Disk Question

Completed Posted Jun 6, 2003 Paid on delivery
Completed Paid on delivery

Consider a magnetic disk with 64 sectors per track, a sector size of 1KB and a rotation of 7200RPM. Assume that the average seek time is 6 ms, and that the disk controller has an associated average delay of 1ms. Assume that there are no other overheads. (a) Calculate the total capacity in MB of a single disk of the type described above, if that disk has 128 tracks per disk surface and 20 disk surfaces. (b) If each I/O request to this disk was a random read request of 4KB, how much I/O requests can be performed per second in this disk? (c) If we now build an array using five of these disks, and “stripe?? the data across four disks and make the fifth disk the parity disk, how will read performance be affected, compared to a single disk? How will write performance be affected? (d) Instead of restricting parity information to the fifth disk, if we distribute the parity across all five disks, how will read performance be affected compared to a single disk? What about write performance?

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Engineering MySQL PHP Software Architecture Software Testing Web Hosting Website Management Website Testing

Project ID: #2942536

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1 proposal Remote project Active Jun 7, 2003

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