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SLOW SSD Raid-0 on Highpoint 2720SGL

post #1 of 10
Thread Starter 
I just got a raid controller and the raid is very slow.

Chipset is a A75 (AMD Llanos), the controller is a 2720SGL, the drives are 3x 60gig Agility3. I'm getting sequential read rates of 560MB/s which is about as good as a single drive. Even changing the Bus speed from 100MHz to 115MHz made no change in read performance. Any ideas what could be causing this?

thanks
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post #2 of 10
What slot is the controller card in? What stripe size are you using? Did you manually align your partitions?
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post #3 of 10
That^

And what benchmark are you running?

If AS SSD it is about right, if ATTO then you have an issue.
post #4 of 10
Thread Starter 
Quote:
Originally Posted by Blameless View Post

What slot is the controller card in? What stripe size are you using? Did you manually align your partitions?

I only have 2, x16 express slots on my mobo, it's the further one. I'll get back to you on the stripe size. how do i align the partitions?
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air
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CPUMotherboardRAMHard Drive
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dBag
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post #5 of 10
Can you post a screenshot of AS SSD?
post #6 of 10
Thread Starter 
Quote:
Originally Posted by Sean Webster View Post

That^
And what benchmark are you running?
If AS SSD it is about right, if ATTO then you have an issue.

511
dBag
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air
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CPUMotherboardRAMHard Drive
xeon e3-1230v2 supermicro mbd x9scm-0 KVR1333D3E9S/4G OCZ vertex3 60GB 
CoolingOSPowerCase
1u 80mm blower + passive cpu  proxmox 3.1 supermicro 300w 1u supermicro 1u 
Other
2x intel pro1000 nics  
CPUMotherboardGraphicsRAM
A8-3870K @ 3.7GHz GIGABYTE A75M-UD2H Power Cooler 7870 Team Group Inc 
Hard DriveCoolingOSPower
3x OCZ Agility 3 60GB (RAID-0 on Rocket RAID 27... Corsair H-80 core win-7 Seagate 750 Gold 
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some lian-li case... M-Audio AV40s + 10" Sony ___? 
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dBag
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yep...
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air
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CPUMotherboardRAMHard Drive
xeon e3-1230v2 supermicro mbd x9scm-0 KVR1333D3E9S/4G OCZ vertex3 60GB 
CoolingOSPowerCase
1u 80mm blower + passive cpu  proxmox 3.1 supermicro 300w 1u supermicro 1u 
Other
2x intel pro1000 nics  
CPUMotherboardGraphicsRAM
A8-3870K @ 3.7GHz GIGABYTE A75M-UD2H Power Cooler 7870 Team Group Inc 
Hard DriveCoolingOSPower
3x OCZ Agility 3 60GB (RAID-0 on Rocket RAID 27... Corsair H-80 core win-7 Seagate 750 Gold 
CaseAudio
some lian-li case... M-Audio AV40s + 10" Sony ___? 
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post #7 of 10
Everything is fine. The agility 3 is just "slow" with compressed data.

Use ATTO to see faster speeds with uncompressed data.

http://www.techpowerup.com/downloads/1749/ATTO%20Disk%20Benchmark%20v2.46.html
post #8 of 10
Thread Starter 
Quote:
Originally Posted by Sean Webster View Post

Everything is fine. The agility 3 is just "slow" with compressed data.
Use ATTO to see faster speeds with uncompressed data.
http://www.techpowerup.com/downloads/1749/ATTO%20Disk%20Benchmark%20v2.46.html

most excellent! Now what's this about alignment?

615
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CPUMotherboardGraphicsRAM
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some lian-li case... M-Audio AV40s + 10" Sony ___? 
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dBag
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yep...
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air
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1u 80mm blower + passive cpu  proxmox 3.1 supermicro 300w 1u supermicro 1u 
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3x OCZ Agility 3 60GB (RAID-0 on Rocket RAID 27... Corsair H-80 core win-7 Seagate 750 Gold 
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some lian-li case... M-Audio AV40s + 10" Sony ___? 
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post #9 of 10
Alignment is @ a 1MB offset, which is fine, but:
Quote:
Originally Posted by Blameless View Post

If using an odd number of drives in an array or an older Windows OS (XP, server 2003, etc) you will probably want to use diskpar, diskpart (or a comparable utility) to manually align any partition you put on the array. You may well need to do this before starting the OS installation setup.

WIndows Vista/7/Server 2008(R2) will use a 1024KiB offset, which is fine for most uses, but this number is not cleanly divisible by odd numbers, so can result in less than optimal performance when odd numbers of disks are in the same array. In these cases, I recommend using the stripe size * number of disks (or, in the case of small stripe sizes whatever multiple of that it takes to make the offset at least 64k).
post #10 of 10
http://www.wwpi.com/index.php?option=com_content&view=article&catid=99:cover-story&id=8840:ssd-storage-demands-proper-partition-alignment&Itemid=2701018

https://wiki.archlinux.org/index.php/Solid_State_Drives - look at the "Tips for Maximizing SSD Performance" section.

Using RAID 0 adds another layer, the stripe size to these calculations. Taking this into account isn't going to be a huge deal, but you may see slightly better results by making the the offset at least erase block size, or stripe size (whichever is larger), times the number of drives in the array. With your array, I would do 3072k (3MiB) to be safe.

Edit: even better article - http://www.mysqlperformanceblog.com/2011/06/09/aligning-io-on-a-hard-disk-raid-the-theory/

Basically, you want to line up each and every layer of the I/O system optimally, and the default 1024k offset, while perfectly fine for single drives or powers of 2, is not ideal for non-power of two disk arrays.
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