2012-01-13 2:34, Jim Klimov wrote:
I guess I have another practical rationale for a second
checksum, be it ECC or not: my scrubbing pool found some
"unrecoverable errors".
...Applications need to know whether the digest has
been changed.

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

Just a thought...
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