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Consider a RAID-4 disk configuration involving five disks A, B, C, D and E where disk E stores the parity. Examine the folowing six scenarios involving read and write operations in the presence of disk failures in this configuration: 1. All disks are up. There is a write operation on block 10 of disk C. 2. Disk B is down and all other disks are up. There is a read operation on block 20 of disk C. 3. Disk C is down and all other disks are up. There is a read operation on block 30 of disk C. 4. Disk D is down and all other disks are up. There is a write operation on block 40 of disk C. 5. Disk E is down and all other disks are up. There is a read operation on block 50 of disk C. 6. Disk E is down and all other disks are up. There is a write operation on block 60 of disk C. In each of the above scenarios determine how many disk accesses happen in order to process the /O operation. Assume that the goal is to allow as many of the l/O operations as possible, in the presence of disk failures. When counting disk accesses do not count accesses to disks that are down. A. The number of disk accesses for the first scenario is 2. B. The number of disk accesses for the second scenario is 2. C. The number of disk accesses for the first scenario is 1. D. The number of disk accesses for the third scenario is 4.

Consider a RAID-4 disk configuration involving five disks A, B, C, D and E where disk E stores the parity. Examine the folowing six scenarios involving read and write operations in the presence of disk failures in this configuration: 1. All disks are up. There is a write operation on block 10 of disk C. 2. Disk B is down and all other disks are up. There is a read operation on block 20 of disk C. 3. Disk C is down and all other disks are up. There is a read operation on block 30 of disk C. 4. Disk D is down and all other disks are up. There is a write operation on block 40 of disk C. 5. Disk E is down and all other disks are up. There is a read operation on block 50 of disk C. 6. Disk E is down and all other disks are up. There is a write operation on block 60 of disk C. In each of the above scenarios determine how many disk accesses happen in order to process the /O operation. Assume that the goal is to allow as many of the l/O operations as possible, in the presence of disk failures. When counting disk accesses do not count accesses to disks that are down. A. The number of disk accesses for the first scenario is 2. B. The number of disk accesses for the second scenario is 2. C. The number of disk accesses for the first scenario is 1. D. The number of disk accesses for the third scenario is 4.

Operations Research : Applications and Algorithms
Operations Research : Applications and Algorithms
4th Edition
ISBN:9780534380588
Author:Wayne L. Winston
Publisher:Wayne L. Winston
Chapter20: Queuing Theory
Section20.10: Exponential Queues In Series And Open Queuing Networks
Problem 11P
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Consider a RAID-4 disk configuration involving five disks A, B, C, D and E where disk E stores the parity. Examine the following six scenarios involving read and write operations in the presence of disk failures in this configuration: 1. All disks are up. There is a write operation on block 10 of disk C. 2. Disk B is down and all other disks are up. There is a read operation on block 20 of disk C. 3. Disk C is down and all other disks are up. There is a read operation on block 30 of disk C. 4. Disk D is down and all other disks are up. There is a write operation on block 40 of disk C. 5. Disk E is down and all other disks are up. There is a read operation on block 50 of disk C. 6. Disk E is down and all other disks are up. There is a write operation on block 60 of disk C. In each of the above scenarios determine how many disk accesses happen in order to process the I/O operation. Assume that the goal is to allow as many of the I/O operations as possible, in the presence of disk failures. When counting disk accesses do not count accesses to disks that are down. OA. The number of disk accesses for the first scenario is 2. OB. The number of disk accesses for the second scenario is 2. OC. The number of disk accesses for the first scenario is 1. OD. The number of disk accesses for the third scenario is 4.
Transcribed Image Text:Consider a RAID-4 disk configuration involving five disks A, B, C, D and E where disk E stores the parity. Examine the following six scenarios involving read and write operations in the presence of disk failures in this configuration: 1. All disks are up. There is a write operation on block 10 of disk C. 2. Disk B is down and all other disks are up. There is a read operation on block 20 of disk C. 3. Disk C is down and all other disks are up. There is a read operation on block 30 of disk C. 4. Disk D is down and all other disks are up. There is a write operation on block 40 of disk C. 5. Disk E is down and all other disks are up. There is a read operation on block 50 of disk C. 6. Disk E is down and all other disks are up. There is a write operation on block 60 of disk C. In each of the above scenarios determine how many disk accesses happen in order to process the I/O operation. Assume that the goal is to allow as many of the I/O operations as possible, in the presence of disk failures. When counting disk accesses do not count accesses to disks that are down. OA. The number of disk accesses for the first scenario is 2. OB. The number of disk accesses for the second scenario is 2. OC. The number of disk accesses for the first scenario is 1. OD. The number of disk accesses for the third scenario is 4.
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