Add to the maximum number of open files under z/OS UNIX Systems Services for PFA

Description: Starting in z/OS V1R13, Predictive Failure Analysis (PFA) has two additional checks, PFA_JES_SPOOL_USAGE and PFA_ENQUEUE_REQUEST_RATE. These additional checks add to the number of open files for the PFA started task id.

Element or feature:

BCP.

When change was introduced:

z/OS® V1R13.

Applies to migration from:

z/OS V1R12.

Timing:

After the first IPL of z/OS V1R13 and before the start of PFA.

Is the migration action required?

Yes, if you use PFA and MAXFILEPROC is less than 5000.

Target system hardware requirements:

None.

Target system software requirements:

None.

Other system (coexistence or fallback) requirements:

None.

Restrictions:

None.

System impacts:

None.

Related IBM® Health Checker for z/OS check:

None.

Steps to take: PFA requires the maximum number of open files under z/OS UNIX System Services to be 5000 or greater. You can increase the value in one of two ways. The first option is preferable:

Update the FILEPROCMAX field in the OMVS segment of the PFA started task id, for example:
```
TSO ALU pfauser  OMVS(FILEPROCMAX(5000))
```
Update the BPXPRMxx MAXFILEPROC value in the parmlib member BPXPRMxx.

Reference information: For more information about the MAXFILEPROC value, see z/OS MVS Initialization and Tuning Reference.

For information about FILEPROCMAX, see z/OS MVS Diagnosis: Tools and Service Aids