We recently installed and configured new Overland S5000 SANs for our virtual environment. In doing so we noticed tons of errors once we added the SAN IPs to our iSCSI Software Adapter. The vmkernel.log was saying that the SANs were offline and then online and then offline and then online constantly.
The issue turned out to be that our new SAN doesn't support Multisessions. It doesn't like seeing the same subnet connecting to the SAN network cards and controllers.
What we ended up doing was putting each NIC on the two controllers in their own VLAN:
Controller 0, NIC 0 - VLAN 2
Controller 0, NIC 1 - VLAN 3
Controller 1, NIC 0 - VLAN 4
Controller 2, NIC 1 - VLAN 5
With this setup you will need 4 NICS on each host, one for each VLAN to ensure redundancy and multipathing. Each ESXi NIC would go to one VLAN.
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