NDLI: TH-CDP: An Efficient Block Level Continuous Data Protection System

Content Provider	IEEE Xplore Digital Library
Author	Yonghong Sheng Dongsheng Wang Jin-Yang He Da-Peng Ju
Copyright Year	2009
Abstract	Traditional data protection technologies, such as remote mirroring, snapshot and backup, cannot completely solve virus attack, user error problems. Continuous data protection (CDP), capturing all data writes at file or block level, is an enabling technology to storage systems against malicious attacks or user mistakes, because it allows each block data to be undoable. Most of existing data protection systems or prototypes are not real CDP ones because there is a data exposure between subsequent snapshots. Therefore they provide less granular recovery points. In addition, some products work either at file system level or at application level which lack general purpose. This paper presents the design, implementation, and performance of a new block level continuous data protection system, TH-CDP. Besides providing the basic functions of true CDP, TH-CDP provides virtual volume image at any point in time without affecting the production system. Another distinctive feature of TH-CDP is its checkpointing mechanism. By encapsulating the checkpoint information into I/O request packet queue, TH-CDP can take checkpoints without temporarily halting normal business processing or any incoming request. In addition, TH-CDP uses log-structured technique to store changed block data on raw disk, thereby speeding up both data writing and space recycling. Extensive experiments on file systems, databases using IOzone, and TPC-C benchmark show that TH-CDP can effectively improve the convenience of checkpointing and recovery assurance process. Under the circumstances of the changed block data up to 20 times of the original data size, the 100% sequence read speed of the oldest virtual volume image version is nearly 1/3 to 1/4 compared to the normal iSCSI volume.
Starting Page	395
Ending Page	404
File Size	707490
Page Count	10
File Format	PDF
ISBN	9780769537412
DOI	10.1109/NAS.2009.69
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-07-09
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Checkpointing Production systems Laboratories Block level data protection Image restoration Helium Continuous Data Protection CDP Information science Checkpoint File systems Prototypes Computer errors Protection
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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