on 12-26-2008 1:19 PM
Sir,
Can anyone tell me the transactions for viewing the Meantime Between Failures (MTBF) and MTTR in SAP PM. How are these calculated in SAP.
Regards,
R. Vijayakumar
hi rajvelu,
look into tcodes :-MCJB,MCJC ,
MTTR :- Lets consider for one month [Sum of breakdown hours/No of breakdowns]
MTBR :- [(Available time - Total breakdown hours)/No of breakdowns]
have a look into this thread for better idea ...here(https://www.sdn.sap.com/irj/scn/forums)
regards
pushpa
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Thanx for the reply
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HI
Check with transaction MCI7 (B/D analysis) for MTTR.(Mean time between repair)
http://help.sap.com/saphelp_47x200/helpdata/en/c1/3762ae449a11d188fe0000e8322f96/frameset.htm
For Evaluation:
Information System ->Report Selection -> Information Systems -> MTTR/MTBR Equipment
Information System -> Report Selection -> Information Systems ->MTTR/MTBR Functional Location
MTBF:
A key characteristic of a hard disk is its "Mean Time Between Failures" (MTBF) given in hours (as an approximate rule, 100,000 hours = 11 years). This is the mean statistical average of the time a disk device operates until it fails. For example, assume a disk device with an MTBF of 50 years. This implies that a company with 25 disks of this brand suffer roughly one disk failure every two years. Statistically there is absolutely no guarantee whatsoever, that one specified disk does not crash within the first week of its life. Statistics only tell you that this event has a comparatively low probability.
Note that there might be a significant difference between the MTBF of one disk spindle itself and the MTBF of a disk system taken as an entity. A disk device contains a lot of components that might all fail. For example, many disk devices contain several disk spindles (JBOD and RAID systems). In this case the total effective MTBF of the device goes down roughly in proportion with the number of spindles in the array.
Specified values of MTBF for a given device are often calculated from the statistics of pure hardware crashes. In reality however, data unavailability can arise from more complex problems that are not included in these figures. Therefore the MTBF can only serve as a guideline to compare pure hardware resilience.
Thanks
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