Upgrading to IBM Sterling Connect:Direct for z/OS 5.2.0? Check out the new Initialization Parameter default values.

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The new IBM Sterling Connect:Direct for z/OS 5.2.0 release has introduced more realistic Initialization Parameter defaults. In many cases, you may already use these values as a Best Practice. But some defaults may change the way your system operates.

We recommend that you review your current settings and decide if the new defaults fit your processing needs.

All 5.2.0 documentation is now available in our IBM Knowledge Center, so you can see the details here in the Release Notes and Administration Guide: https://www-01.ibm.com/support/knowledgecenter/SSFGBN_5.2.0/kc_welcome-444.html

Here is a list of the new default values taken from the Release Notes:

DEBUG = 00200000

TCP.TIMER = 300

TCP.FMH.TIMER = 10

TCP.CONNECT.TIMEOUT= 30

V2.BUFSIZE = (32K,128K)

CHECK.CERT.EXPIRE = YES

CKPT = 10M

NON.SWAPABLE = YES

STAT.QUEUE.ELEMENTS = 1500

STRNO.MSG = 10

TAPEIO = BSAM

GDGALLOC = GENERATION

INVOKE.ALLOC.EXIT.ON.RESTART = YES

INVOKE.ALLOC.EXIT = BOTH

REQUEUE = YES

Of these changes, here are a few that may interest you.

Allow all dumps to be processed. Before, duplicate dumps could be suppressed, making analysis more difficult:

DEBUG = 00200000

Improve TCP issues and prevent hung sessions:

TCP.TIMER = 300

TCP.FMH.TIMER = 10

TCP.CONNECT.TIMEOUT= 30

Checkpointing is now turned on by default:

CKPT = 10M

More efficient transmission buffer size:

V2.BUFSIZE = (32K,128K)

Prevent issues with GDG's when multiple processes write to the same base.

GDGALLOC = GENERATION