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How does Data Deduplication in Windows Server treat a newly written file?
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Alex
Deduplication had to be designed so that turning it on never slows the workload down, and the post-processing model is how that promise is kept. A write lands on the volume in the ordinary way, and a scheduled optimization job later splits files into chunks, keeps one copy of each unique chunk in a chunk store and replaces the duplicates with reparse points. The consequence for capacity planning is that savings appear after the job has run, not at the moment of the write, and that a volume needs headroom for data that has not yet been optimized. It also means the job schedule matters: a volume with a heavy write pattern and a short optimization window never catches up.
Sourcelearn.microsoft.com
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