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NAS
2010
IEEE

Improving Disk Array Reliability Through Expedited Scrubbing

13 years 1 months ago
Improving Disk Array Reliability Through Expedited Scrubbing
—Disk scrubbing periodically scans the contents of a disk array to detect the presence of irrecoverable read errors and reconstitute the contents of the lost blocks using the builtin redundancy of the disk array. We address the issue of scheduling scrubbing runs in disk arrays that can tolerate two disk failures without incurring a data loss, and propose to start an urgent scrubbing run of the whole array whenever a disk failure is detected. Used alone or in combination with periodic scrubbing runs, these expedited runs can improve the mean time to data loss of disk arrays over a wide range of disk repair times. As a result, our technique eliminates the need for frequent scrubbing runs and the need to maintain spare disks and personnel on site to replace failed disks within a twentyfour hour interval. Keywords-irrecoverable read errors; RAID arrays; disk scrubbing.
Jehan-François Pâris, Thomas J. E. Sc
Added 29 Jan 2011
Updated 29 Jan 2011
Type Journal
Year 2010
Where NAS
Authors Jehan-François Pâris, Thomas J. E. Schwarz, Ahmed Amer, Darrell D. E. Long
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