Thread: raid pci card
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Old 3rd June, 2005, 01:38 PM
Aedan Aedan is offline
Chief Systems Administrator
Join Date: September 2001
Location: Europe
Posts: 13,075

RAID is a technology that's been around for a while, but originally was designed for big servers. To give you context, it stands for "Redundant Array of Inexpensive Disks". Basically, it's a way of talking to disks that combines them into one disk. Many RAID configurations are actually redundant, in that a hard disk can fail and the system carries on working.

Common RAID "levels" are:
RAID0: Two or more disks combined into a single 'volume'. No redundancy, but you get all your space. Hence 2x 80Gb disks give 160Gb of space.
RAID1: Two or other even number of drives combined into a single 'volume'. Drives are in 'mirrored' sets, so there's always two copies, but you only get half your space
RAID5: A complex system that requires at least 3 drives, and splits data and error correction across the drives. Any one drive can fail, and the system will be ok. You get the space of all but one drive.
Any views, thoughts and opinions are entirely my own. They don't necessarily represent those of my employer (BlackBerry).
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