Troubleshooting

MVS allocates the region size specified for the Control‑O monitor unless a local exit (for example, IEALIMIT, IEFUSI, or another MVS or JES exit) is used to limit the region size of jobs and/or started tasks at the site.

Note: Depending on the value of the REGION parameter in the EXEC statement, some MVS versions determine and calculate the amount of the allocated region above the line. In case of doubt, see the EXEC statement in the JCL Reference Guide for your operating system level.

Message IEF374I in the third SYSOUT of the Control‑O monitor indicates the amount of virtual storage used by the Control‑O monitor. Compare the information in this message with the existing region size definition.

• If sufficient virtual storage is not available for the Control‑O monitor, use on-site performance tools to determine if the specified region size was rejected by MVS (for example, using a local exit).
• If MVS accepted the specified region, recalculate the Control‑O monitor’s virtual storage requirements, as shown above, and modify the region size in the EXEC statement of the Control‑O monitor procedure accordingly.
• If an MVS procedure rejected the specified region size, contact your system administrator.