Only 2x 10GbE isn't the best setup, so I would prefere:

2x 10 GbE: NFS

2x 1 GbE "Frontend" (VMs)
2x 1 GbE vMotion

If you need 10 GbE for VMs, then maybe this mix setup:

1x 10 GbE (active), 1x 1 GbE (passiv): NFS
1x 10 GbE (active), 1x 1 GbE (passiv): "Frontend"

2x 1 GbE (active) vMotion

And if you have big VMs (mostly huge RAM), then I would combine vMotion and Frontend on one vSwitch.

In every solution, I would seperate each type by network and VLAN, so you have 3 portgroups:

* Network 1, VLAN 1: NFS

* VLAN 2: VMs

* Network 2, VLAN 3: vMotion

Best regards,

Alex