cancel
Showing results for 
Search instead for 
Did you mean: 

How the availability of a system is calculated?

RajeevP
Advisor
Advisor
0 Kudos

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

Accepted Solutions (1)

Accepted Solutions (1)

paul_power
Active Contributor
0 Kudos

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

RajeevP
Advisor
Advisor
0 Kudos

Thanks Paul.

The note and the information was very helpful. I haven't instalelled the CCMS ping in my machine. Let me install that and try generating SLR based on that.

Thanks once again.

Rajeev

Answers (1)

Answers (1)

RajeevP
Advisor
Advisor
0 Kudos

Hello,

Could anyone please give me any hint on this?

Rajeev

JPReyes
Active Contributor
0 Kudos

As far as I know that data is collected by reading the available.log trace from the work directory.

Regards

Juan