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Lower efficiency ratios after data migrating from FAS to AFF

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Issue

After migrating data from FAS8200 (ONTAP 9.1) to AFF A20 (ONTAP 9.16.1) using robocopy, efficiency ratios appear lower on the new system. 

Old-system::> df -S -h
Filesystem                used       total-saved    %total-saved    deduplicated    %deduplicated    compressed    %compressed  Vserver
/vol/vol1/             143GB              29GB             17%            10GB               6%          18GB            11%  vol1

New-system::> df -S -h
Filesystem                used       total-saved    %total-saved   deduplicated    %deduplicated    compressed    %compressed   Vserver
/vol/vol1/             149GB              14GB              9%     15032385536               9%             -              -  vol1

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