Hello,
On Thu, Aug 20, 2020 at 05:30:20PM -0400, Dan Ritter wrote:
> David Christensen wrote:
> > Some people have mentioned md RAID. tomas has mentioned LUKS. I believe
> > both of them add checksums to the contained contents. So, bit-rot within a
> > container should be caught by the container driver.
>
> This is incorrect. The systems that checksum every write and
> recalculate and match on every read are BTRFS and ZFS.
>
> LVM, LUKS, and mdadm do not.
Indeed, although dm-integrity can now be used with LUKS (with or
without encryption) to add checksums that force a read error when
they don't match. When there is redundancy (e.g. LVM or MD) a read
can then come from a good copy and the bad copy will be repaired.
Here is a practical example:
https://gist.github.com/MawKKe/caa2bbf7edcc072129d73b61ae7815fb
I haven't yet used it in production but if anyone has I would be
really interested to see a with and without comparison of
performance.
Cheers,
Andy
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