NSM2120 how to setup for 2 Citrix Hosts

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I have seen many descriptions of two hosts with four VMs, each host connected to the SAN, and I guess the SAN holds the VM images. That is where the VM boots from. So my question is this possible, to have one LUN and two hosts reference it for the option of XenMotion.?

I currently have non VM servers with iSCSI connected to the SAN luns, each using it as an external hard drive for nightly backups.

I woul like to know how to make the LUN so both XenServers can work off this setup for HA.