Raid

Uriel

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Wondering what it is exactly. I know it involves 2 or more hard drives but what are the benefits and the effects?
 
I'm no expert but I know it involves better performance from the drives, also know that it sucks more in windows and is godlike on linux.
 
its used fer gettin ridda them danged ol' bee's nests!

Oh..Heh..
I'm not completely knowledgeable on this either, but I'll give it a shot and tell you what I do know.

RAID stands for Redundant Array of Independent Disk.

They can be used to make 2 drives act as one, or mirror one drive using the second drive.

There are varying levels of RAID, but the most popular are 0 and 1. RAID 0 (Striped) is two disks acting as one. For example 2x500GB hard-drives would create 1 terabyte of data storage. Since you have two heads reading/writing information, you increase the performance because of the better bandwidth. If one drive fails, data on both drives are lost.

RAID 1 (Mirrored) is one disk creating a duplicate copy of the other. For example 2x500GB hard-drives in a RAID 1 array would allow you to have data security. If one drive fails, you have a duplicate drive still working. Replace the defective hard-drive, let the mirror rebuild, and you're set.

There are some higher ones like 3, 4, 5, and 6, but I don't know much about those, except that some of those levels have parity.

Then there are the variations (or nested RAID) of it, such as RAID 0+1 or RAID 1+0.

RAID 0+1 would be a striped mirror. Four drives are needed. 2 drives are striped together, and 2 drives are mirroring those first 2.

Some of the more advanced information on RAID, like RAID 3, 4, 5, 6, 0+1, etc is on Wikipedia.

Standard RAID levels, then underneath that is more information on Nested levels, like 0+1, etc.
 
RAID 0 - faster transfer speeds possible but a bit more latency. It doesn't shine nearly as much in Desktop use as it does in Workstation/Servers. Also less reliable (double the chance of failure).

RAID 1 - It's to keep a computer up and running if one drive dies. Basically opposite goal of RAID 0. But not to be used as means for backup. (If something happens to your PC as a whole your files are screwed on both drives)
 
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