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Identifier

000358707

Title

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

Alternative Title

Σχεδίαση και αξιολόγηση ενός ελεγκτή εισόδου εξόδου για προστασία δεδομένων

Author

Φουντουλάκης, Μάρκος

Thesis advisor

Μπίλας, Άγγελος

Abstract

Lately, with increasing disk capacities, there is increased concern about protection from data errors, beyond masking of device failures. In this thesis, we present a prototype I/O stack for storage cotrollers that encompasses two data protection features: (a) persistent cheksums 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 (cheksums) or at the host (versioning), in this work me 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 imlications 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.

Language

English

Subject

Block-level I/O

Data protection

Error detection

I/O performance

Storage architecture

Storage controllers

Versioning

Virtualization

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