Citrix Xenserver is a beautiful open source (from 6.2 edition and later) hypervisor that tries to grab as much as possible market share on virtualization/cloud world. It carries many years of development efforts by Citrix, many well established implementations and a broad support community. XenMotion, High Availability and all the great features of Xenserver are available on the licensed and unlicensed versions of the hypervisor.
The licensed version includes automated patches and updates through XenCenter console and 24×7 Citrix Technical Support. On the unlicensed version, the administrator should apply the xenserver patches by himself through an ssh console. XenCenter still notifies the availability of new patches.
So, on XenCenter when you goto Tools – Install Updates, you get grayed out options. To manually apply the updates, first of all we should download the new patches from Citrix webserver, XenCenter will help you to do so. Then unzip the contents of