IBM SC34-7012-01 manual Failing to register, ARM couple data sets, Cics restart JCL and parameters

CANCEL, CICS de-registers from ARM before terminating, because if CICS remained registered, an automatic restart would probably encounter the same error condition.

For other error situations, CICS does not de-register, and automatic restarts follow. To control the number of restarts, specify in your ARM policy the number of times ARM is to restart a failed CICS region.

Failing to register

If ARM support is present but the register fails, CICS issues message DFHKE0401. In this case, CICS does not know if it is being restarted by ARM, and therefore it doesn’t know whether to override the START parameter to force an emergency restart to preserve data integrity.

If START=COLD or START=INITIAL is specified as a system initialization parameter and CICS fails to register, CICS also issues message DFHKE0408. When CICS is restarting with START=COLD or START=INITIAL, CICS relies on ARM to determine whether to override the start type and change it to AUTO. Because the REGISTER has failed, CICS cannot determine whether the region is being restarted by ARM, and so does not know whether to override the start type. Message DFHKE0408 prompts the operator to reply ASIS or AUTO, to indicate the type of start CICS is to perform:

vA reply of ASIS means that CICS is to perform the start specified on the START parameter.

vA reply of AUTO means that CICS is being restarted by ARM, and the type of start is to be resolved by CICS. If the previous run terminated abnormally, CICS will perform an emergency restart.

Note: A CICS restart can have been initiated by ARM, even though CICS registration with ARM has failed in the restarted CICS.

ARM couple data sets

You must ensure that you define the couple data sets required for ARM and that they are online and active before you start any CICS region for which you want ARM support.

vCICS automatic ARM registration fails if the couple data sets are not active at CICS startup. When CICS is notified by ARM that registration has failed for this reason, CICS assumes this means that you do not want ARM support, and CICS initialization continues.

vIf ARM loses access to the couple data sets, the CICS registration is lost. In this event, ARM cannot restart a CICS region that fails.

See z/OS MVS Setting Up a Sysplex for information about ARM couple data sets and ARM policies.

CICS restart JCL and parameters

Each CICS restart can use the previous startup JCL and system initialization parameters, or can use a new job and parameters.

You cannot specify XRF=YES if you want to use ARM support. If the XRF system initialization parameter is changed to XRF=YES for a CICS region being restarted by ARM, CICS issues message DFHKE0407 to the console, then terminates.

Chapter 7. Automatic restart management 69