On Wed, 8 Jul 2015 at 17:18 Colin Fee <tfeccles@gmail.com> wrote:

Others will give a more comprehensive answer but you use btrfs (or for that matter zfs) instead of software raid and let it manage the raid and file system. BTRFS and Zfs work from the block level up.
That is what I've done successfully on my media server using zfs.

My understanding though (from what was said yesterday) is that BTRFS with "RAID" support (currently) offers no guarantee that two copies of everything will be on separate disks. So if one disk fails, you could loose both copies of your data.