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Raided SSD's - write speed slow

2

2-loc

Weaksauce
Joined
Nov 15, 2011
Messages
91
Hi there, looking for a little help or confirmation.

I have 2 Kingston V100 64gb's raided. The max read/write for them individually are 250MB/s/145MB/s, and they benchmark for about that single drive wise.

The problem is when I raided them, the read speed jumped to 450MB/s, but the write speed stayed at 145 MB/s.

I have read somewhere that even if you raided ssd's, that write speeds would be the same as a single ssd due to MBTF halving themselves.

But from other websites reviews and other people's benchmarks, there write speeds seemed to have improved when raiding.

Any help would be appreciated.
 
What motherboard are you using, what specific ports on the motherboard are the two SSD's hooked to, how did you create the RAID (Intel BIOS, Marvell BIOS, Software etc) and are you booting from the RAID?
 
mwroobel said:
What motherboard are you using, what specific ports on the motherboard are the two SSD's hooked to, how did you create the RAID (Intel BIOS, Marvell BIOS, Software etc) and are you booting from the RAID?
Click to expand...

I'm using 990FXA-GD80.
I plugged them into the onboard ports, the ones designated on the motheboard as 0 and 1,
I used the AMD raid bios to setup the raid array.
I am booting from the array also.
My benchmarks are from atto benchmark utility.

Thank you very much for the help.
 
2-loc said:
I'm using 990FXA-GD80.
I plugged them into the onboard ports, the ones designated on the motheboard as 0 and 1,
I used the AMD raid bios to setup the raid array.
I am booting from the array also.
My benchmarks are from atto benchmark utility.

Thank you very much for the help.
Click to expand...

Well, here are the first suggestions. Make sure you are running the latest BIOS (11.6) and the latest RAID drivers (3.3.1540). You can get them at http://www.msi.com/product/mb/990FXA-GD80.html#/?div=Driver&os=All . One question, I checked the manual and it says the SATA ports numbers start at 1, not 0.
 
mwroobel said:
Well, here are the first suggestions. Make sure you are running the latest BIOS (11.6) and the latest RAID drivers (3.3.1540). You can get them at http://www.msi.com/product/mb/990FXA-GD80.html#/?div=Driver&os=All . One question, I checked the manual and it says the SATA ports numbers start at 1, not 0.
Click to expand...

That is weird, in the manual I have, it starts at 0, but the online manual starts at 1, so according to online manual it's 1 and 2 then. I did check the drivers already and they where up to date, and I just downloaded that live update program and my bios is up to date also.
 
2-loc said:
That is weird, in the manual I have, it starts at 0, but the online manual starts at 1, so according to online manual it's 1 and 2 then. I did check the drivers already and they where up to date, and I just downloaded that live update program and my bios is up to date also.
Click to expand...

If you run the test now, did the update make any difference?
 
One other thing. ATTO will give you average speeds for different sample sizes. Give HD tune a chance. It isn't the best SSD test app out there, but it will give you min/max and average speeds, and it will also give you a visual impression of the tests. You should see a fairly linear line from start to finish. If it gives you a sawtooth pattern (high peaks and low troughs) you might have something interfering with the writes, sometime antivirus software can skew the results. Here is a link - http://www.hdtune.com/
 
mwroobel said:
One other thing. ATTO will give you average speeds for different sample sizes. Give HD tune a chance. It isn't the best SSD test app out there, but it will give you min/max and average speeds, and it will also give you a visual impression of the tests. You should see a fairly linear line from start to finish. If it gives you a sawtooth pattern (high peaks and low troughs) you might have something interfering with the writes, sometime antivirus software can skew the results. Here is a link - http://www.hdtune.com/
Click to expand...

I have re-ran atto, and the benchmarks are the same. I also disabled my antivirus and it's the same.

I tried HDtune, and it seems that my read speed spikes alot, up and down from 182-270 MB/s with an average of 223MB/s which is what a single drive is.

Hmm, it seems to be able to benchmark the write of my RAID, I'll have to not use it as a boot drive, is there any way around this?
 
I also just ran AS SSD benchmark and it rates my read/write at 423/250 which is kinda more of what I expected. I don't know which bench marking tool to rely on.

I'll look into that mwroobel, I don't have an optical drive loaded into my computer at the moment though.
 
2-loc said:
I also just ran AS SSD benchmark and it rates my read/write at 423/250 which is kinda more of what I expected. I don't know which bench marking tool to rely on.

I'll look into that mwroobel, I don't have an optical drive loaded into my computer at the moment though.
Click to expand...

as-ssd uses random data and is more accurate for a real workload
 
Try doubling the size of the raid stripe size. If that works I will tell you why..
 
Yep, alignment and stripe size can play a role, considering how SSDs work.
 
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