Adaptec 29320A-R User Guide - Page 198

Glossary physical resources The Adaptec Family Adapter products, channels, and SCSI devices installed in the server. poll A validation of discovery information. 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 (striping) An array where data is distributed, or striped, across the disks in the array. RAID 1 (mirrored) An array that uses a single pair of disks. Both disks in the pair contain the same data. RAID 10 (mirrored striping) An array that uses from two to eight pairs of disks. Both disks in each pair contain the same data. rebuild The regeneration and writing onto one or more replacement hard disks of all the data from a failed hard disk in a redundant RAID array. Rebuild is usually performed in the background while applications are accessing data in the array. reconstruction See rebuild. redundancy Maintaining duplicates for any given component in a system so the system can automatically replace a failed component with a working substitute. A parity RAID array's members are redundant since surviving members may collectively replace the data from a failed hard disk. Glossary-5