I´m gonna setup 3 ESXI hosts (free edition) with no vsphere for now.
a) If I purchase a Vsphere licence next year, can I just upgrade the 3 installed hosts without re-installing them?
b) Storage issue (ISCSI), I´ll be using an Emc Vnxe3100 storage for the 3 esxi´s, should I set a Host-only-Lun for each host? I don´t know if setting up a shared Lun for the 3 hosts would cause any data loss, cause there would be no central software to admin them as a cluster.