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Slow Esata and USB 3 speeds

Last response: in Storage
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August 19, 2012 1:28:30 AM

Ok. I am completely stuck here. I have two external raid arrays. Both are arranged in a Raid 5 and have 4 Seagate Barracuda 3TB drives in each. I have zero'd out the drives and checked them for errors using Seatools, so I know all the drives seem to be functioning well. When I run a benchmark on each of the Raid 5 arrays I see an average speed of 180MB/s over esata. Also, when I transfer a large file from the raid 5 to the SSD inside my laptop I see a stabilized speed of 140MB/s. However, when I transfer from 1 Raid 5 to the other Raid 5 it stabilizes at 30MB/s.

I have tried the transfer with both drives connected to USB 3, both connected to esata, and one connected to USB 3 with the other on esata. It always stabilizes at 30MB/s. Have updated all my drivers and still nothing. Please help me understand what is going on?? I have 5TB of data to transfer and this is going to take forever!

More about : slow esata usb speeds

a c 76 G Storage
August 22, 2012 8:15:49 PM

what is the model of your raid5 box?
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August 29, 2012 4:26:01 AM

SANS DIGITAL TR4UTBPN
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a c 76 G Storage
August 29, 2012 6:07:45 PM

Hmm this box should do about 200MB/s.

I hope your Seagate HDD is not a new series STxxxxDM001.

The last time we used 2TB STXXXDM001 in RM5_R5 a five bay 1U rack mount hardware raid. The results is very funky in write
It is very fast at first, but then it slows down to a craw.

I tried all to force the HDD ran as 1.5/3.0... It does not help.
But the I switch the HDD to Hitachi we got 245MB/sec

Go Figure!
I think it's the HDD, try other brand of HDD and see your result is same as mine
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September 2, 2012 4:16:56 PM

Well that resolved it. I was using the Seagate St3000DM001 series drives and they are not supported in Raid 5. I thought for sure they were. So, I swapped to Raid 10 and now have over 300MB/s speeds. Thanks Firewire2!
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September 2, 2012 4:17:18 PM

Best answer selected by mediabrewer.
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a c 76 G Storage
September 4, 2012 6:35:31 PM

Thank you!

That confirm my expected cause is not crazy!
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!