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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