Hi,
As far as I know, dedup is supported on Refs formatted mirror accelerated party volumes.
Mirror-accelerated parity is a Storage Spaces storage layout.
Deduplication will work on any ReFS volume on Server 2019.
Some related articles for your reference:
(Please note: Information posted in the given link is hosted by a third party. Microsoft does not guarantee the accuracy and effectiveness of information.)
Thanks for your time!
Best Regards,
Anne
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