You're supposed to run dm scrubs as well, if you don't it is possible that you have a bad sector somewhere on your disks. See http://en.gentoo-wiki.com/wiki/RA

You're supposed to run dm scrubs as well, if you don't it is possible that you have a bad sector somewhere on your disks. See http://en.gentoo-wiki.com/wiki/RAID/Software#Data_Scrubbing http://en.gentoo-wiki.com/wiki/RAID/Software#Data_Scrubbing