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System Managed Storage Concepts and Components 31
• Recovery
Recovery can be either at the individual data set level or to physically restore
a full volume. This is applicable for both SMS and non-SMS managed data
sets.
Note that full exploitation of this component requires the use of the DSS and
Optimizer components of DFSMS.
4.3.4 DFSMSrmm
The Removable Media Manager (RMM)
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component provides facilities for tape
and cartridge formats, including library, shelf, volume and data set level
management.
Tapes are an effective media for storing many types of data, especially backup
and archive copies of disk data sets. However, tapes must be mounted to be
used, and the capacity of tapes is often not fully used. DFSMS/MVS can be used
to assist in more effective use of tape resources.
With SMS, a group of disks can be defined to act as a buffer for tape drives, and
allow HSM to manage writing the tape volumes and data sets on those volumes.
DFSMS/MVS permits the use of system managed tape volumes, and RMM can
be used to manage the inventory of system managed and non system managed
tapes.
For further information on this topic, see the DFSMS/MVS V1R4 DFSMSrmm
Guide and Reference, SC26-4931-05.
4.3.5 DFSMSopt
The Optimizer (OPT) component is one of the supporting products of
DFSMS/MVS, and is a separately orderable feature. It provides data analysis and
simulation information, which assists in improving storage usage and reducing
storage costs. It can be used to:
Monitor and tune HSM functions.
Create and maintain a historical database of system and data activity.
Perform analysis of Management Class, and Storage Class policies, including
simulation, costing analysis, and recommendations for data placement.
Identify high I/O activity data sets, and offer recommendations for data
placement.
Monitor storage hardware performance of subsystems and volumes, including I/O
rate, response time, and caching statistics.
Fine tune the SMS configuration, by presenting information to help understand
how current SMS practices and procedures are affecting the way data is
managed.
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Other Vendor products exist which have similar capabilities, and can be used in place of RMM, although this may restrict full
exploitation of ISMF.