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 appropriate. -- Dan.
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