Question: ( 5 . 2 0 . 1 3 ) Mean time between failures ( MTBF ) , mean time to replacement ( MTTR ) ,

(5.20.13)

Mean time between failures

(

MTBF

),

mean time to replacement

(

MTTR

),

and mean time to failure

(

MTTF

)

are useful metrics for evaluating the reliability and availability of a storage resource. Explore these concepts by answering the questions about a device with the following metrics:

Calculate the MTBF for such a device.

Calculate the availability for such a device.

What happens to availability as the MTTR approaches

0 ?

Is this a realistic situation?

What happens to availability as the MTTR gets very high, i

.

.,

a device is difficult to repair? Does this imply the device has low availability?

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