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Can someone explain the numbers I'm seeing here, related to server 2012 Dedup?

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On a 2012 Standard server, I have deduplication turned on for a data volume.  Several directories are set up as exclusions in dedup settings, so there are only 2 directories which should be getting deduplicated.  (And one of those is a running VM which should have been excluded, but looks like it got missed.)

The other directory targeted for dedup contains Veeam backup files of several Hyper-V VM's.  When I look at the properties of this volume (Drive D:), I see 0.98TB used, 1.28TB Free, with a capacity of 2.27TB.  

If I select all of the folders on the drive except the 2 that are being deduplicated and pull up the properties window, it shows size: 24.4GB, and size on disk: 24.4GB.  Even the folder with the running VM shows both the size and size on disk as 45.0GB. 

So far, those numbers make sense to me.  But when I pull up the properties of the "D:\Backups" folder, it shows Size: 1.38TB, and Size on disk: 36.7GB.  While I know server 2012 deduplication is good, those numbers don't seem right.  Then, going a step further, I pulled up properties of some individual files inside the D:\Backups directory.  The files in that directory vary in size, anywhere from 5GB to 600GB, but all show a size on disk of 4.00kb.  (Except the newest backup, which hasn't been through a dedup cycle yet, so it still shows the full size and size on disk as the same.)

Is it expected that all files which have been deduplicated would show a size on disk of just 4k?  

What numbers should I believe when it comes to file sizes and disk utilization?  The file size numbers just don't add up, but are the used/free space numbers correct as shown in the volume properties?

Thanks!


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