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Improving Storage System Availability with D-GRAID

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Author(s)
Sivathanu, Muthian; Prabhakaran, Vajayan; Arpaci-Dusseau, Andrea; Arpaci-Dusseau, Remzi
Publisher
University of Wisconsin-Madison Department of Computer Sciences
Citation
TR1473
Date
2003
Abstract
We present the design, implementation, and evaluation of D-GRAID, a gracefully-degrading and quickly-recovering RAID storage array. D-GRAID ensures that most files within the file system remain available even when an unexpectdly high number of faults occur: D-GRAID also recovers from failures quickly, restoring only live file system data to a hot spare. Both graceful degradation and live-block recovery are implemented in a prototype SCSI-based storage system, demonstrating that powerful "file-system like" functionality can be implemented behind a narrow block-based interface.
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http://digital.library.wisc.edu/1793/60344 
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