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Regard as hierarchical network of data centers networks and suppose that data center needs to support e-mail and video distribution among other applications. Assume 4 racks of servers are reserved for e-mail and four racks are reserved for video. For each of application, all 4 racks must lie below a single tier-2 switch since the tier-2to tier-1 links do not have sufficient bandwidth to support intra-application traffic. For the e-mail application, suppose that for 99.9% of the time only three racks are used, and that the video application has identical usage patterns.

a. For what fraction of time does e-mail application need to use a fourth rack?

b. assume e-mail usage and video usage are independent, for what fraction of time do (equivalently, what is the probability that) both applications need their fourth rack?

c. assume that it is acceptable for an application to have a shortage of servers for 0.001 percent of time or less (causing rare periods of performance degradation for users). Discuss how the topology can be used so that only 7 racks are collectively assigned to the 7 applications (assuming that the topology can support all the traffic).

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Computer Engineering, Engineering

Category:- Computer Engineering
Reference No.:- M9133496

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