NDLI: Comparison of sparing alternatives for disk arrays

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Comparison of sparing alternatives for disk arrays

Content Provider	ACM Digital Library
Author	Menon, Jai Mattson, Dick
Abstract	This paper explores how choice of sparing methods impacts the performance of RAID level 5 (or parity striped) disk arrays. The three sparing methods examined are dedicated sparing, distributed sparing, and parity sparing. For database type workloads with random single block reads and writes, array performance is compared in four different modes - normal mode (no disks have failed), degraded mode (a disk has failed and its data has not been reconstructed), rebuild mode (a disk has failed and its data is being reconstructed), and copyback mode(which is needed for distributed sparing and parity sparing when failed disks are replaced with new disks). Attention is concentrated on small disk subsystems (fewer than 32 disks) where choice of sparing method has significant impact on array performance, rather than large disk subsystems (64 or more disks). It is concluded that, for disk subsystems with a small number of disks, distributed sparing offers major advantages over dedicated sparing in normal, degraded and rebuild modes of operation, even if one has to pay a copyback penalty. Furthermore, it is better than parity sparing in rebuild mode and similar to it in other operating modes, making it the sparing method of choice.
Starting Page	318
Ending Page	329
Page Count	12
File Format	PDF
ISBN	0897915097
DOI	10.1145/139669.140392
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1992-05-19
Publisher Place	New York
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article

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