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RAID 5 or 0+1?

post #1 of 9
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So my friend's recently finished his build and is now looking to RAID his 6 WD Caviar Black 2TB hdd's. He's still debating whether or not to use RAID 5 or RAID 0+1. He finds 0+1 a bit more straightforward, but RAID 5 would give him more or less 10TB of space from what I understand (which isn't that much). However, he seems a bit wary of RAID 5, mostly because he doesn't understand it that well (neither do I). He's tried RAID 0+1 through the bundled software (Intel Rapid Sotrage Technology), but he can't select more than 4 drives for some reason. So right now, one of two things basically:

1. How safe is RAID 5 compared to 0+1 and a basic summary of it.
or
2. How to select 6 drives for RAID 0+1 through Intel Rapid Storage Technology.

Thanks in advance!
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post #2 of 9
Quote:
Originally Posted by alwang17 View Post
So my friend's recently finished his build and is now looking to RAID his 6 WD Caviar Black 2TB hdd's. He's still debating whether or not to use RAID 5 or RAID 0+1. He finds 0+1 a bit more straightforward, but RAID 5 would give him more or less 10TB of space from what I understand (which isn't that much). However, he seems a bit wary of RAID 5, mostly because he doesn't understand it that well (neither do I). He's tried RAID 0+1 through the bundled software (Intel Rapid Sotrage Technology), but he can't select more than 4 drives for some reason. So right now, one of two things basically:

1. How safe is RAID 5 compared to 0+1 and a basic summary of it.
or
2. How to select 6 drives for RAID 0+1 through Intel Rapid Storage Technology.

Thanks in advance!
I'm not entirely sure on everything, and personally I've never used raid0+1.

Raid5 will allow one drive to die without any data loss. It's fairly straight forward too in terms of how much storage you'll have. Raid5 is essentially all the data minus one drive. So if you have three drives, it's going to be the capacity of only two of the drives. Or if you have four it'll be the capacity of three.

For general reference, say you have four 2TB drives.
In raid0 it's 8TB total capacity.
In raid1 it's 2TB total capacity.
In raid5 it's 6TB total capacity.
In raid 0+1 it's 4TB total capacity.

This calculator can help you if you don't want to read up on the differences between raid configurations: http://www.ibeast.com/content/tools/...c/RaidCalc.asp

The way raid 0+1 works is you have two raid0 arrays that are in a raid1. Raid1 is a mirror, where as raid0 has all the drives work together for increased performance to simplify the concept.

So as far as reliability goes, it's two arrays. Like this image:

If one drive dies, you'll be fine since it's mirrored. But as you can see, if two drives die on each side that have the same data stored, the array will fail.

In raid5 if any one drive fails, the array is fine, but if two drives fail the array fails. So raid0+1 is slightly more reliable.

I've never used Intel Rapid Storage Technology so I can't help much, but in theory I think you need to make two raid0 arrays then mirror them to complete a raid0+1 array. Again, I've never made a raid0+1 array so I can't be certain.

Good luck!
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post #3 of 9
Just for light/home-use storage I would use RAID 5.

RAID 0+1 cuts your capacity in half, therefore would net '6 TB' of space.
RAID 5 uses one drive's worth of space for parity, therefore would net '10 TB' of space.

0+1 performs a bit better on writes than 5, both can tolerate one drive failure (0+1 can support up to three as in the above diagram but they must be on the same RAID0 subset).

Personally if you were considering 0+1, I would use 1+0 instead.



Same capacity losses, but you can lose a drive on each RAID1 member and still have all of your crap. Also, a rebuild will be limited to your RAID1 member 'sub-array' instead of having to go up a level and rebuild across to multiple drives/arrays.
Edited by beers - 4/10/11 at 3:29am
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post #4 of 9
Thread Starter 
For RAID 5, if one drive fails, all you would need to do is replace the dead drive and it will rebuild the data? That's what I understand from reading everything else.

Since in this case the number of drives is 6, the RAID 0+1 is slightly higher. But since we're having issues with the Intel software, are there any other software-based RAID programs to work with?
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post #5 of 9
Quote:
Originally Posted by alwang17 View Post
For RAID 5, if one drive fails, all you would need to do is replace the dead drive and it will rebuild the data? That's what I understand from reading everything else.

Since in this case the number of drives is 6, the RAID 0+1 is slightly higher. But since we're having issues with the Intel software, are there any other software-based RAID programs to work with?
Yes, you should be able to simply replace the dead drive.

I've always set up arrays from the bios, so I'm not aware of any software. Did you receive any software intended for setting up raid with your controller?
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post #6 of 9
erm

I think the final drive size might be too big?
post #7 of 9
Thread Starter 
Quote:
Originally Posted by Shrimp View Post
Yes, you should be able to simply replace the dead drive.

I've always set up arrays from the bios, so I'm not aware of any software. Did you receive any software intended for setting up raid with your controller?
If it's EFI then you still should be able to set up the array? The sofware in question is just the Intel Rapid Storage Technology. He has a Sandy Bridge setup and he's building the array off the P67 controller. The Marvell controller on his motherboard is for his boot SSD and BR/DVD drives (mobo is ASUS Maximus IV Extreme btw).

Quote:
Originally Posted by prjindigo View Post
erm

I think the final drive size might be too big?
Too big? As in...
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post #8 of 9
Quote:
Originally Posted by alwang17 View Post
2. How to select 6 drives for RAID 0+1 through Intel Rapid Storage Technology.
Its RAID 10 not 0 + 1 that RST supports plus it does not support 6 drives in RAID 10.
RAID 5 extreme!
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RAID 5 extreme!
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post #9 of 9
Quote:
Originally Posted by alwang17 View Post
If it's EFI then you still should be able to set up the array? The sofware in question is just the Intel Rapid Storage Technology. He has a Sandy Bridge setup and he's building the array off the P67 controller. The Marvell controller on his motherboard is for his boot SSD and BR/DVD drives (mobo is ASUS Maximus IV Extreme btw).
In that case he should set it up from the UEFI setup as opposed to using that software.
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