Hi Zach,
Thanks for your response. At the moment the ports are configured as access ports with only access to the specific VLAN they need.
In the scenario you describe, they would have to be trunk to allow standby adapter utilisation on both vSwitches.
I'll have a play and configure 2x new switches as you describe and change the ports to trunk.
Would you recommend using a DVS or standard vSwitch?
Thanks again