Re: Subject: RFC: Read repair for md RAID1 after mirror read failures

> It's not a simple problem.   For long term archiving, I would try to
> use something with RAID6 or more, and ideally have a filesystem which
> also checksums data.  This is what ZFS does, and which bcachefs does
> as well, but since they're both out of kernel, I don't use either with
> my current home linux setup.
>
> But for long term storage, that could be the way to go.  but then you
> need to periodically scrub your data, which means reading it all,
> checking the checksums and re-writing and fixing corruption.
>
> > My concern is not recovery from an existing read error—that is already
> > handled by fix_read_error()—but rather the long-term aging of cold
> > magnetic recordings.
>
> You really need three or more disks with multiple parity and checksums
> for long term storage.

dm-integrity ...