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Paper Abstract and Keywords
Presentation 2016-12-16 14:15
Note on RAID Reliability Improvements Based on Preventive Safety and Desynchronization of Operation Start Time
Masayuki Arai, Satoshi Furukawa, Tomoya Watanabe (Nihon Univ.) DC2016-67
Abstract (in Japanese) (See Japanese page) 
(in English) RAID (Redundant Arrays of Inexpensive (Independent) Disks) is well known and commonly used to improve reliability of data kept in HDDs. Ageing of HDDs is considered as one of major factors which degrades reliability of entire RAID system. Recently survey based on analysis of time-to-failures of many HDDs has reported that HDD failures seldom occur within first 1 year, and then failure rates gradually increase. Taking this tendency of failures into account, in this paper we discuss reliability improvement strategies of RAID systems. We first propose preventive-safety-RAID based on replacements of non-faulty HDDs, evaluating its system reliability, mean-time-to-data-loss (MTTDL), and cost-performance. Aiming to cost reduction, we then evaluate effectiveness of a RAID system based on desynchronization of operation start time of each HDD. We use simulations for two different desynchronization patterns, showing that MTTDL can be improved in comparison to the case where all HDDs are used in the same time.
Keyword (in Japanese) (See Japanese page) 
(in English) RAID / preventive safety / desynchronization / replancement of non-fauty HDDs / asymmetrization / / /  
Reference Info. IEICE Tech. Rep., vol. 116, no. 373, DC2016-67, pp. 17-21, Dec. 2016.
Paper # DC2016-67 
Date of Issue 2016-12-09 (DC) 
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)
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Conference Information
Committee DC  
Conference Date 2016-12-16 - 2016-12-16 
Place (in Japanese) (See Japanese page) 
Place (in English) Sakata Sogo-Bunka Center(Sakata-City) 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Winter Workshop on safety 
Paper Information
Registration To DC 
Conference Code 2016-12-DC 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Note on RAID Reliability Improvements Based on Preventive Safety and Desynchronization of Operation Start Time 
Sub Title (in English)  
Keyword(1) RAID  
Keyword(2) preventive safety  
Keyword(3) desynchronization  
Keyword(4) replancement of non-fauty HDDs  
Keyword(5) asymmetrization  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Masayuki Arai  
1st Author's Affiliation Nihon University (Nihon Univ.)
2nd Author's Name Satoshi Furukawa  
2nd Author's Affiliation Nihon University (Nihon Univ.)
3rd Author's Name Tomoya Watanabe  
3rd Author's Affiliation Nihon University (Nihon Univ.)
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Speaker Author-1 
Date Time 2016-12-16 14:15:00 
Presentation Time 25 minutes 
Registration for DC 
Paper # DC2016-67 
Volume (vol) vol.116 
Number (no) no.373 
Page pp.17-21 
#Pages 5 
Date of Issue 2016-12-09 (DC) 

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