CSVTAM_CSM_STG

Description:

Checks if the maximum bytes of fixed storage dedicated to CSM use and the maximum amount of storage dedicated to ECSA CSM buffers is adequate to meet the needs of your system.

Reason for check:

The default values for IVTPRM00 are 100 MEG for both FIXED, and ECSA. It is suggested that they initially be coded at 100M MAX ECSA and 100M MAX FIXED. Then the system should be monitored for one week using the DISPLAY CSM command to determine peak usage. IVTPRM00 MAX ECSA and MAX FIXED values should then be adjusted to 1.5 times the highest value indicated in the DISPLAY CSM outputs.

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(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(100M)
MAXECSA - Integer value with optional suffix (K,M) indicating the maximum amount of storage dedicated to ECSA CSM buffers. Default: MAXECSA(100M)

Values for both parameters must be in the range between 1024K to 2048M.

Reference:

For more information on defining the maximum bytes of fixed storage dedicated to CSM use and the maximum amount of storage dedicated to ECSA CSM buffers, 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.