Terrible Read speeds with RAID0 SSDs

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bpusef

n00b
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Sep 29, 2011
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Hello,

I recently bought 6 Patriot Wildfire SSDs along with an LSI 9265-8i raid controller. My choices for these were inspired somewhat by this articlehttp://++++++++++++.com/raid-enterprise/patriot-memory-wildfire-120-gb-ssd-review-wei-and-as-ssd/
I have four of the six drives connected to the RAID controller in RAID0 with regular, default settings. However, the read speeds seem terrible compared to what is advertised and what is shown on any benchmark of these drives. The RAID controller is supposedly one of the best. In fact the performance of the RAID array is barely any better than what I'm getting from just a single drive.

Here's an image comparing my benchmarks to the one featured in the article I linked above.
30l2ts6.png


The only differences are that my drive had data on it from the OS, but even when I create an array with formatted drives and boot off another drive, I get the same results.

Is there something just limiting the speed of the drives that much? The RAID card is SATA III and I'm definitely plugged into it as you can see from the screenshot. The depressing thing is this is an image of just one of the Patriot SSDs on the onboard SATA controller performing nearly as well.

jrfygj.png


I know these are synthetic benchmarks but honestly something's got to give with the RAID array. Even single drives are nowhere near the advertised 500MB/s.
 
Is the card on an adequate PCIe port (connected to the CPU, and not the southbridge) ?

Do you have the fastpath key ?
 
Even single drives are nowhere near the advertised 500MB/s.
Click to expand...

Although this has nothing to do with your problem the 500MB/s is somewhere between an unrealistic exaggeration and flat out lie. You will only get that if you read and write only 0s to the disk or other very highly compressible data.
 
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Watch out, I think 6gbps SAS controllers don't negotiate at SATA3 speeds with SATA devices.

That being said, I would honestly doubt that's the problem here.. What if you have single drives, do you get better performance? What's your stripe size?

What about a single drive on the controller? Are you using the latest drivers?
 
Aesma said:
Is the card on an adequate PCIe port (connected to the CPU, and not the southbridge) ?

Do you have the fastpath key ?
Click to expand...

Such an oversight! I completely forgot the second PCI-E is controlled by the SB.

Thanks so much. For anyone that cares, here's a new benchmark.

2lt0b51.png
 
can you run another as-ssd? I have the same controller with corsair drives, just want to see how it stacks up.
 
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