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)
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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)?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F3316840f-2811-49a3-93c3-908592b89a60%2Fe36e0728-2679-46d9-9172-7622fe0ba04b%2Fpftmwqt_processed.jpeg&w=3840&q=75)
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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