HSM_CDSB_VALID

Description:

Determines if number of valid Control Data Set (CDS) backups has fallen below a critical level.

This check is registered with IBM® Health Checker for z/OS® when the MAIN DFSMShsm host initializes on a z/OS image for the first time since IPL.

The check will run after a MAIN DFSMShsm host initializes, the CDS backup function completes on a MAIN or AUX host, a SETSYS CDSVERSIONBACKUP is issued to a MAIN or AUX DFSMShsm host(SETSYS CDSVERSIONBACKUP commands processed during MAIN host initializatin will not cause the checks to run).

This check requires a MAIN DFSMShsm host to be active on the z/OS image. If this check runs while a MAIN DFSMShsm host is not active, the check will be disabled until a MAIN host initializes.

For multi-cluster CDS's, all cluster backups for a version must be valid before the version is considered a valid backup.

Reason for check:

It is recommended that DFSMShsm maintain a minimum of 4 CDS backups. This practice greatly minimizes the exposure of all valid backups rolling off over the course of an extended off-shift period such as a three-day weekend.

z/OS releases the check applies to:

z/OS V1R7 and later.

User override of IBM values:

The following shows keywords you can use to override check values 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(IBMHSM,HSM_CDS_VALID_BACKUPS)
  SEVERITY(MED) INTERVAL(24:00) PARM('CRITVAL(4)')
  DATE(20071031)
  REASON('YOUR REASON FOR MAKING AN UPDATE.')

Parameters accepted:

Yes. The critical value of backups to check for can be adjusted. For example, PARM('CRITVAL(10)').

Default: 4 Maximum: 9999

Note that specifying a value of 0 means the check will run but will not issue an exception.

Verbose support:

Debug support:

Reference:

For more information on DFSMShsm CDS Backup, see the following:

Messages:

This check issues the following exception messages:

ARCHC0108E
ARCHC0115E

See the ARCH messages in z/OS MVS System Messages, Vol 2 (ARC-ASA). .

SECLABEL recommended for multilevel security users:

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