Setting up VSAM RLS support

These topics provide an overview of each task you need to perform if you want to use VSAM RLS to enable CICS® regions to share VSAM data sets.

Defining the main coupling facility lock structure
VSAM RLS support requires the coupling facility to define a main lock structure, IGWLOCK00, for cross-system locking. You can also optionally create up to 256 secondary lock sets per sysplex.
Defining coupling facility cache structures and cache sets
VSAM RLS support requires the coupling facility to define cache structures for cross-system buffer invalidation. You determine the number and size of cache structures you require.
Preparing for RLS access
You need to define SMS storage classes and alter data set attributes to prepare for VSAM RLS access.
Defining sharing control data sets
VSAM RLS requires sharing control data sets. These are used to maintain data integrity in the sharing environment. The sharing control data set is used sysplex-wide by all the SMSVSAM servers, and is always duplexed.
Authorizing CICS user IDs for VSAM RLS support
Authorize each CICS user ID that is to use VSAM RLS support to have read access to a profile in the SUBSYSNM class that matches the APPLID.
Adding new parameters to SYS1.PARMLIB(IGDSMSxx)
To include RLS support in your system, specify the required parameters in the IGDSMSxx member of SYS1.PARMLIB.
Establishing new procedures for VSAM RLS support
You might require new operational procedures in a number of areas as a result of using VSAM RLS support, including integrity of data and management of coupling facilities and structures, use of RESERVEs, switching to non-RLS mode and forward recovery management.
Activating the coupling facility structures
After you have defined the main coupling facility lock structure and coupling facility structures in the CFRM policy, activate the structures using the SETXCF START POLICY command, specifying a TYPE of CFRM and the policy name.

Parent topic: Setting up the MVS environment for CICS