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Summary: Improving Storage System Availability with D-GRAID
Muthian Sivathanu, Vijayan Prabhakaran,
Andrea C. Arpaci-Dusseau, and Remzi H. Arpaci-Dusseau
Computer Sciences Department
University of Wisconsin, Madison
{muthian, vijayan, dusseau, remzi}@cs.wisc.edu
Abstract
We present the design, implementation, and evaluation of
D-GRAID, a gracefully-degradingand quickly-recovering
RAID storage array. D-GRAID ensures that most files
within the file system remain available even when an un-
expectedly high number of faults occur. D-GRAID also
recovers from failures quickly, restoring only live file sys-
tem data to a hot spare. Both graceful degradation and
live-block recovery are implemented in a prototype SCSI-
based storage system underneath unmodified file systems,
demonstrating that powerful "file-system like" function-
ality can be implemented behind a narrow block-based
interface.
1 Introduction
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