How do you detect bit flips with software RAID? A scrub can detect differences, but without checksums it&#x27;s ambiguous which copy is wrong. And in the case of mdadm, which has no concept of a file system, it won&#x27;t report the affected file. I&#x27;m not even sure you get an LBA, but if you do, then you have to go look that up, accounting for offsets, with the chosen file system to get a file.<p>Conversely, Btrfs scrubs will report a corrupt file path if there&#x27;s a bit flip in a single copy. If there&#x27;s another copy available then there&#x27;s just a kernel note that there was a data csum error and the problem was fixed, no file name path.