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What is the default space reserve for 7m 8.2 on a volume?
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In the document 215-07979_A0 Data ONTAP® 8.2 Storage Efficiency Management Guide For 7-Mode on a page 26
You can find there is 4% overhead:
"In a volume, deduplication metadata can occupy up to 4 percent of the total amount of data contained within the volume."
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