XCF_CF_STR_SCM_MINCOUNTS

Description:

Check that the number of structure objects allocated to a structure meets the required minimum for structures that can be duplexed according to the CFRM active policy.

A minimum number of structure objects is required to allocate a structure with a non-zero SCMMAXSIZE. But once allocated, the coupling facility may initiate reapportionment in order to perform migration from SCM (storage-class memory). Such reapportionment may cause a structure object count to go below the minimum.

Reason for check:

When allocating a new structure instance to establish duplexing for a structure that does not currently meet the minimum for a non-zero SCMMAXSIZE, the new structure instance will be allocated with a zero SCMMAXSIZE - a value that is inconsistent with the CFRM policy SCMMAXSIZE value.

z/OS® releases the check applies to:

z/OS V1R13 and later with APAR OA40747.

Parameters accepted:

None.

User override of IBM® values:

The following shows keywords you can use to override check values 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:

UPDATE CHECK(IBMXCF,XCF_CF_STR_SCM_MINCOUNTS)                  
     SEVERITY(LOW) INTERVAL(004:00) DATE(20131007)             
     PARM('')                                                  
     VERBOSE(NO)                                               
     REASON(                                                   
     'Less objects than the minimum required causes secondary '
     'structure allocation for duplexing to be inconsistent '  
     'with the CFRM active policy SCMMAXSIZE.')

Reference:

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

Messages:

This check issues the following exception messages:

IXCH0265E
IXCH0266I
IXCH0930I

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

SECLABEL recommended for MLS users:

SYSLOW