Comment by mahrens

ZFS on Linux large scale deployments: 55 Petabytes at LLNL

http://www.slideshare.net/MatthewAhrens/open-zfs-linuxcon

See slide 3; last slide has a little more detail.

ZFS on illumos: Nexenta claims 1.5 Exabytes under management (across multiple deployments)

http://billroth.ulitzer.com/node/2461630