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Raid 0 - 2ssd or 3

post #1 of 12
Thread Starter 
Hi all, I was wondering if you could help me figure out something. I am building a new rig and wanted to do 3 ssd in raid 0 (for performance, I have a back up running so no raid 5). I bought the Asus Sabertooth x58 combined with my memory sticks a couple months ago while it was on sale and now I'm getting around to buying the rest of the parts to put it all together. Well I just realized (/bonk my head) that that MB only has 2 sata3 6gb/s ports.

So what I'm wondering now is will I actually see that big of a difference in a 3ssd array over just 2 (if it was all set up on sata3)?

If so, will I be able to install the 3 drive array with 1 connected to a sata2 port? If so, what is the performance difference between a 2ssd sata3 array and the 2 sata3+ 1 sata2 array?

Finally, if the 2 different sata connection array doesn't work, what will the performance difference be between a 2ssd sata3 array and a 3ssd sata2 array?

I know this is confusing, thanks all for any info!
post #2 of 12
You lose TRIM when you RAID SSDs, and there are absolutely no real world benefits. I would recommend reconsidering RAID0 on SSDs.

Just get a single good SATA3 SSD. If you have more money, just get the biggest possible. Larger SSDs perform better, much better actually. It'll perform better than a raid 0 SSD setup of smaller SSDs after a months worth of use due to a combination of TRIM and the fact larger SSDs are faster.
Edited by Murlocke - 7/26/11 at 9:05am
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post #3 of 12
Thread Starter 
This rig will be stricktly for gaming and not a lot of write/re-write over time. Does that make a difference when considering TRIM?
Edited by Perps - 7/26/11 at 10:05am
post #4 of 12
Thread Starter 
Anyone else want to give there 2 cents please?
post #5 of 12
If you get a SSD with decent GC (Sandforce 2xxx series has been solid for me so far) then TRIM doesn't really matter.

About sata 3g vs 6g...
3xSATAII 3G = 3x300MB = 900MB
2xSATAIII 6G = 2x600MB = 1200MB

I would say you are better off with 2 solid sata 6G drives. Just make sure you stay away from ASYNC memory in those drives. IT is TEH suck when you start to fill it up.

Also for the money... a 480GB SSD costs 3-4x a 240GB drive and 6-8x a 120GB drive. You will get wayyyyyyy better performance out of the 2x drive configuration than any 480GB drive. Also with the newer controllers, anything above 240GB is just wasted space with larger memory modules... there is no performance benefit at this time above 240GB on a single drive. It has to do with the number of channels on the SSD controller. The 480GB drives just use higher density chips... not more chips.
Edited by slavearm - 7/26/11 at 3:07pm
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post #6 of 12
The 2 sata6 ports are the Marvell controller and the 6 sata3 are the Intel so for a 3 drive raid you'll have to use the Intel. Also the sata6 Marvell controller is not as good as Intels sata3 and there's a good chance you'll see better performance on Intel for an SSD raid0 even with it's lower bandwidth per channel.

Beyond that it's access times and IOPS where SSD's really shine and raid0 doesn't increase either. I'm not sure you'll notice a difference outside of benchmarking (unless your manipulating large files) running them in or out of raid.

I'd prolly run them as separate drives, you'd benefit from trim and simultaneous disk access.
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post #7 of 12
I dunno that I agree with everything said there Darren9. I see where you are going with what you are saying, but IOPS go through the roof in R0, and access times under higher queue depths go down as well. Plus the GC on sandforce drives is good enough that it pretty much so makes TRIM irrelevant.
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post #8 of 12
I could be wrong , loading up a high end raid card with fast SSD's and subjecting it to a heavy access/high disk queue environment will produce results, loading up an onboard controller (AFAIK ICH10R has around a 600MB/s global limit) in a desktop environment (typically low access\\queue) may not be so noticable. I'm not sure how well the GC on Sandforce drives works, just a generalization that (most) SSD's preform better with trim.
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post #9 of 12
Thread Starter 
Good info guys, thank you. I will think about my options and probably do some testing.
post #10 of 12
Quote:
Originally Posted by Perps View Post
Good info guys, thank you. I will think about my options and probably do some testing.
You're wasting your money if you're under the impression that a striped array will help your game load times or zoning times. All Raid will help is tossing around massive video files back and forth (sequential).
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