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A) compute the average time to read or write a 2048 byte sector of d

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a) compute the average time to read or write a 2048-byte
sector of disk rotating at 14000 RPM, given that the seek
time is 3ms, data transfer rate is 20MB/ sec, and controller
overhead is .2ms. Assume there are no pending jobs on
the disk.
b) discuss with the help of necssary figures the disk
storage systems RAID0 through RAID6 and outline the
differences between them with particular emphasis on the
write update schemes of RAID-3 and RAID-4, and
advantageous scenarios for RAID-5 vis-a\'-vis RAID-4.
Solution
a) Ans:
=Average seek time + (0.5/(RPM /60))*1000+sector size
/data transfer rate + controller overhead
=3ms+(0.5/(14000/60))*1000 ms+2KB/20MB/s+2ms
=3+2.14+0.0001+2=14.3ms.
=7.1401ms

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a) compute the average time to read or write a 2048 -byte sector of disk rotating at 14000 RPM, given that the seek time is 3ms, data transfer rate is 20MB/ sec, and controller overhead is .2ms. Assume there are no pending jobs on the disk. b) discuss with the help of necssary figures the disk stora ...
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