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Linux Journal: High Availability Linux with Software RAID

May 07, 2003, 14:30 (11 Talkback[s])
(Other stories by Micah Silverman)

"Disk mirroring uses two drives at a time and duplicates exactly one drive to the other. This duplication provides hardware redundancy; if one drive fails, the other can continue to operate independently. Software errors can propagate across the mirror, however, corrupting both disks...

"Level 5 stripes data and the error correcting parity data across all the disks in the array. As a result, one disk can fail without loss of data. When this happens, the RAID is said to be operating in degraded mode. If more than one disk fails at the same time, though, the entire array will fail.

"This article focuses on using software RAID Level 5 under a fresh installation of Red Hat 8.0 and testing the fault tolerance of the RAID. RAID support for Linux has matured over the years, and the ability to install a system that can boot into a RAID-configured set of disks is standard..."

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