Planning for RLS - VSAM

Planning for RLS
This topic covers planning activities needed to implement RLS.

Hardware requirements
VSAM RLS uses the coupling facility (CF) to perform sphere level locking, record locking, and data caching. If your system is running in a sysplex you already have the necessary hardware to implement VSAM RLS.

If you are going to implement system-managed duplexing for RLS lock structure for improved availability, then you would require additional CF storage, CF processor capacity, and z/OS-to-CF link capacity in order to accommodate duplexed VSAM RLS lock structure instances, and the duplexed VSAM RLS lock structure operations to them from each participating z/OS image.

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VSAM Topics