Title :
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
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;
Conference_Titel :
Reliable Distributed Systems, 1997. Proceedings., The Sixteenth Symposium on
Conference_Location :
Durham, NC
Print_ISBN :
0-8186-8177-2
DOI :
10.1109/RELDIS.1997.632790
