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1500 vs 1514

Posted on 2013-05-20
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Last Modified: 2013-08-06
I am trying to increase the speed over 1g network between my backup server and a Qnap nas connected with ISCSI.  What would be the best transfers speeds I should use?  My Qnap nas goes to 9000 on the Nic card.  When I set my network card to that, it locked up my system.  When I installed Server 2008 R2, it set the card speed to 1514 instead of 1500 like my other systems.  I'm confused.

Thanks with any response
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Question by:Gbob01
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by:smckeown777
ID: 39182666
Exactly what speed are you getting now?

Max theoretical speed on a gig link is 1000/8 = 125MB/sec

9000 setting on the NAS means its 'jumbo frames' enabled, but depending on the nic in your server it might not be able/compatible with jumbo frames

What hardware is in the server? Nic I mean? Make/model?
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by:smckeown777
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Another thing you need to check as well - your switches support Jumbo frames? Everything from the NAS to the server in the loop needs to be 'jumbo aware' in order for this to work...just another thing to be aware of...
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by:Gbob01
ID: 39184244
Thanks for your response.

I am not sure what speed I am getting.  I am using ISCSI that goes directly from my server to my nas, no switch involved.  The server is a HP Prolient DL360 G4p.  The network cards say Broadcom NetExteme Gigabit Ethernet.  The Nas is a Qnap TS 439 Pro II+ with 8TB, Raid 10.  
How does one detect the speed and then set the optimum speed, not only for a direct connection like this but for the entire network.  I recently upgraded all our computer to Dell Optiplex 7010 running Win 7, bought two Dell 1G switches, and rewired our building with Cat 6.  The system is faster but not what I expected.  I don't think jumbo frames are enabled on the switches by default.

Gary
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smckeown777 earned 500 total points
ID: 39184332
At end of the day you need to know what speed you are getting, otherwise you are possibly looking at the wrong part of your setup...I assume you upgraded all switches to 1GB from 100MB? In those cases you should have seen SOME improvement...but again you'll really only see improvements if you are transferring a lot of data over the network in general

'The system is faster but not what expected' - which part is 'not as expected'? Again what is slow exactly?

See this post for things to look for - http://www.codinghorror.com/blog/2009/03/the-promise-and-peril-of-jumbo-frames.html

Basically the Broadcom nics might not have Jumbo support - might need an updated driver to fix that(check that link to see where to look for Jumbo settings on nic)
Not all nics have the support, but usually once a driver update is installed you'll see it...

As for 'detecting speed' that's simply a file transfer at the simplest level - copy large file from server to NAS and you'll see the MB/s speed...that's a starting point at least
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