QUOTE(Kal-el @ Oct 26 2009, 08:14 PM)
too complicated la that one, any simpler explanations?
Lol.
Well, first let's start with RAID 0, or data striping. What it does is it distributes the data that you write to it, or read from it, over two separate HDDs effectively boosting both read and write speeds. Take for example you are writing a 100MB file to your HDD. With a RAID 0 configuration, your system will write 50MB to one HDD and the other 50MB to the second HDD. The one problem with this is data security. Should one disk fail, you will lose all your data.
RAID 1 is for redundancy and is also called data mirroring. Unlike RAID 0, it offers no performance boosts. What it does instead is it will write the theoretical 100MB file I mentioned above to both your HDDs. This means that even if there is a failure of a single HDD, you still have a perfect back-up in the form of your second, mirrored drive.
RAID 10, or 1+0, does what its name suggests. It will first mirror data, then stripe it to two HDDs. Mind you this requires a grand total of four HDDs but affords you the performance of a RAID 0 configuration and the redundancy of RAID 1.
RAID 0+1 or RAID 01 practically does the same thing, with it striping data before mirroring, as the name suggests.
RAID 5 and 6 are called data striping with parity and frankly they are quite complicated to understand. But the performance you can gain here is minimal as compared to the aforementioned four other RAID arrays. One thing they do offer above all else is good read speeds, lousy writes and somewhat decent redundancy.
Did that answer your question?
This post has been edited by Loki[D.d.G]: Oct 26 2009, 08:32 PM