[ovirt-users] Crate brick button gray out.

Hi guys, brand new with ovirt. I'm trying to use it to manage my gluster set-up. For testing purpose I've installed 3 Centos 7 machines, one for the engine and the other two as glusterfs nodes. All machines are using the 3.6 repo version. Both nodes have an extra hard disk to be used by gluster. Everything went smotth, I activated and installed the nodes and I have no errors in engine.log or in deploy logs. My understanding was that I can create bricks and use them to create volumes in ovirt. The extra hard disks I have for nodes are formated as xfs and mounted. I can see them in the engine admin interface but the "create brick" button is grayed out. Thanks.