on 03-05-2010 6:33 PM
Hello all,
Could you please let me know how the availability of a system is calculted? I have generated the EWA report for one of my production system and the report says that my systems availability is 40%. But my system wasn't down for the whole week. Could you please help me to understand how this calcuatiion is done? Any document existing for this?
Thanks and Regards,
Rajeev
Hello Rajeev,
Are you using CCMSPING for accurate for accurate reporting of
System Availability?
The "Avg. availibility per week" (as an example of how early watch
checks the system availability) is derived from the logs of the SAP
Performance Collector (report RSCOLL00).
If the logs are available for the whole day, it is assumed also that the system
(with at least one application instance) was available for the whole day.
So it may be that if the log were not available at some point in time or the sapcol didn't run on
occassion, despite the system being up 100% of the time, the avail-
ability will not report as >99%. And this will not generate an error.
The ST03 Collectors tries to aggregate certain checks on the server
and instance, and really isn't measuring system availability.
This is why SAP's recommendation is to use CCMSPING for accurate
reporting of system avaiolability. If you are not using CCMSPING,
please reference SAP note 1332677.
Regards,
Paul
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Hello,
Could anyone please give me any hint on this?
Rajeev
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