XCF_CF_PROCESSORS

Description:

This check provides a warning when a coupling facility processor configuration is not consistent with IBM® recommendations and may result in degraded response time and throughput possible for coupling facility requests as compared to coupling facilities configured for the best performance and throughput based on the coupling facility architected function level (CFLEVEL).

This check provides a parameter to enable the installation to specify names of CFs whose processor configurations should be excluded from the determination of the overall status of the check. The installation may wish to exclude non-production CFs or CFs that are running in ‘test’ mode with shared processors.

Start of change This check does not raise an EXCEPTION for a coupling facility that is enabled to use coupling thin interrupts. Coupling facilites at CFLEVEL 19 or above are capable of exploiting coupling thin interrupts. End of change

Because CF processors can not be configured as dedicated processors in a VM environment, this check is not applicable when a z/OS® image is running as a guest under VM and is disabled from running.

This is a local check.

Reason for check:

CF performance (as measured in service time) is degraded with shared CF central processors.

z/OS releases the check applies to:

z/OS V1R12 and later.

Parameters accepted:

EXCLUDE is a required parameter where you can specify a list of CFNames that the check should not consider in its verification processing. A CF named in the EXCLUDE list indicates that the check should not include the processor configuration for that CF in determining the overall check status. Processor configurations for excluded CFs will be reported on in message IXCH0912I and the report will indicate that the check results for the excluded CFNAME were not factored into the overall check status.

Specifiying EXCLUDE() will exclude no coupling facilities from the check verification process.

User override of IBM values:

The following shows the default keywords for the check, which you can override on either a POLICY statement in the HZSPRMxx parmlib member or on a MODIFY command. This statement may be copied and modified to override the check defaults: Start of change

UPDATE CHECK(IBMXCF,XCF_CF_PROCESSORS)
       SEVERITY(MED) INTERVAL(004:00) DATE (20090707)
       PARM('EXCLUDE(CFname,CFname)')
       REASON('Your reason for making the update.')

Reference:

For more information, see z/OS MVS Setting Up a Sysplex.

Messages:

This check issues the following exception messages:

IXCH0444E
IXCH0912I

See the IXCH messages in z/OS MVS System Messages, Vol 10 (IXC-IZP).

SECLABEL recommended for MLS users:

SYSLOW