ATTRIBUTE

COMMENT

 

 

Backup

-Who can back up the data (the storage administrator

 

or the user, or both).

 

- If automatic backup should be taken for a data set.

 

- Backup frequency (number of days between

 

backups).

 

- Number of backup versions (data set exists).

 

- Number of backup versions (data set deleted).

 

- Retention of backups once a data set has been

 

deleted.

 

- Backup copy type (incremental, full volume dump).

 

 

5.3.4Storage Group

5.3.4.1Description

Prior to SMS, disk storage was maintained as individual volumes, requiring manual intervention to prevent volumes from filling up, and to prevent I/O bottlenecks. SMS significantly improves the management of disk by building on DFHSM capabilities to pool volumes together in Storage Groups.

A Storage Group is a pool of disk volumes upon which SMS managed data sets are placed. These groups are normally transparent to users. A data set is placed on an appropriate volume within a Storage Group depending upon the Storage Class, volume, Storage Group status, and available free space. New data set allocations can be directed to as many as 15 Storage Groups, although only one Storage Group is finally selected.

Each Storage Group has attributes which determine a range of characteristics for the volumes in that group. This includes backup, migration, and space thresholds.

A volume can belong to one of the following main Storage Group types; POOL, DUMMY or VIO. Three other types also exist; OBJECT, OBJECT BACKUP and TAPE, although these are not as commonly used.

Storage Groups:

Cannot share a volume.

Cannot share data sets.

Must contain whole volumes.

Must contain volumes of the same device geometry.

Can contain multi-volume data sets.

Must contain a VTOC and a VVDS.

SMS selects the volumes used for data set allocation by building a list of all volumes from the Storage Groups assigned by the ACS routine. Volumes are then either removed from further consideration or flagged as primary, secondary, or tertiary volumes.

Primary volumes meet the following criteria:

SMS Storage Group and volume status of ENABLED

MVS volume status of ONLINE

Requested initial access response time (IART)

Storage Management with DFSMS 43

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IBM 5695-DF1, 5655-DB2 manual Storage Group

5695-DF1, 5655-DB2 specifications

IBM 5655-DB2 and 5695-DF1 are significant components within the IBM software ecosystem, predominantly focusing on data management and integration solutions. These offerings cater primarily to enterprise environments that require robust database management systems and associated frameworks to maintain and manipulate data efficiently.

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