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тАО03-11-2008 10:01 AM
тАО03-11-2008 10:01 AM
Performance of Virtual Connect Ethernet w/LACP
If I pump data to a blade, it tops at 1Gb/s, everything is good since that's the maximum its NIC can take. But if I start pumping to another blade, then another one and so on, the throughput on all of them go down, always keeping a total sum of 1Gb/s. It's as if the LACP trunk is not able to go over 1Gb/s.
The Cisco admin swears he did everything suggested in the VC docs. And yes, I'm using multiple servers as data source, so it's not a bottleneck on the source side.
Any clues or suggestions before I open a call?
Points will be awarded, thanks.
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тАО03-11-2008 10:06 AM
тАО03-11-2008 10:06 AM
Re: Performance of Virtual Connect Ethernet w/LACP
http://h41267.www4.hp.com/eventpage.aspx?&eventid=NgA4ADkA&cc=ukтМй=en
http://h20000.www2.hp.com/bc/docs/support/SupportManual/c00814156/c00814156.pdf
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тАО03-11-2008 10:11 AM
тАО03-11-2008 10:11 AM
Re: Performance of Virtual Connect Ethernet w/LACP
Thanks
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тАО03-12-2008 02:17 PM
тАО03-12-2008 02:17 PM
Re: Performance of Virtual Connect Ethernet w/LACP
http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01386629/c01386629.pdf
starting on page 14 about VC Uplink Load Balancing.
if both VC links show active then you are properly forming an LACP channel. It just might be that the Load Balancing Algorithm in use is limiting the traffic to one link. This should be rare given the way VC load balances but it is not outside the realm of possibility.
Hope this helps...
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тАО03-13-2008 06:08 AM
тАО03-13-2008 06:08 AM
Re: Performance of Virtual Connect Ethernet w/LACP
Me and the Cisco admin are still looking into this. We've tried different scenarios, and the bottleneck is definitely either in the VC itself or the LACP trunk.
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тАО03-13-2008 06:43 AM
тАО03-13-2008 06:43 AM
Re: Performance of Virtual Connect Ethernet w/LACP
so if you go to Hardware Overview and into the detailed port statistics screen do you see traffic on both ports that are in the LACP channel? Do both ports have the same LAG ID?
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тАО03-13-2008 06:45 AM
тАО03-13-2008 06:45 AM
Re: Performance of Virtual Connect Ethernet w/LACP
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тАО03-13-2008 11:14 AM
тАО03-13-2008 11:14 AM
Re: Performance of Virtual Connect Ethernet w/LACP
Quote:
I suspect what you are seeing is inherent in the hardware design of the module.
Certain Cisco switch modules use ASIC's that are shared by multiple ports. This particular module uses 6 ASIC's of 8 ports each. They are designed for burst traffic and oversubscribe the bandwidth 8:1.
Each 8 port group has a bandwidth of 1GB.
What you are seeing is exactly what should be expected with the 2 LACP ports. Ports 5/25 and 5/26 are in the same port group.
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тАО03-13-2008 11:14 AM
тАО03-13-2008 11:14 AM