Not quite sure I fully agree if you are saying iSCSI/FC target can ONLY be mounted to one ESXi host at a time, VMFS will make it a cluster/shared volume and be accessible simultaneously to all hosts in vSphere cluster then you can use vMotion/svMotion granted you make the target accessible via comstart stack to multiple hosts in the cluster. I also DO prefer to use NFS though. Just simpler and quite performant/near lockstep w/ iSCSI/FC long as you make it over 10G ethernet fabric or above.Unlike an NFS share that can be accessed simultaniously by multiple clients, a FC/iSCSI target is mouted from ESXi like a local disk what means that you must disconnect prior a connect from another ESXi.