z/OS V2R1 introduces the following enhancements for VSAM and VSAM
RLS:
- The restriction that data sets accessed by VSAM RLS could not
use dynamic volume count is removed. Dynamic volume count enables
the dynamic addition of volumes to a DASD data set without increasing
the number of candidate volumes stored in the catalog.
- The SHOWCB macro has added two new sub-parameters, BUFNOL and
BUFUSE. These enhancements are used to display fields of an Access
Method Control Block (ACB).
- A new data set attribute identifies whether a data set is eligible
for VSAM replication.
- Expanded and new keywords for specifying record access
bias and ACB RMODE31 values for a data class.
The following table lists the types of tasks and associated procedures
that you must complete to fully use these enhancements.