ASM_NUMBER_LOCAL

Description:

Checks on the number of usable local page data sets. The check generates an exception if the number is below the recommended value of 3. This is a one-time check that is also run whenever a page data set is dynamically added or deleted.

Reason for check:

Running with a sufficient number of usable paging data sets ensures that paging I/O is distributed over multiple devices which enhances paging throughput.

z/OS® releases the check applies to:

z/OS V1R8 and later.

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(IBMASM,ASM_NUMBER_LOCAL_DATASETS),
        INTERVAL(ONETIME),
        SEVERITY(LOW),
        PARM('MINLOCALS(3)'),
        DATE('date_of_the_change')

Debug support:

Verbose support:

Parameters accepted:

Yes, in keyword MINLOCALS, which is an integer, 1-255, indicating the recommended minimum number of usable local page data sets. The default is 3.

Reference:

For information on auxiliary storage management, see z/OS MVS Initialization and Tuning Guide .

Messages:

This check issues the following exception messages:

ILRH0101E

See the ILRH 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.