Adaptec 133U2 User Guide - Page 167
Acronym for Redundant Array of Independent/Inexpensive
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Glossary physical view A view showing physical devices such as SCSI disks, CDROMs, and enclosures. poll A validation of discovery information. pool of spares See spare pool. R RAID Acronym for Redundant Array of Independent/Inexpensive Disks. Coined in 1987 by researchers at the University of California at Berkeley to describe a set of disk array architectures that provide fault-tolerance and improved performance. RAID-0 An array where data is distributed, or striped, across the disks in the array. RAID-1 (mirrored) An array which uses a single pair of disks. Both disks in the pair contain the same data. RAID 0/1 (mirrored) Array which use from two to eight pairs of disks. Both disks in each pair contain the same data. RAID-5 Arrays which contain redundant information in the form of parity data. The parity data is distributed across all the disks in the array and occupies the equivalent capacity of about one disk. User data is interspersed with this parity data. reconstruction The regeneration and writing onto one or more replacement disks of all of the data from a failed disk in redundant RAID array. Reconstruction is usually performed in the background, while applications are accessing data in the array. redundancy Maintaining duplicates for any given component in a system, so that the system can automatically replace a failed component with a working substitute. A parity RAID array's Glossary-7
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