| Presentation | 2015-08-05 Fragmentation-aware Write Optimization for Flash SSDs Shugo Ogawa, Takuya Araki, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Flash SSDs are becoming available to the purpose of storing stream data from many devices with an increase in capacity and a decrease in price. These streams are frequently fragmented by other ones in SSDs. However, it is difficult to mitigate these fragmentations by employing prior hot/cold data separation schemes that depend on access locality. In this paper, we propose Cold Data Defragmentation scheme that focuses on fragmentations caused by cold data. This scheme dissolves fragmentations of cold data by rewriting them for the purpose of avoiding relocation of fragmented data in SSDs. Evaluation result shows that our scheme reduces write data to NAND Flash in SSDs up to 58 % by rewriting fragmented cold data. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | SSD / NAND Flash / fragmentation / Garbage Collection / stream / rewrite |
| Paper # | CPSY2015-32 |
| Date of Issue | 2015-07-28 (CPSY) |
| Conference Information | |
| Committee | CPSY / DC / IPSJ-ARC |
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| Conference Date | 2015/8/4(3days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | B-Con Plaza (Beppu) |
| Topics (in Japanese) | (See Japanese page) |
| Topics (in English) | Parallel, Distributed and Cooperative Processing |
| Chair | Yasuhiko Nakashima(NAIST) / Nobuyasu Kanekawa(Hitachi) |
| Vice Chair | Koji Nakano(Hiroshima Univ.) / Hidetsugu Irie(Univ. of Tokyo) / Michiko Inoue(NAIST) |
| Secretary | Koji Nakano(Fujitsu Labs.) / Hidetsugu Irie(NII) / Michiko Inoue(RTRI) / (Kyoto Sangyo Univ.) |
| Assistant | Shinya Takameda(NAIST) / Takeshi Ohkawa(Utsunomiya Univ.) |
| Paper Information | |
| Registration To | Technical Committee on Computer Systems / Technical Committee on Dependable Computing / Special Interest Group on System Architecture |
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| Language | JPN |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Fragmentation-aware Write Optimization for Flash SSDs |
| Sub Title (in English) | |
| Keyword(1) | SSD |
| Keyword(2) | NAND Flash |
| Keyword(3) | fragmentation |
| Keyword(4) | Garbage Collection |
| Keyword(5) | stream |
| Keyword(6) | rewrite |
| 1st Author's Name | Shugo Ogawa |
| 1st Author's Affiliation | NEC Corporation(NEC) |
| 2nd Author's Name | Takuya Araki |
| 2nd Author's Affiliation | NEC Corporation(NEC) |
| Date | 2015-08-05 |
| Paper # | CPSY2015-32 |
| Volume (vol) | vol.115 |
| Number (no) | CPSY-174 |
| Page | pp.pp.173-178(CPSY), |
| #Pages | 6 |
| Date of Issue | 2015-07-28 (CPSY) |