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We have two hosts running 2008 R2 and Hyper-V. iSCSI SAN using a Equallogic 6k and ps4000 pooled together. They are connected to two Dell 6224 switches. I have one VLAN for the iSCSI and then another VLAN for the failover network.

We have been upgrading fiber and switches on our campus and looped the network (found two media converters and both were plugged into the switch). All of my VM's rebooted. This is the error I received:

The Cluster service is shutting down because quorum was lost. This could be due to the loss of network connectivity between some or all nodes in the cluster, or a failover of the witness disk.

Run the Validate a Configuration wizard to check your network configuration. If the condition persists, check for hardware or software errors related to the network adapter. Also check for failures in any other network components to which the node is connected such as hubs, switches, or bridges.


Cluster node 'X-VH02' was removed from the active failover cluster membership. The Cluster service on this node may have stopped. This could also be due to the node having lost communication with other active nodes in the failover cluster. Run the Validate a Configuration wizard to check your network configuration. If the condition persists, check for hardware or software errors related to the network adapters on this node. Also check for failures in any other network components to which the node is connected such as hubs, switches, or bridges. ..

I am trying to figure out why the iSCSI would drop out. This is on a completely different switch than the LAN that had the network loop. Any ideas?

Once the VM's reboot some of the Volumes are in redirected access and I can not move them to the other node or they fail. I can reconnect the iSCSI target and then they will come back in a online status.

Can anyone make some since of this and why it happens when the iscsi is on a completely different network from the LAN side.

Power connects have 4 server iSCSI connections, 3 failover connections, and then 4 iSCSI connections from each SAN.

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What makes you think the iSCSI dropped out? It looks like the cluster nodes lost their ability to talk to each other over the LAN. –  David Schwartz May 4 '12 at 1:52
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