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What is the difference between RAID 10 and 0+1?

post #1 of 12
Thread Starter 
I know the structural differences, but are there any performance or other differences?
Is one easier to rebuild a damaged drive than the other?

thanks!
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post #2 of 12
Raid 0+1 is the same as RAID 10

Read HERE, on the paragraph of NESTED RAID
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post #3 of 12
Quote:
Originally Posted by Nevaziah View Post
Raid 0+1 is the same as RAID 10

Read HERE, on the paragraph of NESTED RAID
They are NOT the same.

http://www.acnc.com/04_01_0_1.html
Quote:
RAID 0+1 is NOT to be confused with RAID 10. A single drive failure will cause the whole array to become, in essence, a RAID Level 0 array
If any drive in RAID0+1 fails, the whole array becomes RAID0. If another drive fails, all data is lost.
If any drive in a RAID10 fails, the whole array becomes RAID1. It can take at least another drive before all data is lost. It is possible that a 4xRAID10 to survive 3 HD failures.
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post #4 of 12
Damnit, i got confused. it's Raid 1+0 that is the same as raid 10 my mistake.

So you're compairing raid 1+0 to raid 0+1 right?

So there are four drives, A, B, C and D

in raid 0+1, A and B would be stripped in raid0 and C and D would be stripped in raid0 to mirror the array composed of A and B.

in RAID 1+0 then A and be would be MIRRORED and C and D would be stripped in RAID0 to mirror A and B(which are the same)

Technically, A and C could fail, and the raid0 partition would fail, but you'd still have access to B which is mirroring A, so Raid 1+0(raid 10)provides more safeguards.
From the performance side, it is so complex I will have to look at real benchmarks.
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post #5 of 12
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post
They are NOT the same.

http://www.acnc.com/04_01_0_1.html


If any drive in RAID0+1 fails, the whole array becomes RAID0. If another drive fails, all data is lost.
If any drive in a RAID10 fails, the whole array becomes RAID1. It can take at least another drive before all data is lost. It is possible that a 4xRAID10 to survive 3 HD failures.
how could you lose up to 3 drives???
in a 4x drive setup each drive would be mirrored once, so you could lose up to 2 drives (depending on drive)...
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post #6 of 12
Quote:
Originally Posted by bruestle2 View Post
how could you lose up to 3 drives???
in a 4x drive setup each drive would be mirrored once, so you could lose up to 2 drives (depending on drive)...
My bad.... You are right.

In a 4xRAID0+1, you can lose 1 drive and be ok. You may survive a 2 drive failure if both drives are part of the same stripe. In a 4xRAID10, you can lose only 1 drive and still be ok. You can survive a 2 HD failure as well in more cases. This all is on the assumption that multiple simultaneous drive failures. This is extreme rare in desktop environment unless something else is wrong like an exploding PSU. For a single user, RAID10 or RAID0+1 is fine.
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post #7 of 12
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post
My bad.... You are right.

In a 4xRAID0+1, you can lose 1 drive and be ok. You may survive a 2 drive failure if both drives are part of the same stripe. In a 4xRAID10, you can lose only 1 drive and still be ok. You can survive a 2 HD failure as well in more cases. This all is on the assumption that multiple simultaneous drive failures. This is extreme rare in desktop environment unless something else is wrong like an exploding PSU. For a single user, RAID10 or RAID0+1 is fine.
WOW, that is the 2nd time I corrected you this week!
Anyway, Thank you for all the information rep+
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post #8 of 12
Quote:
Originally Posted by bruestle2 View Post
WOW, that is the 2nd time I corrected you this week!
Anyway, Thank you for all the information rep+
It's a bad week for me. Been busy at work fixing my bad coding.....
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post #9 of 12
Quote:
Originally Posted by bruestle2 View Post
WOW, that is the 2nd time I corrected you this week!
Anyway, Thank you for all the information rep+
Lol, no one ever says "Your wrong" to duckie. Even when he is wrong the corrector uses questions lol.
I find that amusing.

And i learned about RAID!
post #10 of 12
Quote:
Originally Posted by Dezixn View Post
Lol, no one ever says "Your wrong" to duckie. Even when he is wrong the corrector uses questions lol.
I find that amusing.

And i learned about RAID!
I am wrong a lot... just construct the answer open endedly.
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