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connect 2 switches using 2 ports for more bandwidth? / trunking?

Posted on 2011-09-13
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Last Modified: 2012-05-12
Hello everyone,

I wanted to ask before i go off and spend $300-$500 on cables if it is possible for me to connect 2 x Dell 2824's and 2 x 2848's using 2 x 1G ports and almost.. LAG / bond them together to get more throughput instead of having to use the SFP ports ?

I have gone allover the GUI in managed mode and read alot and it seems like i mostly likely cant but i did wish to check first.

Also if i do use the SFP ports, are all SFP cables made equal?

On Dell's site all i can find are

http://accessories.us.dell.com/sna/productdetail.aspx?c=us&l=en&cs=04&sku=330-3965&baynote_bnrank=0&baynote_irrank=0&~ck=baynoteSearch

http://accessories.us.dell.com/sna/productdetail.aspx?c=us&l=en&s=biz&cs=555&sku=330-3966&baynote_bnrank=0&baynote_irrank=8&~ck=dellSearch

Search:
http://search.dell.com/results.aspx?s=biz&c=us&l=en&cs=555&k=SFP%2B&cat=all
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Question by:Mathiau
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Expert Comment

by:davorin
ID: 36530957
Before buying twinax cables I would double check if the switches even supports them.

I could find only this supported Optional Peripheral Products
Dell SFP Transceivers (1000-SX and 1000-LX for PowerConnect 2824 and 2848)
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Expert Comment

by:davorin
ID: 36530980
Sorry for posting in multiple comments.
It seems that this switch supports link aggregation. From specs http://www.dell.com/us/enterprise/p/powerconnect-2824/pd.aspx:
"Supports 4 link aggregation groups and up to 4 ports per group"
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davorin earned 250 total points
ID: 36531165
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Author Comment

by:Mathiau
ID: 36531395
reading the links now!

i didn't realize until someone else pointed out the SFP ports are only 1G links so i would get no advantage over using them.
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Author Comment

by:Mathiau
ID: 36533230
yup, looks like LAG is the way to go,  thank you sir!
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by:Mathiau
ID: 36533231
great detail.
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Author Comment

by:Mathiau
ID: 36533584
So i configured LAG on 2 servers and a switch

i show 2Gbps connection in the task manager / networking

i have 2 raid arrays on each server, one is a xeon 1320 the other a Xeon 5320 and both using intel team NIC', they both have arrays that are pushing 400Mb/s on benchs.

now i copy a single 30G file to and from them to test speeds but i can only ever get %50 of the 2Gbps usage...

is this normal?

about 100-115Mbps
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Expert Comment

by:davorin
ID: 36538728
You probably meant 100-115MB/s.
Please take a look at this articles. It is explaining what you can expect from ethernet connection.
http://www.dssnetworks.com/v3/FAQs.asp
http://www.tomshardware.com/reviews/gigabit-ethernet-bandwidth,2321-4.html

Network packets contains only about 70% of data that needs to be transfered.

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Expert Comment

by:davorin
ID: 36538750
You can get some gain also with enabling jumbo packets setting the MTU size to 9000.
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