The ESXi booting troubleshooting topics provide solutions to problems that you might encounter during the ESXi booting. Host Stops Unexpectedly at Bootup When Sharing a Boot Disk with Another HostWhen more than one host, either physical or virtual, boots from the same shared physical disk or LUN, they cannot use the same scratch partition. Host Fails to Boot After You Install ESXi in UEFI ModeWhen you install ESXi on a host machine in UEFI mode, the machine might fail to boot.