I have a client that is experiencing issues with the Nexus 5000 switches and vPC configuration. They have a pair of Dell servers each with dual port Emulex CNA's installed. When the server(s) are single homed to one Nexus 5000, using bandwidth throughput testing tools they see a sustained averaged throughput between the two servers of around the 9-9.5Gbps mark. However, when they connect the server to both Nexus 5000's in a vPC configuration, the server throughput seems to drop down to around the 6-6.5Gbps mark. The next odd thing is if one of the ports participating in the vPC is shutdown (or the interface is disconnected), the throughput almost immediately ramps up to the 9-9.5Gbps mark. Then if the port/interface is re-established, the throughput drops back down to 6-6.5Gbps.
The Emulex software was used to create a static (no LACP) network team with Destination IP load balancing, although for the throughput tests only a connection between 2 servers was used so the traffic should be sent to/from the same interface for every packet.
The relavant parts of the Nexus 5000's configurations is below:
interface mgmt0 ip address 192.168.77.6/25 cfs ipv4 distribute cfs eth distribute
Server #1 is connected to Ports 27 on both Nexus 5000's, and Server #2 is connected to Port's 28 on both Nexus 5000's. We have not, as yet, tested this all using LACP for negotiation of the virtual Port-Channels.
Can anyone suggest any ideas on what may be wrong or what we should look at? Is the vPC configuration all correct?
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