Re: [Dovecot] RAID1+md concat+XFS as mailstorage

• 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.