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Paper Abstract and Keywords
Presentation 2015-08-05 16:15
Fragmentation-aware Write Optimization for Flash SSDs
Shugo Ogawa, Takuya Araki (NEC) CPSY2015-32
Abstract (in Japanese) (See Japanese page) 
(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) 
(in English) SSD / NAND Flash / fragmentation / Garbage Collection / stream / rewrite / /  
Reference Info. IEICE Tech. Rep., vol. 115, no. 174, CPSY2015-32, pp. 173-178, Aug. 2015.
Paper # CPSY2015-32 
Date of Issue 2015-07-28 (CPSY) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF CPSY2015-32

Conference Information
Committee CPSY DC IPSJ-ARC  
Conference Date 2015-08-04 - 2015-08-06 
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 
Paper Information
Registration To CPSY 
Conference Code 2015-08-CPSY-DC 
Language Japanese 
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  
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Keyword(8)  
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)
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Speaker Author-1 
Date Time 2015-08-05 16:15:00 
Presentation Time 30 minutes 
Registration for CPSY 
Paper # CPSY2015-32 
Volume (vol) vol.115 
Number (no) no.174 
Page pp.173-178 
#Pages 6 
Date of Issue 2015-07-28 (CPSY) 

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