VSAM RLS support requires the coupling facility to define cache structures for cross system buffer invalidation. You need to determine the number and size of cache structures you require.
The number needed depends on factors such as:
See the z/OS DFSMSdfp Storage Administration Reference manual for information about calculating the amount of space you will need for the cache structures. If you have previously used data sets in LSR mode, the total amount of coupling facility space allocated to cache structures should not be less than the amount of storage you were using for LSR pools, including hiperspace buffers (if used).
You can achieve performance benefits by:
You define cache structures in the CFRM policy with the IXCMIAPU utility.
You define cache sets with the ISMF control data set (CDS) application.
A cache set maps on to one or more cache structures. If more than one cache set is specified, the data sets can be re-bound to another cache structure in the set in the event of a cache structure failure.
See the z/OS DFSMSdfp Storage Administration Reference manual for more information about cache sets.
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