NDLI: DARC: design and evaluation of an I/O controller for data protection

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DARC: design and evaluation of an I/O controller for data protection

Content Provider	ACM Digital Library
Author	Bilas, Angelos Flouris, Michail D. Marazakis, Manolis Fountoulakis, Markos
Abstract	Lately, with increasing disk capacities, there is increased concern about protection from data errors, beyond masking of device failures. In this paper, we present a prototype I/O stack for storage controllers that encompasses two data protection features: (a) persistent checksums to protect data at-rest from silent errors and (b) block-level versioning to allow protection from user errors. Although these techniques have been previously used either at the device level (checksums) or at the host (versioning), in this work we implement these features in the storage controller, which allows us to use any type of storage devices as well as any type of host I/O stack. The main challenge in our approach is to deal with persistent metadata in the controller I/O path. Our main contribution is to show the implications of introducing metadata at this level and to deal with the performance issues that arise. Overall, we find that data protection features can be incorporated in the I/O path with a performance penalty in the range of 12% to 25%, offering much stronger data protection guarantees than today's commodity storage servers.
Starting Page	1
Ending Page	12
Page Count	12
File Format	PDF
ISBN	9781605589084
DOI	10.1145/1815695.1815721
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2010-05-24
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Versioning Storage architecture Storage controllers Data protection Block-level i/o I/o performance Error detection Virtualization
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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