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28 Storage Management with DB2 for OS/390
Logical processing, which is data set oriented. This
means it performs against data sets independently of the
physical device format.
Physical processing, which can perform against data
sets, volumes, and tracks, but moves data at the
track-image level.
PRINT Used to print both VSAM and non-VSAM data sets, track
ranges, or a VTOC.
RELEASE Releases allocated but unused space from all eligible
sequential, partitioned, and extended format VSAM data
sets.
RESTORE Data can be restored to disk volumes from DFSMSdss
produced dump volumes, as individual data sets, an
entire volume, or a range of tracks. Again, logical or
physical processing can be used.
4.3.2.2 Filtering
The DSS component uses a filtering process to select data sets based upon
specified criteria. These include:
• Fully or partially qualified data set name
• Last reference data
• Size of data sets
• Number of extents
• Allocation type (CYLS, TRKS, BLKS)
•SMSClass
4.3.2.3 Converting Data to SMS
Data sets can be converted by data movement using the COPY or DUMP and
RESTORE functions. However, it is possible and quite common to convert data in
place, without the need for movement, by using the CONVERTV command. This
allows:
• The preparation of a volume for conversion by preventing new data set
allocations.
• Conversion simulation, to test for any data sets that do not match the
expected criteria.
• Actual conversion of a volume to SMS management.
• Converting a volume from SMS management, for example, as part of a
Disaster Recovery scenario.
4.3.3 DFSMShsm
The Hierarchical Storage Manager (HSM)
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component provides availability and
space management functions. For more information, please refer to the
DFSSMShsm Primer, SG24-5272.
HSM improves productivity by making the most efficient use of disk storage,
primarily by making better use of the primary volumes. It performs both
availability management and space management automatically, periodically, and
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Other Vendor products exist which have similar capabilities, and can be used in place of HSM, although this may restrict full exploitation
of ISMF.