When you want to upgrade XenServer, you should take the following steps. To perform an update, you must disable the VMs on the XenServer host that you want to upgrade. Before you upgrade the host, make sure that no VMs are running on it. To move them, you must follow the procedures for the pool master. You can find the installation media on the pool management page. You may find more details about this at https://www.contradodigital.com/2020/11/06/how-to-upgrade-xenserver-to-xcp-ng-server/
To upgrade your host, first make sure you have the latest version. After you have installed the new version, open the XenCenter application. Then, choose the XenCenter tool and run the setup wizard. You can also use the XenCenter to upgrade XenServer. If you are able to access the ftp server, you can use the XenCenter installer to perform the upgrade.
Before you start the upgrade, make sure all VMs are shut down or suspended. If you are upgrading a pool of VMs, you should make sure that the VMs have a CD/DVD drive that is not empty. This is because the VMs will not be attached to a physical CD. It will be possible to restart suspended VMs if you want to use them again.
After you have finished the installation, it is time to upgrade your guest tools. You can do this manually or automatically. Both methods have their advantages and disadvantages. The automatic option flags any missing hotfixes and pre-checks, but you should use the manual option if you want to save time. A manual upgrade will be more complicated, but it is the best way for some VMs. If you have a large number of guest machines, you can upgrade them all at once.
You can upgrade XenServer by either installing the update or running a script. To upgrade manually, you must install the update on each host. After you have installed the update, you must boot each host. If you don’t have internet access, you can only upgrade one host at a time. The installation process is similar to installing a VM manually. After the installation, you should reboot your host and rerun the procedure.
In the process of installing the new version, you can either use the CD or the network to install XenServer. In either case, you need to install the upgrade on a host that is the master. If you have an existing pool, you can use the CD to perform the upgrade. However, you must be careful to avoid losing data during the upgrade. If the installation process is interrupted for any reason, you must manually stop the upgrade.
It is also important to upgrade XenCenter. You need to make sure that your master server is upgraded before upgrading the other hosts. The upgrades will take place automatically. You can upgrade the master server and then upgrade the other hosts in the pool. While you need to update XenCenter, you can use the pool backup to revert the upgrade. The new version will supersede any previous versions. If you want to upgrade XenServer, you can use the xencenter-guidance to do so.