There are two methods to add external Storage in HCI.
Method-1

1. Add a new VLAN "100" (External-SAN) in TOR switches.
2. Assign same VLAN IP address to Third party SAN Controller.
3. Allow new created VLAN on all trunk ports connecting to Nodes.
4. Create a Port group in HCI Network portion and connect to Physical Edge.
5. Create a Virtual Switch and allow VLAN 100.
6. Now Connect the new virtual switch with VM where you want to mount volume.
7. Add a new NIC in VM and assign VLAN 100 IP to VM.
8. Now you can add iscsi volume in the VM.

There are two methods to add external Storage in HCI.
Method-1

1. Add a new VLAN "100" (External-SAN) in TOR switches.
2. Assign same VLAN IP address to Third party SAN Controller.
3. Allow new created VLAN on all trunk ports connecting to Nodes.
4. Create a Port group in HCI Network portion and connect to Physical Edge.
5. Create a Virtual Switch and allow VLAN 100.
6. Now Connect the new virtual switch with VM where you want to mount volume.
7. Add a new NIC in VM and assign VLAN 100 IP to VM.
8. Now you can add iscsi volume in the VM.