[ovirt-users] edit gluster storage domain

Hello, I need to edit a glusterfs storage domain to add the mount option " backupvolfile-server=SERVER" So when the primary servers IP is not accessible the remaining servers will be used to retrieve data stored on the gluster volume. Right now when I try to edit the storage domain the mount options box is grayed out and not editable. I recently had to take all vms down so I put the HV in maintenance mode and the edit options wasn't present. I need to understand if this is the correct option to make a glusterfs volume fault tolerant? Also I need to understand how to make this edit in the ovirt web interface or other method. TIA