Adapting Specific Parameters to the Sending Block

You must align the following specific parameters with the maximum size of a sending block, otherwise an internal IMS segmentation will take place or the system will terminate.

IMS generation parameters:

COMM : RECANY=(4,8192) SIZE RECEIVE-ANY BUFFERS
TERMINAL: OUTBUF=8192 (IMS SEND)
TRANSACT: SEGSIZE=00000 (no limit)
MSGQUEUE: RECLNG=(512,8192) LRECL SHMSG+LGMSG

SAP installation parameters:

SAPZCSA : ZCSAMSGL=16384 (internal SAP BUFFER)

For the values detailed, the headers used internally by IMS are ignored.

The length of the internal SAP buffer selected should be at least twice that of the IMS parameter. It should also be aligned to word length.