Reliability Modeling of Declustered-Parity RAID Considering Uncorrectable Bit Errors

Xuefeng WU; Jie LI; Hisao KAMEDA

Reliability Modeling of Declustered-Parity RAID Considering Uncorrectable Bit Errors

Xuefeng WU, Jie LI, Hisao KAMEDA

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UNcorrectable Bit Errors (UNBEs) are important in considering the reliability of Redundant Array of Inexpensive Disks (RAID). They, however, have been ignored or have not been studied in detail in existing reliability analysis of RAID. In this paper, we present an analytic model to study the reliability of declustered-parity RAID by considering UNBEs. By using the analytic model, the optimistic and the pessimistic estimates of the probability that data loss occurs due to an UNBE during the data reconstruction after a disk failed (we call this DB data loss) are obtained. Then, the optimistic and the pessimistic estimates of the Mean Time To Data Loss (MTTDL) that take into account both DB data loss and the data loss caused by double independent disk failures (we call this DD data loss) are obtained. Furthermore, how the MTTDL depends on the number of units in a parity stripe, rebuild time of a failed disk and write fraction of data access are studied by numerical analysis.

Publication: IEICE TRANSACTIONS on Fundamentals Vol.E80-A No.8 pp.1508-1515

Publication Date: 1997/08/25

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Category: Reliability and Fault Analysis

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Xuefeng WU, Jie LI, Hisao KAMEDA, "Reliability Modeling of Declustered-Parity RAID Considering Uncorrectable Bit Errors" in IEICE TRANSACTIONS on Fundamentals, vol. E80-A, no. 8, pp. 1508-1515, August 1997, doi: .
Abstract: UNcorrectable Bit Errors (UNBEs) are important in considering the reliability of Redundant Array of Inexpensive Disks (RAID). They, however, have been ignored or have not been studied in detail in existing reliability analysis of RAID. In this paper, we present an analytic model to study the reliability of declustered-parity RAID by considering UNBEs. By using the analytic model, the optimistic and the pessimistic estimates of the probability that data loss occurs due to an UNBE during the data reconstruction after a disk failed (we call this DB data loss) are obtained. Then, the optimistic and the pessimistic estimates of the Mean Time To Data Loss (MTTDL) that take into account both DB data loss and the data loss caused by double independent disk failures (we call this DD data loss) are obtained. Furthermore, how the MTTDL depends on the number of units in a parity stripe, rebuild time of a failed disk and write fraction of data access are studied by numerical analysis.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/e80-a_8_1508/_p

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@ARTICLE{e80-a_8_1508,
author={Xuefeng WU, Jie LI, Hisao KAMEDA, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Reliability Modeling of Declustered-Parity RAID Considering Uncorrectable Bit Errors},
year={1997},
volume={E80-A},
number={8},
pages={1508-1515},
abstract={UNcorrectable Bit Errors (UNBEs) are important in considering the reliability of Redundant Array of Inexpensive Disks (RAID). They, however, have been ignored or have not been studied in detail in existing reliability analysis of RAID. In this paper, we present an analytic model to study the reliability of declustered-parity RAID by considering UNBEs. By using the analytic model, the optimistic and the pessimistic estimates of the probability that data loss occurs due to an UNBE during the data reconstruction after a disk failed (we call this DB data loss) are obtained. Then, the optimistic and the pessimistic estimates of the Mean Time To Data Loss (MTTDL) that take into account both DB data loss and the data loss caused by double independent disk failures (we call this DD data loss) are obtained. Furthermore, how the MTTDL depends on the number of units in a parity stripe, rebuild time of a failed disk and write fraction of data access are studied by numerical analysis.},
keywords={},
doi={},
ISSN={},
month={August},}

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TY - JOUR
TI - Reliability Modeling of Declustered-Parity RAID Considering Uncorrectable Bit Errors
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 1508
EP - 1515
AU - Xuefeng WU
AU - Jie LI
AU - Hisao KAMEDA
PY - 1997
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E80-A
IS - 8
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - August 1997
AB - UNcorrectable Bit Errors (UNBEs) are important in considering the reliability of Redundant Array of Inexpensive Disks (RAID). They, however, have been ignored or have not been studied in detail in existing reliability analysis of RAID. In this paper, we present an analytic model to study the reliability of declustered-parity RAID by considering UNBEs. By using the analytic model, the optimistic and the pessimistic estimates of the probability that data loss occurs due to an UNBE during the data reconstruction after a disk failed (we call this DB data loss) are obtained. Then, the optimistic and the pessimistic estimates of the Mean Time To Data Loss (MTTDL) that take into account both DB data loss and the data loss caused by double independent disk failures (we call this DD data loss) are obtained. Furthermore, how the MTTDL depends on the number of units in a parity stripe, rebuild time of a failed disk and write fraction of data access are studied by numerical analysis.
ER -