The ADvanced Systems Laboratory (ADSL)
Publication abstract
| :: | Home |
| :: | Projects |
| :: | People |
| :: | Pictures |
| :: | Publications |
| :: | Software |
| :: | Sponsors |
| :: | Internal |
Improving Storage System Availability with D-GRAID
Muthian Sivathanu,
Vijayan Prabhakaran,
Andrea C. Arpaci-Dusseau,
Remzi H. Arpaci-Dusseau
Department of Computer Sciences,
University of Wisconsin-Madison
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 unexpectedly high number of faults occur. D-GRAID achieves high availability through aggressive replication of semantically critical data, and fault-isolated placement of logically related data. D-GRAID also recovers from failures quickly, restoring only live file system data to a hot spare. Both graceful degradation and fault-isolated placement are implemented in a prototype SCSI-based storage system underneath unmodified file systems, demonstrating that powerful ``file-system like'' functionality can be implemented within a ``semantically-smart'' disk system behind a narrow block-based interface.
Available as:
PDF,
BibTeX
Publications