[ovirt-users] Upgrading

Is there a best practice when upgrading from ovirt 3.4 to 3.5? I upgraded my development server which is a self hosted server and I just did a regular update without putting anything under maintenance... Though my vm's where turned off. It all went well and the migration from krb/ldap to AAA went smoothly and so far is running like a champ. I am about to do the same to our production cluster and was wondering if I must put all Hosts under maintenance before I do the upgrade? Is it any different than a self hosted ovirt setup? Thanks in advance for all/any tips from the mailing list!