Dear Listmember,

I've just upgrade to my ovirt-hosted-engine from 4.1 to 4.2.3. It was successful, but it saw "Data Center XYZ compatibility version is 4.1, which is lower than latest engine version 4.2. Please upgrade your Data Center to latest version to successfully finish upgrade of your setup."

My first question is that, it need to do BEFORE or AFTER the node upgrades?