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Write short notes on: MTBF, MTTR.

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I. Reliability is a measure of how much % you can rely upon the proper functioning of the system or what is the % susceptibility of the system of failures.

 II. Mean time between failures (MTBF) and Mean time to repair (MTTR) are the terms used in defining system reliability.

 III. MTBF gives the frequency of failures in hours/weeks/months.

 IV. MTTR specifies how long the system is allowed to be out of order following a failure.

 V. For an embedded system with critical application need, it should be of the order of minutes.

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