[Dovecot] RAID1+md concat+XFS as mailstorage

[Wojciech Puchar]

>> (unless we are talking temporary removal and re-insertion?)
> nope, I'm talking about complete pair's crash when two disks die.
> I do understand that's the possibility of such outcome (when two disks in the same pair crash) is not high, but
> when we have 12 or 24 disks in storage...

then may 6-12 filesystems. overall probability of double disk failure is 
same, but you will loose 1/6-1/12 of data.

>