RRS_RMDataLogDuplexMode

Description:

The duplexing scheme used to protect the RM Data log stream is evaluated.

Reason for check:

Choose a duplexing scheme more reliable than local buffer duplexing for the RM Data log stream. For example, choose to use staging data sets. Why? Because local buffer duplexing can result in a loss of data in the log stream if both the CF and the local buffers are on the same machine. A loss of data in the RRS RM Data log stream will eventually require an RRS cold start to repair the log stream and may also require a cold start of any resource manager using RRS at the time of the RRS cold start. For more details on protecting log streams, see z/OS MVS Programming: Resource Recovery.

z/OS® releases the check applies to:

z/OS V1R4 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(IBMRRS,RRS_RMDATALOGDUPLEXMODE)                               
    SEVERITY(MEDIUM),INTERVAL(8:00),DATE('date_of_the_change')
    REASON('Your reason for making the update.')

Parameters accepted:

Reference:

For more information, see z/OS MVS Programming: Resource Recovery.

Messages:

This check issues the following exception messages:

ATRH01E

See the ATRH messages in z/OS MVS System Messages, Vol 3 (ASB-BPX).

SECLABEL recommended for multilevel security users:

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