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up to the maximum size when using record I/O. Binary and text I/O with seek
continue to be supported for data sets up to 64K tracks in size on any volume
when opened for read.
• DFSMS support for catalogs with extended addressability (EA) is planned. This will
be designed to make it possible to define and use Integrated Catalog Facility (ICF)
Basic Catalog Structures (BCS) with EA, allowing catalogs larger than 4 GB.
• z/OS Communications Server AT-TLS processing will be designed to provide
reduced CPU usage for encryption and decryption of application data while
improving throughput for some types of workloads. This function is planned to be
automatically enabled.
• VSAM record level sharing (RLS) is planned to support striped data sets. This
will be designed to bring the benefits of VSAM striping, such as allowing single
application requests for records in multiple tracks or control intervals (CIs) to be
satisfied by concurrent I/O requests to multiple volumes. Using striped data sets
can result in improved performance by transferring data at rates greater than can
be achieved using single I/O paths.
• DFSMSdss
will be designed to use larger blocks when possible for DUMP,
TM
COPYDUMP, and RESTORE operations, and to support Extended Format Sequential
dump data sets on DASD for DUMP, RESTORE, and COPYDUMP. The use of larger
block sizes is intended to improve performance for these operations, and using
Extended Format dump data sets is intended to support striping and compression.
• DFSMShsm
will be designed to support parallel processing for recovery from
TM
dump tape volumes when the dumps reside on multiple tape volumes and multiple
tape drives are available. This new function is intended to allow you to specify
that up to 64 concurrent tasks be used to help speed recovery processing. Also,
this is designed to allow you to restore Fast Recovery copy pools from tape using
DFSMShsm.
• PDSE processing is planned to be changed to reduce delays that can occur when
two systems are accessing a PDSE concurrently while it is being updated. PDSE
will be designed to improve its cross-system sharing capabilities, including
member-level sharing, within a GRS complex but outside a Parallel Sysplex. These
changes are intended to make PDSEs more usable outside single-system and
Parallel Sysplex environments.
• DFSMShsm Space Management performance improvements are planned. A new
option will be designed to allow you to specify that Primary Space Management,
Interval Migration, and Command Volume Migration be done in parallel.
• The Catalog address space (CAS) will be designed to check for SYSZTIOT enqueue
contention periodically. Based on an interval you specify and the reason for
contention, CAS will be designed to write a logrec record and a notification
message when tasks have waited longer than the specified interval and contention
checking is active. A new MODIFY CATALOG,CONTENTION command is planned to
allow you to specify a different interval than the 10-minute default or to disable
CAS contention detection. This new function is intended to warn about tasks
that take excessive time to complete, or never complete, from affecting Catalog
performance.
• Language Environment will be designed to improve performance for string
manipulation intensive applications, such as certain applications written in the Perl
language.
• InfoPrint Server for z/OS is planned to enhance Extended Mode processing to
support more SYSOUT data with similar attributes, the maximum number of active
jobs allowed by the job entry subsystem (JES2 or JES3), and Line Printer Daemon
(LPD) support for file sizes up to 4 GB. Support for large file sizes is available
on z/OS V1.9 and higher with the PTF for APAR OA28795. Also, InfoPrint Server
will be designed to prioritize spooling and printing for existing jobs higher than
receiving new work. These changes are intended to help relieve constraints and
reduce spool occupancy for InfoPrint Server jobs.
• Two new services based on existing XCF signaling services are planned to be
introduced to support the use of 64-bit addressable virtual storage message
buffers and associated input and output parameters. The two new services,
IXCMSGOX and IXCMSGIX, are planned to be the 64-bit counterparts of the
existing IXCMSGO and IXCMSGI services. These new services are intended
to make it easier for exploiters to achieve virtual storage constraint relief by
IBM United States Software Announcement
210-008
IBM is a registered trademark of International Business Machines Corporation
10
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