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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)
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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CO. Task 11.2 The surface of a platter is organised as a number of concentre, track. Fach track in divided into sectors The information held in one sector called as a block, is the unit of tranefer between the disk and primary memory. The operating system determines where the blocks for each file are placed. Read/write head (1 per surface) Track 1 Spindle Surface 7 Arm assembly Surface 6 Sector Surface 5 Surface 4 Cylinder Read-write head Drection of Arm Moton Surface 3 Surface 2 Platter Surface 1v Arm Rotation Physical View Multiple Platter Disk Structure Logical View Suppose that we build a disk subsystem to handle a high rate of /0 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 system can be handling a different request. The data is not striped (all 1/0 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)?
Transcribed Image Text:CO. Task 11.2 The surface of a platter is organised as a number of concentre, track. Fach track in divided into sectors The information held in one sector called as a block, is the unit of tranefer between the disk and primary memory. The operating system determines where the blocks for each file are placed. Read/write head (1 per surface) Track 1 Spindle Surface 7 Arm assembly Surface 6 Sector Surface 5 Surface 4 Cylinder Read-write head Drection of Arm Moton Surface 3 Surface 2 Platter Surface 1v Arm Rotation Physical View Multiple Platter Disk Structure Logical View Suppose that we build a disk subsystem to handle a high rate of /0 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 system can be handling a different request. The data is not striped (all 1/0 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)?
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