Question

Which components constitute the disk service time? Which components constitute the largest percentage of the disk service time in a random I/o operation?

Answer 1

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Answer 2

The components constituting the disk service time are Seek time, rotational latency and data transfer rate.

The large percentage of the disk service time in a random I/o operation is constituted by seek time.

    (1) Seek Time :

• Disk drive takes time to locate the area on the disk where the data which is to be read, needs to be stored.
• Seek time takes most of the disk service time.

    (2) Rotational latency:

• It also known as rotational delay, is the delay in waiting for the disk to rotate and to bring the required disk sector under the read-write head.

    (3) Data transfer rate :

• It is the amount of the data that is transferred from one point to other in a given amount of time.