VM migration from one ESXi host to another is causing a strange graph signature that is very reproducible:
I have no idea why this is happening. The ESXi server is a Dell PowerEdge 2850 using an Intel PRO/1000 MT for its vKernel port. The switch in question is a Dell PowerConnect 6248. The issue occurs on all of our 2850s. I have not made any changes to the more esoteric ESXi configuration options. The same file transfer between two 2950s running ESXi 5 on the same switch will result in a nice consistent graph that averages around 70MB/s.
Any insight or suggestions are greatly appreciated, even if the insight is "PE2850s are end-of-life and ill-suited for virtualization." Not averse to buying network hardware. Thanks!