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Defining storage classes z/OS DFSMS OAM Planning, Installation, and Storage Administration Guide for Object Support SC23-6866-00 |
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16d Define storage classes. You must perform this step at initial installation. During migration, you must perform this step if you are adding or modifying storage classes for object tape storage or file system sublevels. OAM interprets the parameters used to define the storage class
in an attempt to apply the stated performance objective. The following
parameters are used by OAM as an indication of the performance objective
for the object:
OAM attempts to meet the performance objective by placing the object
at a level in the storage hierarchy that comes closest to the objective.
Avoid using performance objectives that force objects to be written
directly to optical storage. Writing objects directly to optical media
without staging them through the DB2 sublevel can degrade system performance
and significantly increase the number of optical disks needed per
day, due to inefficient optical VTOC directory space utilization.
See Table 1 for detailed information about the effects
of writing objects directly to optical media.
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Copyright IBM Corporation 1990, 2014
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