On Linux, I use RAID mirror (mdadm - software reaid). How to configure it so that data is read from both underlying devices and compared, to detect data bitrot and fail in such case?
Is that at all supported?
Would be good option to have.
(Of course as one of layers of protection, for important data)
Traditionally RAID is for uptime or speed, this isn’t that (actually quite the opposite). If you want to do an extra integrity check one of the popular ways to do it is to use a file system that has checksums, like zfs or btrfs.