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Forum Discussion
How does bitrot protection actually work?
I understand the concept, but am curious how it is actually implemented on 6.2.0
StephenB wrote: There are several posts on this topic, mostly speculative on the details.
Hence my comments in this forum about having a definitive technical source.
StephenB wrote: What we know for sure is that
(a) BTRFS includes a checksum feature, and that is enabled when bitrot protection is on.
(b) if a checksum error occurs, then bitrot is detected, and the Netgear algorithm attempts to repair it from the RAID parity blocks. This is different from normal RAID repair, which is triggered by a read failure (not a checksum error).
One or two users have reported cases there this algorithm failed to recover data with a correct checksum. So far I have not seen any users reporting a case where it did recover data.
BUT what prompts for a checksum error to be discovered?
i.e. Does BTRFS regularly do checksum testing unprompted? Is it only on a data write? Is it on a data read? etc
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