Look into netapp internal *bug 657692*.  Wasnt available on public bug
tracking as of 2 weeks ago.

we dealt with an internal bug relating to the fingerprint stuck at 0% on our
dedupes with 8.1.2.  I did not see the sawtoothing or volume size go nuts.
We also didnt migrate vfilers.

Fix was to sis stop the dedupe job and restart it with '*sis start -s
volume*'.   basically rededupes from scratch your whole volume.  Netapp
actually had us run a perfstat while we fixed a few volumes with this to
gather more data on the bug.  All i have gotten out of them is that the
'math' gets off at some point under certain conditions.  While i ran this i
did not lose any previously deduped space, so my volume didnt instantly blow
up.  Just offering up in case its related somehow to your issue.



-dave



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