[ovirt-users] How to upgrade node from 3.5 to 3.6

Hi all! I've spent more than 2 days googling how to upgrade an ovirt node. Please, I need some serious help on this. The only thing I've found is that u can go to Hosts tab in the engine GUI > select the blade an there is an option for Upgrade between Reinstall and Configure Local Storage. Well, that option is grayed-out. There is no documentation available for it... I've dried the google sea and even a node-level command give this error: [root@blade1c2 admin]# ovirt-node-upgrade --reboot=1 --iso= http://resources.ovirt.org/pub/ovirt-3.6/iso/ovirt-node-ng-installer/ovir... ovirt-node-upgrade.UpgradeTool: INFO Temporary Directory is: /data/tmpgv4fHj ovirt-node-upgrade.LockFile: INFO Acquiring Lock Traceback (most recent call last): File "/sbin/ovirt-node-upgrade", line 382, in <module> u.run() File "/sbin/ovirt-node-upgrade", line 360, in run self._options.iso_file) RuntimeError: http://resources.ovirt.org/pub/ovirt-3.6/iso/ovirt-node-ng-installer/ovir... Please, need somebody to help me. Why upgrading a node it's so dificult in ovirt?