Hi all
I'm having an very strange problem, and was hoping some of you may give me some great ideas to figure out whats going on.
The senario.
My customer has an Dell VRTX with two PowerEdge M520 servers in it.
Both servers are running Windows Server 2012 R2 with HyperV and Cluster.
In total they have 9 VM to handle, and they are doing this very good.
But.....
At some point, for no good reason, on of the host are losing access to the Local network, and because of this, I can't access the server.
Sometimes the host with no LAN access are still having all the VM on it, and these can very well access the LAN, and all of the network, like nothing was happend. But the host is gone.
If I perform an reboot of the host, with the VM, then it comes back online, an can start migration of the other host if needed.
I have just had the above situation (again), but this time the host with no LAN access hold all of the VM, and I couldn't power off the VM in production time.
In the event viewer I saw this:
Event ID: 16945 - MsLbfoSysEvtProvider
MAC Conflict: A port on the virtual switch has the same MAC as one of the underlying team members on Team Nic Microsoft Network Adapter Multiplexor Driver
It's the first time I have seen this error, so I have looked through all of the MAC addresses on the server.
The VM MAC Output:
| VMName | MacAddress |
| ------------------------ | ----------------------------- |
| XXXX-CLPA-A | 00155D017022 |
| XXXX-CLPA-A | 00155D017023 |
| XXXXGT-WDS-TEST-CLIENT | 00155D018117 |
| XXXX-HQDC-A | 00155D017004 |
| XXXX-HQPRON-A | 00155D018103 |
| XXXX-HQPS-A | 00155D017005 |
| XXXX-HQSCALA | 00155D017003 |
| XXXX-WDS-A | 0015AB019F03 |
| XXXX-WDS-B | 00155D017020 |
| XXXX-MGMT | 00155D018102 |
| WDS-CLIENT | 00155D017021 |
As showen here, theres no identical MAC addresses on the VM, so I compared against the Host.
| Connection Name | Physical Address |
| =============== | =============== |
| NIC3 | 18-FB-7B-1B-25-10 |
| NIC2 | 18-FB-7B-1B-25-0F |
| NIC4 | 18-FB-7B-1B-25-11 |
| NIC1 | 18-FB-7B-1B-25-0E |
| LAN TEAM | 18-FB-7B-1B-25-0E |
| vEthernet (LAN | 18-FB-7B-1B-25-0E |
Here I got the same MAC address on 3 interfaces, where two of them are not physical.
In an attemt to fix my problem right now, I have disabled the NIC1 on the host, as this has the MAC addresses there are also used on LAn Team and vEthernet.
And this seems to have help me out for now, because then the host came back to the LAN, and it is possible to find it again on the Cluster Manager.
My question is now, if anyone can tell me whats going on, and why have this happend?
It's not an solution for me, to have the NIC1 disabled, but as an temporary workaround is good at the moment.
Any good ideas?
Thanks
//Rosenstand