Automatic Recovery from Disk Failure in Continuous-Media Servers
IEEE Transactions on Parallel and Distributed Systems
RAID5 Performance with Distributed Sparing
IEEE Transactions on Parallel and Distributed Systems
Higher reliability redundant disk arrays: Organization, operation, and coding
ACM Transactions on Storage (TOS)
Why specialized disks for composite operations may be unnecessary
ACM SIGARCH Computer Architecture News
Survey and analysis of disk scheduling methods
ACM SIGARCH Computer Architecture News
Rebuild processing in RAID5 with emphasis on the supplementary parity augmentation method[37]
ACM SIGARCH Computer Architecture News
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The response time of disk accesses in RAID5 disk arrays degrades when one of the N+1 disks fails and there is a further degradation by the interference caused by rebuild processing. In addition to giving user accesses a higher non-preemptive priority over track reads for rebuild, we consider: (i) the read redirection option; (ii) split-seek option, i.e., allowing user requests to preempt track reads after a seek is completed; (iii) the split-latency/transfer option, i.e., allowing user requests to preempt track reads, Simulation results show that for lower disk utilizations the split-latency/transfer option is desirable in that it reduces response time, while not increasing rebuild time considerably. At higher disk utilizations the response time attained by the split-latency transfer option is comparable to that attained by less preemptive options with shorter rebuild times. A new metric, excess cumulative response time, is defined to compare the efficiency of rebuild options.