If all copies fail, the full-volume dump is failed. Table 2 shows these commands and the SMS construct that assumes their functions. The list command that is causing you trouble does not restart.