According to aspects of the present disclosure, a method of operating a virtual storage area network cluster including a plurality of hosts is provided, each host of the plurality of hosts executing at least one Virtual Machine (VM) and being configured to receive power from a respective Uninterruptible Power Supply (UPS) of a plurality of UPSs, the method comprising acts of determining a number of critical UPSs of the plurality of UPSs, each critical UPS of the plurality of UPSs corresponding to a critical host of the plurality of hosts, determining that the number of critical UPSs does not exceed a fault tolerance level, and migrating VMs hosted by the critical hosts to non-critical hosts of the plurality of hosts.