I am preparing to upgrade our Moodle from 2.2.2+ to 2.5. I'm taking advantage to this oppurtunity to also move our Moodle from Red Hat Enterprise 5 to Redhat Enterprise 6. Our Moodle dataroot is simply an NFS mount from a separate file server. I'm going to simply dump/copy our mysql database to the new server and run the upgrade on there (leaving the older original Moodle install in tact should things fail).... My thoughts are to simply mount that same NFS mount to the new server (unmounting it from the older Moodle first). Obviously I'd shut down the original server so no one can use it, but I plan to keep it in tact should the upgrade fail. So my question is:
During a Moodle upgrade (from 2.2.2 to 2.5) are changes made to the dataroot directory/files? We will be doing full backups, but was just wondering if the upgrade were to fail if I could simply turn my older Moodle instance (left in tact) back on pointing back to the same NFS mount.