I use Ceph/CephFS myself for my own 671TiB array (382TiB raw used, 252TiB-ish data stored) -- I find it a much more robust and better architected solution than Gluster. It supports distributed block devices (RBD), filesystems (CephFS), and object storage (RGW). NFS is pretty solid though for basic remote mounting filesystems.

My home rack draws around 3.5kW steady-state, but it also has more than 200 spinning disks