What is the purpose of parity information in RAID systems? Group of answer choices To allow for data recovery in case of disk failure To improve disk performance To encrypt data for security To compress data to save storage space
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RAID is a technology that combines multiple physical disk drive components into a single logical unit for data redundancy, performance improvement, or both. Show more…
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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.
Akash M.
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