Making jobs eligible to restart

When a checkpoint data set resides on a coupling facility structure instead of on a DASD volume, neither the software checkpoint lock nor the hardware lock are set. Therefore, neither lock has to be released. However, the jobs from the failed processor must be requeued for execution on an active member of the MAS.

When a JES2 member of a MAS configuration fails while holding the software checkpoint lock, other members within the configuration cannot access the checkpoint data set. JES2 issues the message:

$HASP264 WAITING FOR RELEASE OF JES2 CKPT LOCK BY memname.

To make jobs from a failed JES2 member eligible for restart on another member when both the MVS™ system and the JES2 subsystem fail, the hardware lock (if held) must be reset and the software checkpoint lock must be reset. If the JES2 subsystem fails and the MVS system continues to run jobs, reset the software lock and restart the JES2 subsystem. After resetting both the hardware and the software checkpoint lock, jobs become eligible for restart:

Through the use of operator commands.
Through the use of the AUTOEMEM option.

Using operator commands: To make jobs eligible for restart without the AUTOEMEM option (when the JES2 checkpoint data set resides on DASD) an operator must:

Reset the hardware checkpoint lock.
Enter the $E CKPTLOCK, HELDBY= command to reset the software checkpoint lock, if it is held by the failed member.
Enter the $E MEMBER(member) to requeue jobs for restart on another JES2 MAS member.

Note: When a checkpoint resides on a coupling facility structure, you must still enter the $E MEMBER(member) to requeue jobs.

Using the AUTOEMEM Option: In a sysplex, JES2 members of a MAS can take advantage of the AUTOEMEM option to make jobs eligible for restart, with minimal operator intervention. The option can be specified on the MASDEF initialization statement (or dynamically through the $T MASDEF command):

AUTOEMEM=YES
RESTART=YES|NO

For a more complete understanding of the AUTOEMEM option, see z/OS JES2 Initialization and Tuning Guide, SA32-0991.