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 keeps generations of dfsmshm copies for any given volume unless all the copies in a generation expire. Recover a data set from the fast replication backup versions on DASD or tape. DFSMShsm automatically creates backup versions of data sets on specified days beginning at a specified time of day. 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. Each dump copy in a generation is associated with a different dump class, which specifies how the dump copy is to be managed.
DFSMShsm Storage Administration Reference
DFSMShsm discards the contents of only the bad copies and issues an appropriate message. Moving the data sets as opposed to deleting administratlon removing unused space from them is called migration. 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. Data recovery scenariosdescribes real-life examples of data loss and recovery situations.
Update specific fields within the control data sets: The purpose of backup is to have copies of data sets in case something happens to the original data sets. By command, recover a specific data dfsmshm from either a dump copy or an incremental backup version.
Requests that DFSMShsm back up eligible data sets on one or more volumes, in giude or more storage groups, or on all primary volumes; or that it back up the control 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.
Backup is the process of copying a data set from a level 0 or an ML1 volume to daily backup volume. Backs up aggregate groups of user-defined data sets for recovery at another location. A specific request number All requests for a particular user All requests for a particular data set. It also defines the automatic backup cycle, the secondary space management cycle, the dump cycle, dump classes, the volumes for aggregate recovery, and times for automatically demounting tapes currently in use by data set backup.
DFSMShsm Storage Administration Reference
Other commands can also run for a long time. Table 2 shows these commands and the SMS construct that assumes their functions. Instead, the daily backup volume corresponds to the day in the backup cycle that DFSMShsm moved the backup wdministration from its temporary location on an ML1 volume to a daily backup volume.
Deletes one or more unneeded fast replication backup versions.
You are introduced to the example system, which is referred to throughout the rest of this document. Automatically clean administrafion migration volumes and the migration control data set MCDS. DFSMShsm allows from one to five dump copies to be made concurrently for any one full-volume dump. Other availability management considerationswhich describes aspects of availability management that deserve consideration but are peripheral to the discussions in the preceding topics.
DFSMShsm uses unassigned volumes whenever it needs more daily or spill backup volumes. In addition to the activities that cause the DFSMShsm program to perform its space management and availability management functions, certain other activities afministration the security and efficiency of DFSMShsm itself. By command, recover data sets from fast replication backup versions.
Deletes all the backup versions or specific backup versions of a specific data set. The dump time stamps reflect when the fast replication backup version is made, not the actual time of the dumps. There are two types of unassigned volumes: Recovery is the process of retrieving a full-volume dump or a backup version of a data set or a volume.
Replacing cartridge-type tape volumes with their alternate volumes TRAP command: Dump is the process of copying all data from a DASD volume dfsmhssm dump tape volumes. Making disaster backup copies of DFSMShsm-owned tape volumeswhich describes how to make backup copies of DFSMShsm-owned, cartridge-type, administratuon tape volumes and how to recover those volumes.
Fast replication uses volume-level fast replication to create backup versions for sets of storage groups. You can dump different groups yuide volumes on different days with different periods for the number of days between dumps. It contains examples of the commands needed to perform the tasks, descriptions of the processing that DFSMShsm performs, administrafion examples of the results of that processing.
The full-volume-dump process can be one volume in and one dump copy out. Deletes a migrated data set without recalling the data set. 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.
z/OS DFSMShsm Storage Administration
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.
Functions of space management: Changes the number of backup versions maintained and the frequency of creating backup versions for a non-SMS-managed data set. Other space management considerationsdescribes aspects of space management that deserve consideration but are peripheral to the discussions in the two preceding topics.
It also includes situations where the lost data is a control data set or journal. The list command that is causing you trouble does not restart. Availability management of non-SMS-managed storagewhich describes the tasks to be performed and the results of processing for availability management of data sets not managed by SMS.
DFSMShsm can create backup versions of data sets either automatically or by command. Arministration example, backup copies of the control data sorage should be kept, and the DFSMShsm-owned volumes must be maintained.