| Paper Abstract and Keywords |
| Presentation |
2005-12-16 12:30
Disk Access Pattern Analysis for Self-defragmentation Method of File Servers based on IP Storage
Yoshiko Yasuda, Shinichi Kawamoto (Hitachi Ltd.) |
| Abstract |
(in Japanese) |
(See Japanese page) |
| (in English) |
In a large file server, disk fragmentation curbs file access performance. To improve the performance, a self-defragmentation method, which dissolves the disk fragmentation without changing the existing filesystem, designed for file servers based on IP storage has been developed. To validate the self-defragmentation method, disk access patterns when the disk fragmentation occurs were analyzed by using an file server based on IP storage. The results show that the rate of sequential disk access is an only 5% of total disk accesses because of fine granularity of access unit and mixture of user data and filesystem data accesses. To solve this problem, a multi-step defragmentation method, which groups SCSI commands into access type and then reallocates the data, has been proposed. The performance estimation shows that the sequential disk accesses attains 17% of total accesses by using the proposed method. |
| Keyword |
(in Japanese) |
(See Japanese page) |
| (in English) |
IP storage / file servers / self-defragmentation / disk access pattern analysis / / / / |
| Reference Info. |
IEICE Tech. Rep., vol. 105, no. 487, CPSY2005-33, pp. 1-6, Dec. 2005. |
| Paper # |
CPSY2005-33 |
| Date of Issue |
2005-12-09 (CPSY) |
| ISSN |
Print edition: ISSN 0913-5685 |
| Download PDF |
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| Conference Information |
| Committee |
CPSY |
| Conference Date |
2005-12-16 - 2005-12-16 |
| Place (in Japanese) |
(See Japanese page) |
| Place (in English) |
Academia Hall, Utsunomiya Univ. |
| Topics (in Japanese) |
(See Japanese page) |
| Topics (in English) |
Autonomous and cooperative systems, etc. |
| Paper Information |
| Registration To |
CPSY |
| Conference Code |
2005-12-CPSY |
| Language |
Japanese |
| Title (in Japanese) |
(See Japanese page) |
| Sub Title (in Japanese) |
(See Japanese page) |
| Title (in English) |
Disk Access Pattern Analysis for Self-defragmentation Method of File Servers based on IP Storage |
| Sub Title (in English) |
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| Keyword(1) |
IP storage |
| Keyword(2) |
file servers |
| Keyword(3) |
self-defragmentation |
| Keyword(4) |
disk access pattern analysis |
| Keyword(5) |
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| Keyword(6) |
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| 1st Author's Name |
Yoshiko Yasuda |
| 1st Author's Affiliation |
Central Research Laboratory, Hitachi Ltd. (Hitachi Ltd.) |
| 2nd Author's Name |
Shinichi Kawamoto |
| 2nd Author's Affiliation |
Central Research Laboratory, Hitachi Ltd. (Hitachi Ltd.) |
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| Speaker |
Author-1 |
| Date Time |
2005-12-16 12:30:00 |
| Presentation Time |
25 minutes |
| Registration for |
CPSY |
| Paper # |
CPSY2005-33 |
| Volume (vol) |
vol.105 |
| Number (no) |
no.487 |
| Page |
pp.1-6 |
| #Pages |
6 |
| Date of Issue |
2005-12-09 (CPSY) |
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