On unraid it was a bit of a hack to get tvheadend to run on it. Also unraid uses riserfs (or did at the time) so you would need a copy of Ubuntu 12.04 if you wanted to read the disks. Where as my raid 5 install could be moved to my ubuntu machine if needed and it would just work. A filesystem like BTRFS (or, presumably, ZFS) can work out the details automatically if you set it up in RAID-1 mode. But having one side of the mirror spread across 9 drives makes failure laughably likely, to the point where you're paying performance penalties for nothing.
Copy-on-write (COW), sometimes referred to as implicit sharing or shadowing, is a resource-management technique used in computer programming to efficiently implement a "duplicate" or "copy" operation on modifiable resources. I'd go with UnRAID long before ZFS, especially now considering UnRAID supports btrfs and xfs. It also supports Docker, which is pretty cool, too. N. NeverDie
What element has 3 valence electrons and 4 energy levels
Much of what we know about ancient greece and rome is due to the flocabulary
Selectively permeable organelle
Ckgs miscellaneous services