Server 2012 R2 - Dedup chunk store bigger than original data

Hi there,
I have a fresh install of a Windows Server 2012 R2 as fileserver with deduplication enabled on several volumes. One volume shows a strange behavior after a couple of weeks in productive environment: Initially I had a dedup saving rate of ~10% (volume contains
mainly images), but after a few weeks, both UI and PowerShell report savings of 0 bytes.
What is really bad about this is, that the original size of the un-deduplicated files is about 880 GB and my volume has filled up to nearly 1 TB (no, data has not increased that much over time, only a few gig). Watching the volume using TreeSize (JamSoft)
I found out, that the dedup folder has grown to 990 GB!
I tried to run optimization and garbage collection with no luck. The main folder is DFS replicated and (still) doing initial sync - this may change files, but dedup is configured to dedup files after 0 days.
Any ideas?
Regards,
Marc

Hi Marc,
From the screenshot it seems that almost all files are put into Dedup folder.
Deduplication supports DFSR so I cannot confirm if it is the cause. However as the initial replication is still running and dedup schedule is set as 0 days, I think we can first eliminate one of them to see if issue could be fixed.
A. So please test to disable Deduplication until initial replication is done - disable Deduplication could help you get rid of the current situation and if the issue is DFSR related, after initial replication is finished, files will not be edited so frequently
which should help on this issue.
Note: In order to speed up the initial replication, you can copy files to target server as a pre-staging so that data will not need to be replicated through DFSR. And if files will not be change during replication, you can use the new function of Windows
2012 R2 that to copy metadata to target server. See:
DFS Replication Initial Sync in Windows Server 2012 R2: Attack of the Clones
http://blogs.technet.com/b/filecab/archive/2013/08/21/dfs-replication-initial-sync-in-windows-server-2012-r2-attack-of-the-clones.aspx
B. You can also set Deduplication schedule back to 5 Days (the default setting) - You may need to redo an optimization to un-dedup all files (similar to disable dedup) first to get rid of current situation. As the schedule is set to 5 days, files will not
be dedup immediately which should also help on this issue.
If you have any feedback on our support, please send to [email protected]

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