Question

Consider two disk configurations C1 and C2. In C1, a disk A is mirrored by another disk A'. Read operations can access either A or A', while write operations need to modify both A and A'. In particular, serial writes are performed in order to avoid simultaneous corruption of both mirrors, thus protecting against permanent data loss. In C2, disk A is mirrored by two other disks A' and A'', for added protection. Read operations can access any of the three disks while write operations modify all three disks. However, for the sake of higher performance, the write operations are performed in parallel. Let the average read operation on a disk take 5 ms and the average write operation take 10 ms. Consider a sequence of I/O operations consisting of 90 read operations and 10 write operations. Estimate the expected time for processing this sequence of operations in the two configurations. Identify the TRUE statement below, based on the estimate.

Name: consider two disk configurations c1 and c2 in c1 a disk a is mirrored by another disk a read operations can access either a or a while write operations need to modify both a and a in particu 60462
Uploaded: 2023-12-10T00:36:59-08:00
Duration: 2 min 37 s
Channel: Akash M
Description: consider two disk configurations c1 and c2 in c1 a disk a is mirrored by another disk a read operations can access either a or a while write operations need to modify both a and a in particu 60462

          Consider two disk configurations C1 and C2. In C1, a disk A is mirrored by another disk A'. Read operations can access either A or A', while write operations need to modify both A and A'. In particular, serial writes are performed in order to avoid simultaneous corruption of both mirrors, thus protecting against permanent data loss. In C2, disk A is mirrored by two other disks A' and A'', for added protection. Read operations can access any of the three disks while write operations modify all three disks. However, for the sake of higher performance, the write operations are performed in parallel.
Let the average read operation on a disk take 5 ms and the average write operation take 10 ms.
Consider a sequence of I/O operations consisting of 90 read operations and 10 write operations. Estimate the expected time for processing this sequence of operations in the two configurations. Identify the TRUE statement below, based on the estimate.

Added by Allen G.

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