I decided to try BTRFS on my NAS because it didn&#x27;t require rebuilding a kernel.  The ability to add disks to an array and have it rebalance made it very appealing.<p>Unfortunately, the three-drive filesystem lasted two weeks before it became unmountable.  The only thing that let me mount it was finally running btrfsck.  I was left with 57 unrecoverable errors, and lots of lost data.<p>I would not recommend running BTRFS in RAID5 or RAID6 just yet.  Stick with mirroring, if you want to use it, and rebalance to RAID5&#x2F;6 later on when it&#x27;s more stable.