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6GB/s SSD Raid 0 Questions.

post #1 of 7
Thread Starter 
I see there's alot of confusion surrounding 6GB/s SSD's in raid 0. Motherboards supporting "true 6GB/s raid" actually don't, it seems. So I'm on the market for a good raid controller. I haven't been able to find any solid information as of yet, so here I am asking you fellas.
I'd like advice on which raid controller to choose to achieve stable, high raid 0 speeds, with Crucial C300's. Hopefully something fairly easy to set up, as I haven't experimented with PCI raid controllers in the past.
Many thanks.
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post #2 of 7
The problem is that TRIM is currently not supported in SATA 3. Even if Dos may recognize the TRIM command being active, it doesn't mean its being passed. You really don't need a RAID controller for a simple RAID 0 array but if you are hell-bent on getting one, maybe if you gave us a budget we could actually help you.

Hope you found this helpful.
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post #3 of 7
Thread Starter 
Price isn't much of an object. I've seen benchmarks showing upwards of 700mb/s read speeds on my C300's in raid 0, using a Highpoint Rocketraid 640 controller, but I've found nothing in terms of "how to."
I'd like to know more.

Edit: Keep in my C300's use garbage collection while TRIM is not active. As far as I know, this will serve just as well; don't be afraid to tell me if I'm wrong, though.
Edited by Mookster - 2/7/11 at 12:59pm
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post #4 of 7
Quote:
Originally Posted by Mookster;12298235 
Price isn't much of an object. I've seen benchmarks showing upwards of 700mb/s read speeds on my C300's in raid 0, using a Highpoint Rocketraid 640 controller, but I've found nothing in terms of "how to."
I'd like to know more.

Edit: Keep in my C300's use garbage collection while TRIM is not active. As far as I know, this will serve just as well; don't be afraid to tell me if I'm wrong, though.

The only reason to get a RAID controller is to take the load of the CPU. In RAID 0 there is a negligible load on the cpu so i really don't see the point in investing in one. With your default RAID controller you will see read speeds of over 700MB/s.

What do you mean "how to?". The RAID controller gives you the option of selecting it as the default controller in your BIOS. All computational load is then shifted to the microprocessor on its PCB. Note that a RAID card can get pretty hot, make sure you don't have a stuffed case.
Edited by Razultull - 2/7/11 at 2:19pm
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post #5 of 7
Thread Starter 
Quote:
Originally Posted by Razultull;12298765 
The only reason to get a RAID controller is to take the load of the CPU. In RAID 0 there is a negligible load on the cpu so i really don't see the point in investing in one. With your default RAID controller you will see read speeds of over 700MB/s.

What do you mean "how to?". The RAID controller gives you the option of selecting it as the default controller in your BIOS. All computational load is then shifted to the microprocessor on its PCB. Note that a RAID card can get pretty hot, make sure you don't have a stuffed case.
That's just the thing, one would think you could simply put your C300's in raid zero using your onboard Sata III controller, but Marvel's actually decreases your performance when in raid 0. ICH1OR can manage 6GB/s SSDs in raid 0 better than Marvel's Sata III controller. With ICH1OR you will see tapped out Sata II speeds. With Marvel's, you will see 250/250 read/write. Meanwhile, if you introduce a PCI raid controller (granted, with those SAME Marvel chips) you'll get your 700MB/s reads.
I don't understand why.
Examples can be seen in threads like these: http://forum.crucial.com/t5/Solid-State-Drives-SSD/Marvell-Vs-ICH10R-Vs-Highpoint-640-Single-RAID/td-p/18454
Edited by Mookster - 2/7/11 at 6:03pm
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post #6 of 7
Quote:
Originally Posted by Razultull;12298765 
What do you mean "how to?". The RAID controller gives you the option of selecting it as the default controller in your BIOS. All computational load is then shifted to the microprocessor on its PCB. Note that a RAID card can get pretty hot, make sure you don't have a stuffed case.

I agree with the OP. I too want to know about this. On my Rampage III Mobo the MArvell Controller for the 2X Sata 3 connects seems to be garbage. I also have two C300's. Anyone know if there is a driver solution for the onboard Marvell controller on the ASUS boards? I get better performance in RAID0 with the Sata 2 connection. That definitely shouldn't be the case...
    
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post #7 of 7
Thread Starter 
Quote:
Originally Posted by Senator;12302104 
I agree with the OP. I too want to know about this. On my Rampage III Mobo the MArvell Controller for the 2X Sata 3 connects seems to be garbage. I also have two C300's. Anyone know if there is a driver solution for the onboard Marvell controller on the ASUS boards? I get better performance in RAID0 with the Sata 2 connection. That definitely shouldn't be the case...
MSI says it's a Marvell hardware limitation and their "2x sata III performance in raid 0" advertisement now has a disclaimer saying "not recommended for SSD's." Asus still advertises as "true 6GB/s raid."

So far the only place I've seen proper raid 0 speeds for C300's is with that rocket raid 640 controller ~ $200, and it has the same Marvell 9128 chips that I have onboard.

If you're interested, take a look at the benchmarks.
This is ICH1OR raid 0 with c300's(SataII)
http://img829.imageshack.us/img829/22/ich10rraid0c300x2forcru.jpg
And this is the Rocket Raid 640 raid 0 with c300's (Sata III)
http://img842.imageshack.us/img842/663/raidhpt640forcrucialfor.png

It seems that ICH1OR would give you a better actual experience than even the Rocket Raid setup, even though you'll get higher sequential reads with the RR640.
The trouble people have been having with these new raid controllers is astounding, though. I did a little bit more research to find out if it was just the people, or the product; it turns out it's a bit of both. All of the 6GB/s raid controllers on the market are hit and miss right now, and you'd be lucky if you get one to work with your build.
I guess it'll have to be ICH1OR for a while.
Edited by Mookster - 2/8/11 at 6:25am
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