Right now JBOD, but will have a Raid 1 set up in the future.
I would expect to be able to see by volume, at least.
The dashboard seems to be designed with the assumption that you have only one volume.
The single biggest number is the total capacity left, which is a meaningless number if you have more than one volume.
Clicking to expant shows you usage by file type, which while cute is really meaningless as it does not seem to sort all file types correctly (and volumes are likely to be mixed files types anyway.)
I have an EX4 set up as a RAID 1 and I need to know how much space I have on each of my volumes, so I can plan for more storage before one of them fills up and causes problems