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Setting the TOD clock accuracy monitor service z/OS MVS Planning: Operations SA23-1390-00 |
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The TOD clock accuracy monitor service allows the specification
of an acceptable time deviation for the TOD clock from the current
external time source (ETS). This service is disabled unless a non-zero
value is specified for the ACCURACY parameter in the active CLOCKxx member
of SYS1.PARMLIB. This service is activated only if the CEC is operating
in an STP-only Coordinated Timing Network (CTN) using one of the following
External Timing Sources (ETS) as the source of time:
Note: The ACCURACY value specified is with respect to the ETS
time, which may deviate from Universal Coordinated Time (UTC) by a
small amount. See section 2.3 of Server Time Protocol Planning
Guide Redbook, SG24-7280, for additional details of the ETS accuracies.
If the ACCURACY value is non-zero and the system requirements are met, message IEA034I 'THE TOD CLOCK ACCURACY MONITOR IS ACTIVE' is issued. If the ACCURACY value is non-zero, but the system requirements are not met, message IEA036I 'THE TOD CLOCK ACCURACY MONITOR IS NOT ACTIVE' is issued at IPL. If the TOD clock exceeds +/- the ACCURACY value, message IEA032E
'TOD CLOCK ACCURACY LIMITS MAY HAVE BEEN EXCEEDED' is issued and then
re-issued every one hour until the condition is corrected. Possible
corrective actions are:
If the TOD clock exceeds +/- the ACCURACY value, but drifts back or is corrected to be within the specified tolerance range, message IEA033I 'THE TOD CLOCK IS NOW WITHIN SPECIFIED ACCURACY BOUNDS' is issued. |
Copyright IBM Corporation 1990, 2014
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