We have a couple of simple two node Hyper-V clusters. They are fresh installs with 2012R2 (running on Cisco UCS blades).
They are configured with dedicated NIC for Management, 2x dedicated NICs for storage (using MPIO and NetApp DSM) and then a trunk for VM traffic with virtual adapters for CSV, Live Migration and Heartbeat. Binding orders all set and priorities.
With storage, we have a 1GB Quorum disk and then a temporary 500GB CSV.
All is healthy and happy, I can move VMs around, move the CSV around, fail hosts etc and all works fine.
HOWEVER..... If I disable BOTH of the iSCSI NICs on one of the host (the host that currently owns the CSV), then all hell breaks out. I would have expected that the CSV would go into redirected mode and use the connection from the other node? The CSV disappears from FCM temporarily, then comes back and goes red (Offline). It doesn't even try to failover to the other node. If I manually move it over to the other node then the CSV comes straight back online.
Watching in Disk Manager on both nodes I can see on the effected host that the volumes do not disappear once it looses the iSCSI connection. I'm pretty sure that with the iSCSI disconnected (iscsicpl showing "reconnecting" state) that those disks should disappear? But perhaps that is my problem here.
Is the expected behavior or does it sound wrong? If so, any ideas?
Also - I've noticed that in FCM, my cluster networks all go to a state of showing a red question mark over them with the exception of the management NIC. It feels like the cluster is having a fit and failing to communicate properly once I disable the iSCSI NICs.
Any input greatly appreciated!