Colleague of mine noticed the following problem:
Batch jobs are delayed because of SYSVTOC contention.
several jobs are waiting for exclusive use of SYSVTOC volser resource,
the resource is kept by another job.
Sometimes the jobs are waiting for the same volser or there are 2 queues
to two volumes.
The information above comes from ISRDDN ENQ monitor.
The job which is keeping (not waiting) the resource shows no activity (0
I/O, 0% CPU in SDSF).
DASD are shared, z/OS 1.4 in parallel sysplex. CPU consumption is low.
Q:
What is the reason of that ?
What further investigation should be done ?
Any clue ?
--
Radoslaw Skorupka
Lodz, Poland
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