VSM_SQA_LIMIT

Description:

The current size of SQA against a minimum suggested value.

Reason for check:

The total amount of virtual storage and number of private virtual storage address spaces affect the system's use of SQA. Like CSA, SQA size is determined by the operator or the system parameter list. When SQA falls below a threshold, a critical storage message is issued, new jobs cannot be created, and address spaces cannot be swapped in until the shortage is alleviated. If the size allocated for extended SQA is too small or is used up very quickly, the system attempts to use extended CSA. When both extended SQA and extended CSA are used up, the system allocates space from SQA and CSA below 16 megabytes. The allocation of this storage could eventually lead to a system failure.

z/OS® releases the check applies to:

z/OS V1R4 and later, in both ESA and z/Architecture® modes.

Parameters accepted:

Number of bytes with optional suffix (K,M) indicating the minimum amount of below the line SQA required on the system (keyword: SQA)
Number of bytes with optional suffix (K,M) indicating the minimum amount of above the line SQA required on the system (keyword: ESQA)
Default: SQA(512K),ESQA(8M)

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:

UPDATE,
CHECK(IBMVSM,VSM_SQA_LIMIT),
INTERVAL(ONETIME),
SEVERITY(LOW),
PARM('SQA(512K),ESQA(8M)'),
DATE('date_of_the_change')

Reference:

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

Messages:

This check issues the following exception messages:

IGVH101E

See the IGVH messages in z/OS MVS System Messages, Vol 9 (IGF-IWM).

SECLABEL recommended for multilevel security users:

SYSLOW - see z/OS Planning for Multilevel Security and the Common Criteria for information on using SECLABELs.