I remember when I worked in a company that was a netapp shop, and in 2007, they sent one of the ZFS developers and andy bechtolsheim to sell us thumper and ZFS. The developer and I had a spirited discussion of the relative merits of having volume management built into the filesystem.

At the time I advised my company to skip the storage servers (which were overdesigned IMHO, but were unquestionably stout hardware) but that ZFS was an interesting filesystem to explore.