SMSVSAM operation of mixed mode

SMSVSAM permits a data set to be opened in different modes concurrently, by different applications in a sysplex.

There are some sharing rules and limitations:

A data set that is open in RLS mode to a number of CICS regions can also be opened in non-RLS mode for read-only operations
Read-integrity is not guaranteed for the non-RLS application
A data set to be opened concurrently in RLS and non-RLS mode must be defined with cross-region SHAREOPTIONS(2)