Here we assume that you have already created VM’s device to link to desired ISO image you wish to boot from. The objective is to instruct XenServer’s host virtual machine to boot from ISO CD/DVD image instead of default VDI disk. Failure to do so may result in following error message:
This is a companion discussion topic for the original entry at https://linuxconfig.org/how-to-instruct-xenserver-s-host-virtual-machine-to-boot-from-iso-cd-dvd-image/