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Installed 3x 1TB Barracuda 7200.14 in Raid5, is 30MB/s write speed normal?

megakoresh

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Joined
Jul 11, 2010
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5
So this is my first experience with Raid, and the system admin in college recommended Raid 5 for a "starter" solution, so I went and bought 3 Seagate Barracuda drives 1TB each, model 7200.14. I installed the array using my Mobo controller for now: Intel P67(B3) chipset (3Gb/s) on my Asus Sabertooth P67 Rev.3.

Then I ran this CrystalDiskMark test on both of the two partitions I created and they both showed around 30MB/s write speed in sequential test (I used 1GB test file). I thought Raid is supposed to increase performance, but that result is less than what the Barracuda is supposed to have on it's own. What might be going on?

Oh yeah Read speeds are normal 360MB/s on the same settings.
 
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BlueByte

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Feb 3, 2011
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Maynooth
If you want to experiment you can run software raid, it will take a small hit on the cpu but with modern PC's it wont be noticeable on anything you are probably doing. RAID 10, is snappy with low end chips.
 

odis172

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Oct 16, 2008
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Ottawa, ON
30MB you mean write speeds? That sounds about right, I found very poor write performance back when I was playing around with this stuff.
 

megakoresh

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Joined
Jul 11, 2010
Messages
5
You mean 30MB/s write speed? That is a bit low, but not un-normal for RAID5 on Intel chipsets.

This thread might help: http://www.hardwarecanucks.com/forum/storage/64992-question-about-raid5.html
Yes, sorry, I mean write speed. It's strange, I saw for example this video:
Adaptec 5805 Raid 5 Read Speeds and the guy had like 300MB/s write speeds. He had more drives (I suppose that helps??), but still 30 is less than the standard write speed of these drives, it's very strange that a Raid setups would have that.

Reading through that thread JD linked it seems Intel Mobo controllers are not the best for the job, which is something I already knew, but as I thought they said that it shouldn't be THAT low. And that was about 60MB/s. I have 30MB/s. I mean technically it is supposed to double the speed of the drives, no? Of course with some variation, but its 2 drives working at once (with one for backup) so it should be double the speed. Ok well accounting for a crappy controller maybe 1.3x the drive speed, but surely not friggin 30MB/s?

Do you think it is just because of the controller? Some of the college computers run on the same Intel controller chipset and all these drives are 7200RPM, and they have 100-200MB/s read speeds (no benchmark, only observed with actual file copies). Surely it shouldn't be THAT slow.

What could be causing it? Any suggestions on how to fix it? I saw the Software Raid suggestion, not sure about that, I have a good CPU (Intel i7-2600K), but I often run CPU-heavy tasks like video encoding or 3D rendering, and it's not so much the tasks I am worried about as they are still not gonna take insanely long, but rather causing problems with the disk setup if the programs and raid will start fighting for resources.

I don't want to buy a Raid controller until I know exactly what is all this stuff about. This speed is clearly too low, I need to know why and how to fix it, or else I just risk stepping into mud again when I do buy a controller.
 

megakoresh

Member
Joined
Jul 11, 2010
Messages
5
Alright guys: update.
I fixed it. Went to ASUS page for my Motherboard and downloaded a Chipset driver update (Intel Rapid Storage tech) for the controller for 8.1 x64 system. After restarting the benchmark shows 200+MB/s write speed. As people suggested ont he thread JD linked I also turned off Write cache buffer and let Intel drivers handle it. Thanks much!
 

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