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SSD + RAID0 question

post #1 of 14
Thread Starter 
Hey, hard drives are not something I know a lot about and I have a quick question. I have a Mushkin Callisto Deluxe 60GB SSD coming in that I will be using as a boot drive, and I have 2 brand new WD 500GB SATA3 drives laying around that I want to use in RAID0. I will be using my WD 1TB SATA2 for backup/extra storage. Now my question is how in the heck do I hook all these up for the best performance? I have 2 Marvell SATA3 ports, 2 Intel SATA3 ports, and 4 SATA2 ports. AFAIK, it's not good to use the Marvell ports with a bootable drive, but I also can't use them with RAID. Also I heard that I can't use AHCI and RAID on the same controller, but if I don't use my SSD on an AHCI controller, performance will suffer and I won't be able to use TRIM. Correct me if I'm wrong on anything redface.gif

Sorry if this post is unclear, feel free to ask for clarification on anything! Thanks and +REPs for help!
    
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post #2 of 14
hmmm well i remember reading that some of the SataIII Marvell controllers (last time i checked was 2010) will give you a reduced raid 0 performance on ssd vs using an intel sataII controller with ssd raid 0. And yes with raid0 you do loose trim capability if its 2 SSD you raid together im pretty sure.

Prob do raid on the sataII and put you ssd on your intel sataIII i would say
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post #3 of 14
Thread Starter 
Thanks for your answer. Will running at 3GB/s negate the performance increase I am getting from RAID0?
    
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post #4 of 14
Quote:
Originally Posted by Dissentience;13448761 
Thanks for your answer. Will running at 3GB/s negate the performance increase I am getting from RAID0?

hmm well a test ive read the intel chipsets max read write speeds somewhere between 500-600mbs (and a max i believe that sata2 on ssd controlers get is about 280mbs with sandfoce (on ssd) controller). but you should still see a raid 0 performance increase with most hdds (wont be a 100% scale maybe a 50% read speed increase. so 100mbs single hhd speed lets say and in raid 0 150mbs it could go to).

edit: i dont believe any mech HDD can max out sataII (sata 3gb) so you should see some increase in performance
Edited by DNytAftr - 5/9/11 at 9:57pm
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post #5 of 14
Quote:
Originally Posted by Dissentience;13448761 
Thanks for your answer. Will running at 3GB/s negate the performance increase I am getting from RAID0?

The 3GB/s is per channel, so every drive has that much bandwidth available for itself (theoretical maximum; real life performance varies) regardless of whether it's in a RAID array or not. Your RAID would only be limited by the speed cap if your drives can push more data than that; however, mechanical hard drives can't saturate the channel anyways.

Newer SSDs are capable of pushing quite a bit more data. In that case, the 3GB/s would be a bottleneck since your drives can operate faster than that.
Edited by BirdofPrey - 5/10/11 at 5:08am
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post #6 of 14
Quote:
Originally Posted by BirdofPrey;13451656 
The 3GB/s is per channel, so every drive has that much bandwidth available for itself (theoretical maximum; real life performance varies) regardless of whether it's in a RAID array or not. Your RAID would only be limited by the speed cap if your drives can push more data than that; however, mechanical hard drives can't saturate the channel anyways.

Newer SSDs are capable of pushing quite a bit more data. In that case, the 3GB/s would be a bottleneck since your drives can operate faster than that.

well in his case his drives are sataII (280-285mbs read) from what i could google, so he should be able to hit max speed (or around that) with his sata controllers since he would be well under any caps. If he had 2 ssd in raid0 then he prob would have a bottleneck and only would get ~500mbs read instead of 570mbs using the sata II ich
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post #7 of 14
Thread Starter 
Dang, so when I select RAID mode, it changes both the SATAII and SATAIII ports to RAID. Looks like my only choice is to set the Marvell controller as bootable/AHCI mode and plug my SSD into that, while I have my 2 500GB drives in RAID0 on the 6GB/s Intel ports.
    
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post #8 of 14
I'm not all that familiar with onboard RAID controllers, since I usually go with external controllers if I am doing a RIAD setup.

Still when you set up RAID mode, it should activate a separate BIOS (which will come up after your main BIOS finishes POST) for the RAID controller. You have to go into that and set up your RAID arrays. Have you gone in there and set the HDDs on one array and the SSD on a seperate one? (or does it not have that feature)

If that doesn't work, you can always go the software route. Once Windows is installed and booting from the SSD right click computer on the start bar and go to manage. under disk management you can select the HDDs and make a virtual drive with them.
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post #9 of 14
Thread Starter 
Quote:
Originally Posted by BirdofPrey;13482309 
I'm not all that familiar with onboard RAID controllers, since I usually go with external controllers if I am doing a RIAD setup.

Still when you set up RAID mode, it should activate a separate BIOS (which will come up after your main BIOS finishes POST) for the RAID controller. You have to go into that and set up your RAID arrays. Have you gone in there and set the HDDs on one array and the SSD on a seperate one? (or does it not have that feature)

If that doesn't work, you can always go the software route. Once Windows is installed and booting from the SSD right click computer on the start bar and go to manage. under disk management you can select the HDDs and make a virtual drive with them.

I have the RAID array set up fine with the 2 disks. I can put other drives on the Intel controller and leave them out of the array, but there's no way to set the non-RAID drives on the Intel controller in AHCI mode, which I need for TRIM to work on the SSD.

I could just plug the 2 drives into the Marvell controller and use Windows to make the RAID array, but I heard software RAID was unreliable and had worse performance. Also I will be wanting to use the RAID array on my Linux distro as well.
    
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post #10 of 14
No there is trim support for the SSD... just as long as the SSD is NOT in RAID mode with another SSD... THEN you will lose trim support...

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