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Raid - help?

post #1 of 5
Thread Starter 
ok the last time i ran into raid was few years ago on a asus mobo,

so can someone explain wat raid is and what is the purpose. i thought there was only raid 0 and raid 1 but now there is like raid 3 or 4 or 5. or something.

all i know is you can set two hdds in mirror (copy cat ing) or striping (sharing)

acually i dont' even know if thats right. thats all i remember from about 4 or 5 years ago when i first ran in to raid.
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post #2 of 5
There are many types of raid, basically:

Raid 0 - striping, splits data into two hard disks( faster data transfer)
Raid 1 - Mirroring/Duplexing, basically copies the data on two hard drives, so if one fails, the other takes place. Duplexing is better since you have two controllers, mirroring occurs with one controller, and can be set from windows itself. (advantage from software raid, you can split hd into partitions, advantage from hardware raid, processing occurs on the card itself and doesnt use the cpu for caching ect..)
Raid 5 - Parity checking (If you have Missing or corrupt data, the parity check tries to re construct the missing data from segment)
Raid 10 - is raid 1 and raid 0 combined, you have data redundancy and faster performance combined. you need 4 hdisks min.

Those are the most common raid types, raid 2,3,4 are similar to raid 5, however raid 5 is more reliable than 2,3,4.
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post #3 of 5
Quote:
Originally Posted by neocarl View Post
There are many types of raid, basically:

Raid 0 - striping, splits data into two hard disks( faster data transfer)
Raid 1 - Mirroring/Duplexing, basically copies the data on two hard drives, so if one fails, the other takes place. Duplexing is better since you have two controllers, mirroring occurs with one controller, and can be set from windows itself. (advantage from software raid, you can split hd into partitions, advantage from hardware raid, processing occurs on the card itself and doesnt use the cpu for caching ect..)
Raid 5 - Parity checking (If you have Missing or corrupt data, the parity check tries to re construct the missing data from segment)
Raid 10 - is raid 1 and raid 0 combined, you have data redundancy and faster performance combined. you need 4 hdisks min.

Those are the most common raid types, raid 2,3,4 are similar to raid 5, however raid 5 is more reliable than 2,3,4.
RAID 0+1 is also a common one as well.

There are actually a few dozen types of RAID. Some are proprietary sold by one company only and some others are therotical only. You can also layer RAID like 0+5+0 as well.

RAID 2,3,4 are not that similar nor more reliable than RAID5. Each has advantage or disavantage.. including cost.
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post #4 of 5
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thanks alot
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post #5 of 5
np
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