When you want to upgrade a XenServer pool, there are a couple of things to keep in mind.
- If you want to add a new server to the pool, it is not possible to install a newer version of XenServer on that new server. Because once installed, it will not be able to join your existing pool. You have to install the version that is used on the other virtual hosts in the pool.
- When you want to upgrade your XenServer pool to a new version, you have to start with the pool master. If you don’t start with the pool master, your upgraded server will not be able to communicate with the rest of the pool.
- When you want to upgrade to XenServer 5.6.1-fp1 and you have a Realtek ethernet card, you’ll have to do something extra. After the upgrade, your server will not be accessible over the network. The simple solution is to add
options r8169 use_dac=1to the file “/etc/modprobe.conf”.