Hi,
12 Node Cluster 2012 R2 Hyper-V Cluster
Blade servers across multiple blade enclosures
Each blade enclosure has 2 network switches (Dell IOA) connected to one core switch in a LACP LAG
2 core switches (Nexus 5Ks)
2 NIC teamed for Host Management, LM, CSV and Backup. Switch Independent/Dynamic
The problem is when we reboot one of the core switches it can cause hosts to shutdown the cluster service as it lost quorum. As a test the samesubnetthreshold was increased to 120 and the during the switch reboot no VMs appeared to HA, however I wasn't
involved in those tests so didn't witness them.
We reduced the threshold to 20 and rebooted the switch and 3 nodes in the cluster went to down. Looking in the event logs one of the nodes the cluster service was stopped within 5 seconds as it lost quorum due to the amount of nodes it reported it lost
connectivity to.
Any ideas as its not handling the threshold as I expected
Thanks
Jay