RAID1 will not get you any protection from bit flips unless you have some specialized software doing that.<p>RAID1 will speed up reading by spreading reads across both disks, but data returned by the array comes from one disk or the other, not both.  This means there is no opportunity to detect if a bit flip occurred.<p>Adding a checksumming filesystem that is handling the RAID1 in software would solve this problem. (i.e. If it were hardware RAID as opposed to ZFS&#x27;s RAID-Z, ZFS could detect a bit-flip on the hardware RAID1, but it can&#x27;t do anything about it since it is not aware of the two physical disks as a redundant source of data.)