Weird issue with Sever 2102R2 2 node cluster. Has worked for several years but during patch Tuesday reboots 2nd node could not rejoin cluster. Cluster validation tool indicated it was a network error and Failover cluster manager shows same issue even though
all NICs are up and can be reached via Ping, etc. Network configuration has 4 network adapters. #1 is on 192.168.140.10(LAN) on VM01 and 192.168.140.40(LAN) on VM02. #2 on both is setup as VM_Main in Hyper-V so doesn't have an IP address just Hyper-V virtual
switch. #3 is on iSCSI network 192.168145.7(SAN) on VM01 and 192.168.145.11(SAN) on VM02. #4 is on iSCSI network 192.168.145.8(SAN) on VM01 and 192.168.145.12(SAN) on VM02. The SAN is connected to 2 - HP2530 switches with one adapter from each host and each
controller (2) on the equalogic on each switch. The Hyper-v vEthernet adapter is on 192.168.140.23 and shows enabled on VM01. On VM02 the adapter is set to automatically detect and disabled. I don't remember what the normal status of the vEthernet adapter
was on VM02 as I set it up a while ago and it has worked (I was thinking the owner of the vEthernet switch was the controlling node in the cluster so disabled was normal for the non-controlling node). All adapters have IPv6 set to auto except the iSCSI SAN
NICs where IPv6 is not installed. Cluster network 1 192.168.140.0 is set up for cluster communication.
On the cluster the cluster service on VM02 won't start and the network details in the cluster manager show that Cluster Network 1 - 192.168.140.40 (LAN) and Cluster Network 2 - 192.168.145.11 (SAN) are unreachable. Both networks are running fine on VM01 and all virtual machines are running on VM01. Again I can ping all interfaces and the binding order is the same on both nodes - LAN, VM_Switch, vEthernet Switch, SAN1, SAN2.
I have read quite a lot over the last few days and the indication is that the networks are not set up correctly but I am not sure how to change it. Again it has worked for quite a while and other than patches not sure what changed.
Sorry for such a long post but I know the more you know the easier it is to diagnose.
ewb