Question 22 In RAID, ____ improves read performance by breaking a large read operation into smaller parallel read operations.
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This is a key characteristic of RAID levels that use striping. Show more…
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Three ways to improve the performance of a hard disk include: a. disk caching, RAID.and file compression. b. RAID.file compression and disk expansion. c. disk caching, RAID.and file expansion. d. file compression, disk caching, and file encryption.
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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 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. A. The number of disk accesses for the second scenario is 2. B. The number of disk accesses for the first 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.
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Suppose we are using a RAID level 4 scheme with four data disks and one redundant disk. As in Example 13.9 assume blocks are a single byte. Give the block of the redundant disk if the corresponding blocks of the data disks are: a) 01010110,11000000, 00111011, and 11111011. b) 11110000, 11111000, 00111111, and 00000001.
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