On Fri, Jan 13, 2012 at 04:48:44AM +0400, Jim Klimov wrote:
> As Richard reminded me in another thread, both metadata
> and DDT can contain checksums, hopefully of the same data
> block. So for deduped data we may already have a means
> to test whether the data or the checksum is incorrect...

It's the same chksum, calculated once - this is why turning dedup=on
implies setting checksum=sha256 

> Incdentally, the problem also seems more critical for
> the deduped data ;)

Yes.  Add this to the list of reasons to use ECC, and add 'have ECC'
to the list of constraints to circumstances where using dedup is


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