Title :
Improving Disk Array Reliability Through Expedited Scrubbing
Author :
Jehan-François Pâris;Thomas Schwarz;Ahmed Amer;Darrell D.E. Long
Author_Institution :
Comput. Sci. Dept., Univ. of Houston, Houston, TX, USA
Abstract :
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 built-in 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 twenty-four hour interval.
Keywords :
"Arrays","Maintenance engineering","Redundancy","Organizations","Media","Computer science"
Conference_Titel :
Networking, Architecture and Storage (NAS), 2010 IEEE Fifth International Conference on
Print_ISBN :
978-1-4244-8133-0
DOI :
10.1109/NAS.2010.37