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4x HDD RAID 0? - Page 2

post #11 of 18
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How does 0+1 differ from 1+0 (10)? Is it safer and more reliable but with slower speeds?
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post #12 of 18
According to what I have read, RAID 1+0 and RAID 0+1 have the same kind of speed and capacity. The difference is how they handle failure. Look here for a more detailed explanation.

Quoted from the page:

Quote:
Mathematically, the difference is that the chance of system failure with two drive failures in a RAID 0+1 system with two sets of drives is (n/2)/(n - 1) where n is the total number of drives in the system. The chance of system failure in a RAID 1+0 system with two drives per mirror is 1/(n - 1). So, using the 8 drive systems shown in the diagrams, the chance that losing a second drive would bring down the RAID system is 4/7 with a RAID 0+1 system and 1/7 with a RAID 1+0 system.
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post #13 of 18
When you get past a 4 disk setup with 0 + 1 and 10 you see just how it works better but low end controllers mostly only allow a 4 disk setup and for RAID 10.

To go up from 4 disks you have to and up by a multiple of 2 so 4, 6 ,8... and still only get 50% of the storage.

In a 6 disk RAID 0 + 1 you have two RAID 0 each with three disks then you RAID 1 them two RAID 0.

In a 6 disk RAID 10 you have three RAID 1 each with two disks then you RAID 0 them three RAID 1.
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post #14 of 18
Quote:
Originally Posted by PeterUK View Post
... and still only get 50% of the storage.
This argument comes up time and time again with RAID 1 and its variants (RAID 1+0 and RAID 0+1). To me, it's a matter of perspective. I tend to look at it as having my (pre-determined) storage mirrored, rather than, "I lost half my storage! What BS is this?!!!oneone111eleven".
Edited by parityboy - 12/28/10 at 1:51pm
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post #15 of 18
Quote:
Originally Posted by parityboy View Post
This argument comes up tine and time again...
Errr...what argument? Wasn't looking to start one.
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post #16 of 18
Quote:
Originally Posted by PeterUK View Post
Errr...what argument? Wasn't looking to start one.
lol, I don't mean in an aggressive sense, more in a "my position vs your position" sense of the word, i.e "argument" = "these are the points I bring to a discussion about <pick a subject>".
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post #17 of 18
at least with raid 5 tho you will only lose 1 hard drive worth of space cause the parity bits are spread across the array like all the data in a raid 0, same goes with all the data put on raid 5.
 
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post #18 of 18
If all you care about is speed, go RAID0. If you want speed and SOME redundancy, go RAID5. If you want it to be the best secure configuration, go RAID10.

If you have all of your storage elsewhere (you say you have a server), then do RAID0, and just make sure you back any important data up, and make regular images of your drive in case of a failure.
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