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ISGLOCK structure request processing z/OS MVS Planning: Global Resource Serialization SA23-1389-00 |
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Infrequently, there are situations that can cause requests to the
ISGLOCK structure to be left in an incomplete state. When this
occurs, resource requests for those resources that have been hung
up will never complete, holding up the requesters indefinitely. The
DISPLAY GRS,CONTENTION command provides information regarding resources
and requesters that might be in this state. To determine if there
is a problem with request processing, you should issue the command
on all systems in the sysplex, because the data required to determine
the condition is located on each system. When the system is running
correctly, the response to the DISPLAY GRS,CONTENTION command, message
ISG343I, will look as follows:
When there is a potential problem, the command will indicate the
resource and requesters associated with the hung resources. Potentially
hung resources are noted by the indication of a delay of more than
two seconds in response time. If this text does not appear, the
request might still be active, and the appearance in the output is
not indicative of a problem. However, if the situation persists,
the number of hung requesters will increase. To correct the situation,
rebuild the ISGLOCK structure with the SETXCF START,REBUILD,STRNAME=ISGLOCK.
An example of the output from the DISPLAY GRS,CONTENTION command
when there might be a problem is presented below:
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