Question
Answer part c

Hard Drive Power Supply Fan System Board (1) System Board (2) 99.999 99.995 99.992 99.840 99.840 99.840 99.998 99.996 99995 .99992 99840 99840 System Board (3) 99840 99998 99996 CPU NIC a. What is the availability percentage of the entire system (to three decimal places)? 99.500 We can deploy systems in parallel to increase availability. Calculate the availability we get by deploying two of the systems in parallel (to three decimal places). b. Calculate the availability we get by deploying three of the systems in parallel (to three decimal places). c.
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Answer #1

Answering for part(c) as asked:

Three parts are considered to be operating in parallel if the combination is considered failed when all parts fail. The combined system is operational if atleast one is available. From this it follows that the combined availability is 1 - (all parts are unavailable).

The combined availability for system boards (say x) is shown by the equation below:
A = 1 _ (1-Ar)3-1-(1-0.998403-0.999999996

Thus for the entire system, the availability comes out to be:

=(0.99999)(0.99995)(0.99992)(0.999999996)(0.99998)(0.99996)=0.999800010500330

This can be shortened upto three decimal places as per the standard usage at the user end by either dropping the 4th digit (0.999) or by rounding it off (1).

Hope this helps! PLEASE THUMBS UP!!!!!!!!!!!!

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