Serviced under the scheduling policies

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Consider a disk with n cylinders numbered sequentially 0, 1, 2,...., n-1. The unit has just finished servicing requests on cylinder 120 and has moved to cylinder 173. The queue of requests to be serviced is as follows:

173, 89, 1370, 933, 1674, 1048, 1419, 1122, 1652, 136

Where 173 is the oldest request and 136 is the latest arrival.

a) In what order will the cylinders be serviced under the following scheduling policies?

FIFO 

SSTF

SCAN

b) What will be the distance (number of cylinders) traveled by the R/W head under each policy?

FIFO

SSTF

SCAN

Reference no: EM132298014

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