Improvement in io performance of user programs

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Task:1 From which state transition a process will undergo through when a process that executes a READ instruction for a data record currently on disk? Will it be a "Running to blocked" state or "Blocked to Running"? Elaborate your answer.

Task:2 Consider an Operating System capable of loading and executing a single sequential user process at a time. The disk head scheduling algorithm used in FCFS. If FCFS is replaced by SSTF(Shortest Seek Time First), claimed by the vendor to get 50% better benchmark results, what is the expected improvement in the I/O performance of user programs?

Task:3 In SCAN algorithm the disk arm moves into a direction and services the requests coming in its path and after reaching the end of disk, it reverses its direction and again services the request arriving in its path. So, this algorithm works as an elevator and hence also known as elevator algorithm. As a result, the requests at the midrange are serviced more and those arriving behind the disk arm will have to wait. Discuss what could be the advantages and disadvantages for this algorithm.

Reference no: EM132693748

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