NDLI: An Incremental File System Consistency Checker for Block-Level CDP Systems

Content Provider	IEEE Xplore Digital Library
Author	Maohua Lu Tzi-cker Chiueh Shibiao Lin
Copyright Year	2008
Description	Author affiliation: Google Inc., CA (Shibiao Lin) \|\| Dept. of Comput. Sci., Stony Brook Univ., Stony Brook, NY (Maohua Lu; Tzi-cker Chiueh)
Abstract	A block-level continuous data protection (CDP) system logs every disk block update from an application server (e.g., a file or DBMS server) to a storage system so that any disk updates within a time window are undoable, and thus is able to provide a more flexible and efficient data protection service than conventional periodic data backup systems. Unfortunately, no existing block-level CDP systems can support arbitrary point-in-time snapshots that are guaranteed to be consistent with respect to the metadata of the application server. This deficiency seriously limits the flexibility in recovery point objective (RTO) of block-level CDP systems from the standpoint of the application servers whose data they protect. This paper describes an incremental file system check mechanism (iFSCK) that is designed to address this deficiency for file servers, and exploits file system-specific knowledge to quickly fix an arbitrary point-in-time block-level snapshot so that it is consistent with respect to file system metadata. Performance measurements taken from a fully operational iFSCK prototype show that iFSCK can turn a 10 GB point-in-time block-level snapshot to be file-system consistent in less than 1 second, and takes less than 25% of the time required by the Fsck utility for vanilla ext3 under relaxed metadata consistency requirements.
Starting Page	157
Ending Page	162
File Size	258472
Page Count	6
File Format	PDF
ISBN	9780769534107
ISSN	10609857
DOI	10.1109/SRDS.2008.20
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-10-06
Publisher Place	Italy
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	File systems File servers Protection Network servers Image storage Access protocols Computer network reliability Computer science Application software Measurement CDP FSCK
Content Type	Text
Resource Type	Article
Subject	Theoretical Computer Science Computer Networks and Communications Software Hardware and Architecture

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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
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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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