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Paper Abstract and Keywords
Presentation 2015-12-11 09:00
Evaluation for Restoration Time of Erasure Coded Data after Large-scale Disaster
Hitoshi Kamei, Shinya Matsumoto (Hitachi), Takaki Nakamura, Hiroaki Muraoka (Tohoku Univ.) MR2015-28
Abstract (in Japanese) (See Japanese page) 
(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) 
(in English) Disaster Recovery / Erasure Coding / Restoration Time / / / / /  
Reference Info. IEICE Tech. Rep., vol. 115, Dec. 2015.
Paper #  
Date of Issue 2015-12-03 (MR) 
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 MR2015-28

Conference Information
Committee MRIS ITE-MMS  
Conference Date 2015-12-10 - 2015-12-11 
Place (in Japanese) (See Japanese page) 
Place (in English) Ehime Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Signal Processing, etc. 
Paper Information
Registration To MRIS 
Conference Code 2015-12-MR-MMS 
Language Japanese 
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  
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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.)
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Speaker Author-1 
Date Time 2015-12-11 09:00:00 
Presentation Time 25 minutes 
Registration for MRIS 
Paper # MR2015-28 
Volume (vol) vol.115 
Number (no) no.356 
Page pp.37-42 
#Pages 6 
Date of Issue 2015-12-03 (MR) 

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