Analysis of command response (CMR) time detected one or more
control units with an exception.
Explanation
CHECK(IBMIOS,IOS_CMRTIME_MONITOR) determined that
one or more control units had inconsistent command response (CMR)
time. Each of these control units had at least one channel path with
an average CMR time that exceeded the THRESHOLD parameter value and
that path was significantly higher (as defined by the RATIO parameter
value) than the path with the lowest average CMR time for this control
unit. That is, the average CMR time for this path was at least 'x'
times the lowest average CMR time for this control unit (where 'x'
is the RATIO value).
For example, with a THRESHOLD value of
3ms and a RATIO value of 5, this message will be issued when at least
one control unit in the system had a path with an average CMR time
that was the highest among the other paths to the control unit and
met both the following conditions:
- The average CMR time for this path was greater than 3ms.
- The average CMR time for this path was at least 5 times greater
than the path with the lowest average CMR time for this control unit.
This may happen when there is a problem somewhere in the
fabric, such as, hardware errors, I/O mis-configurations, or congestion.
Note: - If parameters have recently been changed, this result may be based
on previously defined parameters. Newly updated parameter values will
be used the next time control unit data is gathered.
- For more information on setting the THRESHOLD and RATIO parameters,
see the section on 'IOS_CMRTIME_MONITOR' in IBM® Health Checker for z/OS® User's Guide.
System action
The system continues processing.
Operator response
Contact the System Programmer.
System programmer response
Refer to the corresponding reports
for this Health Check to determine which control units and channel
paths have delays. Use diagnostic tools (such as the Resource Monitoring
Facility (RMF™) or hardware diagnostics)
to help determine the source of the problem.
Problem determination
Source
Module
Routing code
Descriptor code
Automation
Reference Documentation
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