Server 2012, 2012 R2 & 2016 Disable Or Remove Deduplication On A Volume

I just thought I’d post about this,as it’s something I’ve come up against recently, how to disable deduplication on a volume on Server 2012, 2012 R2 or 2016 and inflate the data back to it’s original form. In this example, the volume in question is E:

So let’s start with step one;
DO NOT DISABLE DEDUPLICATION ON THE VOLUME
If you disable dedup on the volume first, you simply stop new data being processed, rather than rehydrating your already deduplicated data.

So with that in mind the, step two would be to run the following command in PowerShell;
Start-DedupJob -Type Unoptimization -Volume E: -Full

When that job has completed, which you can check with the Get-DedupJob
command step three is to run the following command to start your garbage collection on the volume;
Start-DedupJob -Type GarbageCollection -Volume E: -Full

Finally, after that, step four is to turn off dedup on the volume with the following command;
Disable-DedupVolume -Volume E:

And that should save you any unnecessary drama.

Note
When all this is done, the volume will still show in some places like server manager sat at 0% deduplication rate, which is fine, as we’ve turned it off. I would guess this is just a bug, but it seems once a volume has been touched by the deduplication processes, it never goes back to a blank value for dedup rate.

2 Replies to “Server 2012, 2012 R2 & 2016 Disable Or Remove Deduplication On A Volume”

  1. Hey Mark,

    You state “DO NOT DISABLE DEDUPLICATION ON THE VOLUME”.

    What if this was already done? Should I turn it back on? or Just run the unoptimization after the fact.

    Thank you,
    Spencer Lemm

    1. Hi Spencer, generally if you’ve turned off dedup already, you should be safe to turn it back on, making sure any optimisation schedules are stopped, then run the un-optimisation and garbage collection routines, then turn dedup off again. Hope that helps.

      edit
      I should have added, and when you’re running the un-optimisation and garbage collection jobs, make sure the in-optimisation finishes, then run the garbage collection, then turn off dedup when the garabge collection job is done.

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