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VERY slow RAID5 on ICH10R with 3x WDC Green drives

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July 4, 2011 7:30:49 PM

Hi,

I'm having really slow write speeds when copying files.
It starts at ~120mb/s and goes down to ~5mb/s

I'm running windows 7 ultimate x64 with latest intel rapid storage driver v10.1.0.1008
Here's my rig
Gigabyte P55-UD3R
Intel core i7 860
4x2gb gskill's ripjaws ddr3 1600mhz cl7
1x 60gb OCZ Vertex 2 for OS
3x WD20EARS version 00MVWB0 with firmware 51.0AB51 (poor raid5)
3x WD10EADS version 00M2B0 with firmware 01.00A01 (poor raid5)

Is there something i forgot?
How can i test my stuff more further?
are there any optimisations i could try?

Also, i have read a little about TLER not being present on WD green series. Would that affect performance as much as that?
Maybe i should return some and use another brand or model? Any recommendation?

Thx alot
a c 277 G Storage
July 4, 2011 10:19:18 PM

While I can't aaddress your particular details,
1) RAID5 arrays with only three drive are slow
2) RAID arrays with Green drives are slow, because the green drives are slow

Have you ever had a successful implementation like this that you can compare it with?
July 4, 2011 10:54:32 PM

Hi,

I had 3x 250gb seagate barracuda 7200.10 drives before in raid5
Related resources
July 5, 2011 3:04:43 AM

If you want to run RAID on Western Digital harddrives, I recommend the Caviar Black drives as opposed to the Green drives.
July 5, 2011 3:58:50 AM

sykozis said:
If you want to run RAID on Western Digital harddrives, I recommend the Caviar Black drives as opposed to the Green drives.


does it have tler?
July 5, 2011 4:28:36 PM

From the information I have, TLER is a feature of Western Digital's enterprise drives.
a b G Storage
July 8, 2011 3:30:20 AM

I would expect 3 WD Greens in RAID 5 to be slow. There is a big difference between 5400 and 7200 RPM drives, everything else being equal. In addition to that, writes on RAID 5 are painful, you'd probably be better off with a single drive if this is your system drive.
a c 277 G Storage
July 8, 2011 12:44:13 PM

Tokencode
I obviously agree with you. But what stumps me entirely is that it slows down during copying. We both know why such a setup is inherently slow, but can you suggest a reason that performance would drop so greatly during a single session? Unless the drives are powering down, which would be silly. Or are the parity calculations being done on the CPU, and some other process is competing for cycles?
September 28, 2011 2:49:43 PM

Have you been able to do anything to speed-up your writes?
I have just created a similar set-up with WD Green 2TB drives and Intel RAID on my Asus mo-bo. Write speeds are killing me!
October 3, 2011 11:40:52 PM

WyomingKnott said:
Tokencode
I obviously agree with you. But what stumps me entirely is that it slows down during copying. We both know why such a setup is inherently slow, but can you suggest a reason that performance would drop so greatly during a single session? Unless the drives are powering down, which would be silly. Or are the parity calculations being done on the CPU, and some other process is competing for cycles?

If you're using ICH10R for raid, everything is done by the CPU as it's more or less a software based raid. Your only real options for speeding things up would be faster harddrives or a hardware raid controller (like the areca ARC-1210: http://www.newegg.com/Product/Product.aspx?Item=N82E168...) that includes a dedicated RISC processor to handle all raid functionality independently of the CPU.
May 14, 2012 7:25:25 AM

benzebut said:
Hi,

I'm having really slow write speeds when copying files.
It starts at ~120mb/s and goes down to ~5mb/s

I'm running windows 7 ultimate x64 with latest intel rapid storage driver v10.1.0.1008
Here's my rig
Gigabyte P55-UD3R
Intel core i7 860
4x2gb gskill's ripjaws ddr3 1600mhz cl7
1x 60gb OCZ Vertex 2 for OS
3x WD20EARS version 00MVWB0 with firmware 51.0AB51 (poor raid5)
3x WD10EADS version 00M2B0 with firmware 01.00A01 (poor raid5)

Is there something i forgot?
How can i test my stuff more further?
are there any optimisations i could try?

Also, i have read a little about TLER not being present on WD green series. Would that affect performance as much as that?
Maybe i should return some and use another brand or model? Any recommendation?

Thx alot

May 14, 2012 7:28:25 AM

benzebut said:
Hi,

I'm having really slow write speeds when copying files.
It starts at ~120mb/s and goes down to ~5mb/s

I'm running windows 7 ultimate x64 with latest intel rapid storage driver v10.1.0.1008
Here's my rig
Gigabyte P55-UD3R
Intel core i7 860
4x2gb gskill's ripjaws ddr3 1600mhz cl7
1x 60gb OCZ Vertex 2 for OS
3x WD20EARS version 00MVWB0 with firmware 51.0AB51 (poor raid5)
3x WD10EADS version 00M2B0 with firmware 01.00A01 (poor raid5)

Is there something i forgot?
How can i test my stuff more further?
are there any optimisations i could try?

Also, i have read a little about TLER not being present on WD green series. Would that affect performance as much as that?
Maybe i should return some and use another brand or model? Any recommendation?

Thx alot




Hi

Do you have still this drive(WD10EADS version 00M2B0 with firmware 01.00A01) with you, If you can sale this wd drive.
March 1, 2013 5:06:57 AM

WD Green drives are slow. the reason you are having a performance issue is basically this. You start the transfer. 130MB/s is normal on GBit network. Its all being dumbed to ram to make up for drives slowness... as soon as ram runs out the system slows the transfer to let the drives catch up... I am currently using a LSI card with 4 2TB drives in a 10E array. Striping and mirroring. This actually works well and you do not loose performance. However you lose space... but fully redundant.
a b G Storage
March 1, 2013 8:53:35 PM

Software RAID speed always hit and miss.

Just use the hardware raid i'm using you will have about 180MB/sec+
http://www.amazon.com/multiplier-hardware-RAID0-CLONE-C...

Once you use it - you will never look back at SW raid

with SW raid another pain that nobody is mention - Rebuild it takes days

BTW TLER just make your drive drop off from RAID. it has every little to do with speed
July 25, 2013 9:30:03 AM

Write speed will drop sharply after the drive cache gets consumed during a large write.
!