Question: Suppose we define a RAID's access cost as the number disk accesses divided by the number of data blocks read or written. For each of following configurations and workloads, what is the access cost?
(a) Workload: a series of random 1-block writes Configuration: mirroring
(b) Workload: a series of random 1-block writes Configuration: distributed parity
(c) Workload: a series of random 1-block reads Configuration: mirroring
(d) Workload: a series of random 1-block reads Configuration: distributed parity
(e) Workload: a series of random 1-block reads Configuration: distributed parity with groupsize G and one failed disk
(f) Workload: a long sequential write Configuration: mirroring
(g) Workload: a long sequential write Configuration: distributed parity with a group size of G