Reliability Analysis of Disk Array Organizations by Considering Uncorrectable Bit Errors

Authors:
Xuefeng Wu;Jie Li;Hisao Kameda
Affiliations:
-;-;-
Venue:
SRDS '97 Proceedings of the 16th Symposium on Reliable Distributed Systems
Year:
1997

Citing 0
Cited 2

Declustered disk array architectures with optimal and near-optimal parallelism

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A new intra-disk redundancy scheme for high-reliability RAID storage systems in the presence of unrecoverable errors

ACM Transactions on Storage (TOS)

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Abstract

In this paper, we present an analytic model to study the reliability of some important disk array organizations that have been proposed by others in the literature. These organizations are based on the combination of two options for the data layout, regular RAID-5 and block designs, and three alternatives for sparing, hot sparing, distributed sparing and parity sparing. Uncorrectable bit errors have big effects on reliability but are ignored in traditional reliability analysis of disk arrays. We consider both disk failures and uncorrectable bit errors in the model. The reliability of disk arrays is measured in terms of MTTDL (Mean Time To Data Loss). A unified formula of MTTDL has been derived for these disk array organizations. The MTTDLs of these disk array organizations are also compared using the analytic model.