On Tue, 19 Aug 2014 18:21:52 +0200 M G Berberich <bt...@oss.m-berberich.de> wrote:
> · BtrFS with RAID1 is fairly stable. Maybe, but it's not optimized for performance: reads are not balanced in the most optimal way, and writes may end up being submitted sequentially rather than in parallel to two devices, resulting in write performance that's way less than that of a single device. > · RAID 5/6 spreads all data over all devices, leading to performance > problems on large diskarrays, and there is no option to limit the > numbers of disk per stripe so far. AFAIK Btrfs RAID 5/6 is not yet ready to be used in a production environment; In your case I would recommend considering Btrfs on top of two 12-disk mdadm RAID6 arrays, or three 8-disk ones, leaving one HDD as a shared hot spare. To join the mdadm arrays into a larger block device you can use either LVM, or Btrfs itself, with the "single" profile for data. -- With respect, Roman
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