Updates for XenServer are supplied as files with the file extension .xsupdate (or .xsoem for embedded servers running older versions of XenServer). You must always update all of the servers in a pool at the same time; running a mixed pool of updated and non-updated servers for general operation is NOT supported as communications between the servers in the pool may be interrupted or may not work as expected.
You can use one of the following methods to install an update to your managed server:
The Install Update wizard allows you to apply the same update to multiple servers at the same time. Ensure that you have downloaded the required update before you open the Install Update wizard. Follow the instructions below to download the update.
Download available updates:
After downloading software updates (or "patches") for XenServer, you can install them on your managed servers using the Install Update wizard.
To open the Install Update wizard: from the XenCenter menu, select Tools and then Install Update. Follow the on-screen instructions to apply updates to your managed server.