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Windows7 RAID-0 4xSSD . Why am I so slow?

Last response: in Storage
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November 12, 2009 4:58:36 PM

So, I'm running a clean install of Windows7 Ultimate x64. I have 4 Crucial 64GB SSD Drives which are very fast drives They are spec'd to run 200MB/s Read, 150MB/s write as a single drive.. I have never installed anything on these drives before and all of this was done from scratch. Look at these drive specs, RAID-0 Setup and my benchmark results... Any ideas???? :??: 



November 12, 2009 5:57:23 PM

I got same problem. with a 2xCrusial 64gb ssd Raid-0 Setup also running W7 tweaked for ssd.
Guess we might be facing the same problem, so i am listening!

This is my result with CrystalDiskMark 2.2

2x 64gb Crucial m225 SSD Raid-0:
Sequential Read : 255.294 MB/s
Sequential Write : 187.550 MB/s
Random Read 512KB : 260.970 MB/s
Random Write 512KB : 183.780 MB/s
Random Read 4KB : 28.841 MB/s
Random Write 4KB : 28.062 MB/s
Test Size : 100 MB

2x 1tb WD Black in Raid-0:
Sequential Read : 267.750 MB/s
Sequential Write : 193.583 MB/s
Random Read 512KB : 78.473 MB/s
Random Write 512KB : 211.344 MB/s
Random Read 4KB : 1.310 MB/s
Random Write 4KB : 4.509 MB/s
Test Size : 100 MB


As you see the WD beats the ssd ind both Sequential Read and Write. I am very satisfied with the WD Blacks result. but very unhappy with the SSD's result.

EDIT: Both setups have a 128kb stripe size.
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November 12, 2009 7:55:30 PM

I'm thinking it might just be the Crucial drives. Is that possible you think? I don't see any reason for this.
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a c 127 G Storage
November 12, 2009 7:56:40 PM

No, you used the wrong benchmark.

Go download HDTune Pro and run the "File Benchmark" and you should get proper values.
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November 12, 2009 8:16:31 PM

Thanks for the good info! I am much more satisfied about my purchase now. lol.



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November 12, 2009 9:32:21 PM

I think people are getting a little confused about SSDs. They are not meant to be super fast drives that blitz HDDs, rather they have a near instant seek speed compared to HDDs so that random seek operations are faster.
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a b $ Windows 7
a b G Storage
November 13, 2009 12:58:40 AM

You should enable the write-back cache, since it appears that you haven't.
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a c 127 G Storage
November 13, 2009 10:23:11 AM

Enablin the write-caching option would indeed show higher standard HDTune benchmark scores; but people should know this benchmark produces WRONG results for RAID arrays. Its a single-queue 32KiB raw benchmark, while filesystems will have a much higher queue depth for sequential access.

If you're on a RAID, be sure to use proper benchmarking utilities. You may think that your performance sucks while in fact its just the benchmark application which is doing things so low-level synthetically that its results are useless. Filesystem performance is actual performance; including all fragmentation and filesystem optimizations.

Enabling the 'Write Caching' option in Intel ICHxR RAID drivers will enhance performance even more, but the first benchmark the OP posted is clearly wrong and this is known to the author of HDTune. But he doesn't want to change the benchmark. Sadly, lots of people think their RAID underperforms because of this and go for a slower solution instead that produces higher HDTune scores.
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