IECH0101E
OPEN macro support for XTIOT, uncaptured UCBs and DSAB above the line is not enabled for non-VSAM. IBM recommends setting NON_VSAM_XTIOT=YES in the DEVSUPxx member of PARMLIB.

Explanation

IBM suggests setting NON_VSAM_XTIOT=YES in the DEVSUPxx member of PARMLIB to decrease the chances of running out of virtual storage when allocating and concurrently opening many sequential and partitioned data sets.

System action

The system continues processing.

Operator response

N/A

System programmer response

Encourage the use of XTIOT allocations.

Problem determination

N/A

Source

DFSMS OPEN/CLOSE/EOV

Module

IFGHCOC2

Routing code

See note 35.

Descriptor code

12 is the default set by this check. See note 1.

Automation

N/A

Reference Documentation

For additional information see z/OS MVS Initialization and Tuning Reference.