Btrfs raid7 (3 parities) could be useful. But more parities really doesn't scale very well. Raid10 does scale. So does GlusterFS. A bigger scalability problem

Btrfs raid7 (3 parities) could be useful. But more parities really doesn't scale very well. Raid10 does scale. So does GlusterFS. A bigger scalability problem with Btrfs, is its raid10 implementation. Conventional raid1+0 says you can lose more than one devices at a time so long as you don't lose two mirror pairs. Btrfs raid10 doesn't have consistent mirror pairings, so the mirrored chunks for device A1 aren't all on B1, they will be distributed on multiple other drives thereby increasing the chances B1 chunks are lost in a 2+ device failure. Developers plain n-way raid1 Very Soon Now™ and hopefully will get around to better guarantees with raid10 to make it scale like raid10 should.