z/OS® V2R1 adds the following
PDSE enhancements:
- Increased PDSE member size limits. The maximum PDSE member size
increases from 15 728 639 records to 2 146 435 071
records. The larger size limit applies to PDSEs being accessed with
various sets of characteristics, including DSORG and MACRF values,
whether they are open for input or output, and whether BLOCKTOKENSIZE=LARGE
is specified. For a list of the PDSE access characteristics that support
the larger member size limit, see the topic on "PDSE member size
limits" in z/OS DFSMS Using Data Sets.
- New PDSE version. z/OS V2R1
introduces a new version of PDSE data sets that can provide for improved
performance, reduced path lengths, and improved index searches. New
data sets can be allocated as belonging to the new version (version
2) by specifying a new positional parameter in the DSNTYPE keyword
of the DD statement or TSO/E ALLOCATE command, or by specifying a
new PARMLIB option (PDSE_VERSION) in IGDSMSnn members. Unless
version 2 is specified, new allocations continue to create the current
version 1 PDSE data sets. Externally, version 1 and version 2 PDSEs
look the same, and both versions can be open for input/output with
no changes for the users. For more information about the new PDSE
version and how to specify it, see the topic "PDSE Version"
in z/OS DFSMS Using Data Sets.