| Presentation | 2016-12-16 Note on RAID Reliability Improvements Based on Preventive Safety and Desynchronization of Operation Start Time Masayuki Arai, Satoshi Furukawa, Tomoya Watanabe, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | RAID (Redundant Arrays of Inexpensive (Independent) Disks) is well known and commonly used to improve reliability of data kept in HDDs. Ageing of HDDs is considered as one of major factors which degrades reliability of entire RAID system. Recently survey based on analysis of time-to-failures of many HDDs has reported that HDD failures seldom occur within first 1 year, and then failure rates gradually increase. Taking this tendency of failures into account, in this paper we discuss reliability improvement strategies of RAID systems. We first propose preventive-safety-RAID based on replacements of non-faulty HDDs, evaluating its system reliability, mean-time-to-data-loss (MTTDL), and cost-performance. Aiming to cost reduction, we then evaluate effectiveness of a RAID system based on desynchronization of operation start time of each HDD. We use simulations for two different desynchronization patterns, showing that MTTDL can be improved in comparison to the case where all HDDs are used in the same time. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | RAID / preventive safety / desynchronization / replancement of non-fauty HDDs / asymmetrization |
| Paper # | DC2016-67 |
| Date of Issue | 2016-12-09 (DC) |
| Conference Information | |
| Committee | DC |
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| Conference Date | 2016/12/16(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Sakata Sogo-Bunka Center(Sakata-City) |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Winter Workshop on safety |
| Chair | Michiko Inoue(NAIST) |
| Vice Chair | Satoshi Fukumoto(Tokyo Metropolitan Univ.) |
| Secretary | Satoshi Fukumoto(Kyoto Sangyo Univ.) |
| Assistant | |
| Paper Information | |
| Registration To | Technical Committee on Dependable Computing |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Note on RAID Reliability Improvements Based on Preventive Safety and Desynchronization of Operation Start Time |
| Sub Title (in English) | |
| Keyword(1) | RAID |
| Keyword(2) | preventive safety |
| Keyword(3) | desynchronization |
| Keyword(4) | replancement of non-fauty HDDs |
| Keyword(5) | asymmetrization |
| 1st Author's Name | Masayuki Arai |
| 1st Author's Affiliation | Nihon University(Nihon Univ.) |
| 2nd Author's Name | Satoshi Furukawa |
| 2nd Author's Affiliation | Nihon University(Nihon Univ.) |
| 3rd Author's Name | Tomoya Watanabe |
| 3rd Author's Affiliation | Nihon University(Nihon Univ.) |
| Date | 2016-12-16 |
| Paper # | DC2016-67 |
| Volume (vol) | vol.116 |
| Number (no) | DC-373 |
| Page | pp.pp.17-21(DC), |
| #Pages | 5 |
| Date of Issue | 2016-12-09 (DC) |