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SSD for OS & Raid 5 HDD for Data/Games - Page 3

post #21 of 28
1. Yes, 4 drives are needed for RAID 10
2. Yes, 4 drives will give you 2TiB of usable storage
3. Yes, it's common practice to use that setup.
4. You could try creating a degraded RAID10 with three drives, format it as normal, copy your existing data to it, then make the single drive a member of the array, making the array "whole".
5. No idea.
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post #22 of 28
Quote:
Originally Posted by Wr3ckin_Cr3w View Post
Okay, so I've settled on Raid 1+0.
What made you decide on RAID 10?
post #23 of 28
[deleted]
Edited by parityboy - 8/7/11 at 12:24pm
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post #24 of 28
Quote:
Originally Posted by parityboy View Post
I already answered OP questions above.
Understood.

But what I want to know is _what_ of your answers (or other) pushed him to choose RAID 10.

Thanx for your info as well.
post #25 of 28
@ahriman

My last post was written before I realised I had answered the OP's questions already. Gonna edit it.

RAID 10 write performance is faster than RAID 5 or 6, since there's no parity to calculate. Also a 4-drive RAID 10 can lose one member from each pair and still keep going. Also, rebuilds are faster than RAID 5 or 6, and there's no performance penalty for writing small files.
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post #26 of 28
Quote:
Originally Posted by parityboy View Post
@ahriman
RAID 10 write performance is faster than RAID 5 or 6

And as I understand it the read performance is equal to (or faster than) RAID 5?
post #27 of 28
I seriously doubt this "raid 10 faster than raid 5"
Parity really isn't a big deal to compute. Even more so on small arrays like this.
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post #28 of 28
Quote:
Originally Posted by Infrabasse View Post
I seriously doubt this "raid 10 faster than raid 5"
Parity really isn't a big deal to compute. Even more so on small arrays like this.
You're right, I phrased that wrong. It's not about the processor's ability to calculate the parity, it's more about the number of disk operations involved in reading data, calculating parity and writing it onto the array. RAID 10 doesn't have this issue, which is why databases are usually on RAID 10 arrays - the performance of parity-based arrays is simply too poor.
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