RSM_HVSHARE

Description:

Checks the configured size and current allocation of the high virtual shared area (HVSHARE in IEASYSxx). This check will issue a warning when the allocation of high virtual storage exceeds a predetermined threshold, and/or when the size of the high virtual shared area is less than the default minimum.

Reason for check:

The HVSHARE setting controls the size of the shared area above 2GB, directly affecting how much virtual storage may be shared by jobs on the system. Setting this value too low may cause jobs relying on shared high virtual storage to fail. The default suggested value for this area is 510T.

z/OS® releases the check applies to:

z/OS V1R5 and later in z/Architecture® mode only.

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(IBMRSM,RSM_HVSHARE),
INTERVAL(00:15),
SEVERITY(LOW),
PARM('THRESHOLD(80%),SIZE(510T)'),
DATE('date_of_the_change')

Parameters accepted:

Yes:

An integer, 0-100, indicating the warning threshold percent (keyword: THRESHOLD, percent sign optional)
Number of bytes with optional suffix (K,M,G,T,P,E), indicating shared area size (keyword: SIZE)

Default: THRESHOLD(80%),SIZE(510T)

Reference:

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

Messages:

This check issues the following exception messages:

IARH110E

See the IARH messages in z/OS MVS System Messages, Vol 6 (GOS-IEA).

SECLABEL recommended for multilevel security users:

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