| Presentation | 2015-12-11 Evaluation for Restoration Time of Erasure Coded Data after Large-scale Disaster Hitoshi Kamei, Shinya Matsumoto, Takaki Nakamura, Hiroaki Muraoka, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | We evaluate the restoration time of erasure coded data after large-scale disaster. The Disaster Recovery (DR) is used to continue the services provided by main site when the site stops after the disaster, e.g. earthquake. The DR is a function that backs data up to a remote site periodically and enables the backup service on the remote site after the disaster. When the main site is recovered, the DR enables the service on the main site by fail-back process. If the data in the main site is broken, the data is restored from the remote site. To reduce the restoration time, the Erasure Code (EC) can be used for the backup restore method. The EC creates some data fragments and one or more parity fragment(s) to achieve high availability as well as high restoration performance because of obtaining these fragments in parallel. In contrast, the number of sites storing these fragments is limited, and the number of data fragments and parity fragments affects the restoration performance. Especially, the number of running sites is varied in accordance with elapsed time after the large-scale disaster, so the estimations are needed to confirm the effectivity. In this paper, we run the simulation, and then, we discuss the most efficient number of these fragments. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Disaster Recovery / Erasure Coding / Restoration Time |
| Paper # | MR2015-28 |
| Date of Issue | 2015-12-03 (MR) |
| Conference Information | |
| Committee | MR / ITE-MMS |
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| Conference Date | 2015/12/10(2days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | Ehime Univ. |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Signal Processing, etc. |
| Chair | Masukazu Igarashi(*) / Eiichi Miyashita(NHK) |
| Vice Chair | |
| Secretary | (Syowa Denko) / (Toshiba) |
| Assistant | Fumiko Akagi(Kogakuin Univ.) / Takayuki Shima(AIST) |
| Paper Information | |
| Registration To | Technical Committee on Magnetic Recording / Technical Group on Multi-media Storage |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Evaluation for Restoration Time of Erasure Coded Data after Large-scale Disaster |
| Sub Title (in English) | |
| Keyword(1) | Disaster Recovery |
| Keyword(2) | Erasure Coding |
| Keyword(3) | Restoration Time |
| 1st Author's Name | Hitoshi Kamei |
| 1st Author's Affiliation | Hitachi, Ltd(Hitachi) |
| 2nd Author's Name | Shinya Matsumoto |
| 2nd Author's Affiliation | Hitachi, Ltd(Hitachi) |
| 3rd Author's Name | Takaki Nakamura |
| 3rd Author's Affiliation | Tohoku University(Tohoku Univ.) |
| 4th Author's Name | Hiroaki Muraoka |
| 4th Author's Affiliation | Tohoku University(Tohoku Univ.) |
| Date | 2015-12-11 |
| Paper # | MR2015-28 |
| Volume (vol) | vol.115 |
| Number (no) | MR-356 |
| Page | pp.pp.37-42(MR), |
| #Pages | 6 |
| Date of Issue | 2015-12-03 (MR) |