>- RAID1 pairs, plus some kind of intelligent overlay filesystem, eg >md-linear+XFS / BTRFS. With the filesystem aware of the underlying >arrangement it can theoretically optimise file placement and >dramatically increase write speeds for small files in the same manner >that RAID-0 theoretically achieves. (However, still no protection >against "silent" single drive corruption unless btrfs perhaps adds this >in the future?)
not only "silent" single drive corruption problem but as I stated in start of topic - crash of first pair.