Reliability analysis of disk array organizations by considering uncorrectable bit errors

Author

Wu, Xuefeng ; Li, Jie ; Kameda, Hisao

Author_Institution

Inst. of Inf. Sci. & Electron., Tsukuba Univ., Ibaraki, Japan

fYear

1997

Firstpage

2

Lastpage

9

Abstract

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

Keywords

errors; fault tolerant computing; magnetic disc storage; reliability theory; storage management; MTTDL; Mean Time To Data Loss; analytic model; block designs; data layout; disk array organizations; disk failures; distributed sparing; hot sparing; parity sparing; regular RAID-5; reliability analysis; uncorrectable bit errors; Cities and towns; Computer crashes; Degradation; Error correction; Error correction codes; Information analysis; Loss measurement; System performance; Time measurement;

fLanguage

English

Publisher

ieee

Conference_Titel

Reliable Distributed Systems, 1997. Proceedings., The Sixteenth Symposium on

Conference_Location

Durham, NC

ISSN

1060-9857

Print_ISBN

0-8186-8177-2

Type

conf

DOI

10.1109/RELDIS.1997.632790

Filename

632790