We have deployed ZFS for the last few years on some large backup servers (Solaris and FreeBSD) and our experience has been pretty rotten - the command line is s

We have deployed ZFS for the last few years on some large backup servers (Solaris and FreeBSD) and our experience has been pretty rotten - the command line is slow at managing a few hundred volumes, it becomes unusable during a rebuild, and it has / had a rotten bug where if you fill a volume up to 100%, you need to allocate more space before you can delete it. It's been a multi-year mistake for us and we're busy changing these servers back to nice simple XFS volumes.