CSVTAM_CSM_STG_LIMIT

Description:

Checks if the maximum amount of storage dedicated to CSM use is adequate to meet the needs of your system. End of change

Reason for check:

The default values for CSM are 200 MEG for FIXED, 100 MEG for ECSA and 2000 MEG for HVCOMM. It is suggested that they be initially coded in IVTPRM00 using the following values: 120M for ECSA, 240M for FIXED and 2000M for HVCOMM. Then the system should be monitored for one week using the DISPLAY CSM command to determine peak usage. IVTPRM00 MAX ECSA, MAX FIXED and MAX HVCOMM values should then be adjusted to 1.5 times the highest value indicated in the DISPLAY CSM outputs. End of change

z/OS® releases the check applies to:

z/OS V1R8 and later.

User override of IBM values:

The following sample shows the defaults for customizable values for this check. Use this sample to make permanent check customizations in an HZSPRMxx parmlib member used at IBM Health Checker for z/OS startup. If you just want a one-time only update to the check defaults, omit the first line (ADDREPLACE POLICY) and use the UPDATE statement on a MODIFY hzsproc command. Note that using non-POLICY UPDATEs in HZSPRMxx can lead to unexpected results and is therefore not recommended. End of change

ADDREPLACE POLICY[(policyname)] [STATEMENT(name)]
UPDATE
CHECK(IBMCS,CSVTAM_CSM_STG_LIMIT)
DATE('date_of_the_change')
REASON('Your reason for making the update.')
ACTIVE 
SEVERITY(LOW) 
INTERVAL(ONETIME)

Debug support:

Verbose support:

Parameters accepted:

Yes:

MAXFIX - Integer value with optional suffix (K,M) indicating the maximum bytes of fixed storage dedicated to CSM use. Default: MAXFIX(200M), the value must be in the range between 1024K to 30720M.
MAXECSA - Integer value with optional suffix (K,M) indicating the maximum amount of storage dedicated to ECSA CSM buffers. Default: MAXECSA(100M), the value must be in the range between 1024K to 2048M.
MAXHVCOMM - Integer value with optional suffix (K,M) indicating the maximum amount of storage dedicated to HVCOMM CSM use. Default: MAXHVCOMM(2000M), the value must be in the range between 100M to 999999M.

Reference:

For more information on defining the maximum amount of storage dedicated to CSM, see IVTPRM00 (Communication Storage Manager) in z/OS MVS Initialization and Tuning Reference.

Messages:

This check issues the following exception messages:

ISTH017E

See z/OS Communications Server: SNA Messages.

SECLABEL recommended for multilevel security users:

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