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Penguin Magazine: Software RAID

Apr 11, 2000, 06:26 (0 Talkback[s])
(Other stories by Scott R. Haven)


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[ Thanks to Raul for this link. ]

"RAID is defined as a "Redundant Array of Inexpensive Disks." Simply put, it is the process of combining two or more partitions to create a single logical device. This logical device will then be used in place of the combined partitions. While RAID can be used in many different configurations, known as "modes", we will be covering only the most popular configurations in this article."

"RAID 0 (striping)
... Two or more partitions are combined to form one logical unit, which will then be the sum of its physical partitions. Data written to the logical unit will be dispersed among the physical partitions."

"RAID 1 (mirroring)
... Two or more equally sized partitions are combined into one logical device. Data is written to all of the partitions simultaneously, and read from the partitions in parallel. Each partition is a duplicate, or "mirror," of the others."

"RAID 5 (striping with parity)
... Several equally sized partitions are combined to form one logical device. Data and parity information is dispersed among the available partitions. Parity data is divided equally among the partitions. Should one of the partitions be come unusable, the missing data will be reconstructed from the remaining partitions."

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