Learn about the technologies behind the Internet with The TCP/IP Guide!|
NOTE: Using robot software to mass-download the site degrades the server and is prohibited. See here for more.
Find The PC Guide helpful? Please consider a donation to The PC Guide Tip Jar. Visa/MC/Paypal accepted.
|View over 750 of my fine art photos any time for free at DesktopScenes.com!|
[ The PC Guide | Systems and Components Reference Guide | Hard Disk Drives | Hard Disk Performance, Quality and Reliability | Redundant Arrays of Inexpensive Disks (RAID) | RAID Levels | Technical Factors Differentiating RAID Levels ]
RAID levels differ in terms of the controller required to implement them. In general, simple controllers implement simple RAID levels, while more complex RAID levels require more sophisticated (read: expensive) controllers. Some levels don't require a dedicated controller at all, functioning acceptably using operating system or other software to manage the array (albeit at a performance price).
The simplest RAID levels, often supported by software RAID or low-end controllers, include RAID 0, RAID 1, and RAID 0+1 or 1+0 (though many low-end controllers only support one or the other, not both.) Some lower-end controllers include support for the popular RAID 5 level, and so do some software RAID implementations, but at a rather severe penalty in terms of performance and advanced features. RAID levels 3, 4, 6 and 7, and the other more esoteric multiple RAID levels such as RAID 53 and RAID 30, usually require more capable controllers. RAID 2 is complex enough that it requires special, proprietary hardware; it has for this reason all but disappeared from the market.
Next: Hard Disk Requirements