My configuration is: IBM X3850M2 with 4 Six Core CPU, 128 Gb RAM, 3x dual port network Intel Corporation 82571EB Gigabit Ethernet Controller
For testing I created only 2 VM (Server 2008) which are both using the same vSwitch ( witk vmnic1 and vmnic2). Both phyisical networks are connected to 1Gb/s switch.
If I copy large file (database backup file aprox. 4GB) from one phyisical server (also connected via 1Gb/s switch) to one VM Server 2008 I get maximum transfer speed about 20 MB/s.
When I copy large file (database backup file aprox. 4GB) between both Server 2008 (trafic should go only between internal vSwitch) I get maximum transfer speed about 33 MB/s.
Both servers are using new VMXNET3 driver (10Gb/s) and the speed are the same if I use VMXNET2 driver. Network utilization within Server 2008 with VMXNET2 driver is only betwen 20% and the CPU utilizaton is always 100% when I do some kind of copying.
Do not get me wrong, but I expected much more network thruput.
Do you get similar transfer rates or is it something wrong with my implementation?
Thank you for any kind of help
Best Answer
Something is wrong here, have you checked if your MAC addresses of the adapters are unique?