Planning for availability

In order for VSAM RLS processing to take place, you must ensure the following:

Run all systems performing RLS as a Parallel Sysplex®
Define and activate at least two sharing control data sets (SHCDS), and one spare SHCDS for recovery purposes
Define CF cache and lock structures to MVS, using the CF resource manager (CFRM) policy. Define CF cache structures in the SMS base configuration.
Associate CF cache set names with storage class definitions, and write ACS routines to associate storage class definitions that map to CF cache structures with data sets.
Change the attributes for a data set to specify whether the data set is to be recoverable or nonrecoverable. Specify LOG(NONE) if the data set is nonrecoverable; specify LOG(UNDO) or LOG(ALL) if the data set is recoverable.

For more information about using the CFRM policy to define CF structures, see z/OS MVS Setting Up a Sysplex.

For more information about specifying recoverable and nonrecoverable data set attributes, see z/OS DFSMS Using Data Sets.