Suppose that we build a disk subsystem to handle a high rate of /O by coupling many disks together. Properties of this system are as follows: • Uses 10 GB disks that rotate at 10,000 RPM, have a data transfer rate of 10 MBytes/s (for each disk), and have an 8 ms average seek time, 32 KByte block size • Has a SCSI interface with a 2ms controller command time. • Is limited only by the disks (assume that no other factors affect performance). • Has a total of 20 disks Each disk can handle only one request at a time, but each disk in the systen can be handling a different request. The data is not striped (all /O for each request has to go to one disk). What is the average service time to retrieve a single disk block from a random location on a single disk, assuming no queuing time (i.e. the unloaded request time)?

Suppose that we build a disk subsystem to handle a high rate of /O by coupling many disks together. Properties of this system are as follows: • Uses 10 GB disks that rotate at 10,000 RPM, have a data transfer rate of 10 MBytes/s (for each disk), and have an 8 ms average seek time, 32 KByte block size • Has a SCSI interface with a 2ms controller command time. • Is limited only by the disks (assume that no other factors affect performance). • Has a total of 20 disks Each disk can handle only one request at a time, but each disk in the systen can be handling a different request. The data is not striped (all /O for each request has to go to one disk). What is the average service time to retrieve a single disk block from a random location on a single disk, assuming no queuing time (i.e. the unloaded request time)?

Computer Networking: A Top-Down Approach (7th Edition)

7th Edition

ISBN:9780133594140

Author:James Kurose, Keith Ross

Publisher:James Kurose, Keith Ross

Chapter1: Computer Networks And The Internet

Section: Chapter Questions

Problem R1RQ: What is the difference between a host and an end system? List several different types of end...

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