http://d.hatena.ne.jp/den8/20100727/1280232047
http://www.joshbryan.com/blog/2008/01/02/lvm2-mirrors-vs-md-raid-1/
My first results showed almost the same throughput for LVM-mirror and MD-RAID1 with a slight better performance on LVM-mirror (but only 1-2 MB/sec).
But then I tested with _two_ files simultaneously on the same filesystem and there I found a much better performance on read with MD-RAID1 (about 1.5 times of LVM-mirror or no mirror).
めも、未検証
