Does Windows Deduplication fill up the System Drive?

Question

I enabled the Windows Server deduplication feature on a volume and several days later, I noticed that the system drive is running low on drive space. I read that the deduplication database is stored in a hidden folder of the system drive. What are the recommendations to free up space and/or to avoid having the system drive suddenly fill up?

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Answer 1

Hi ,

Welcome to our new Microsoft Q&A Platform.

The TechNet article https://technet.microsoft.com/en-us/library/hh831700.aspx has a section that describes how to use the Measure-DedupFileMetadata cmdlet to figure out the how much space can be saved by deleting a specified deduplicated folder or file and then running the dedup garbage collection job with the -Full parameter (start-dedupjob <volume> -Type GarbageCollection -Full) to reclaim the space.

The details are towards the bottom of the article under the section titled "Determine potential space reclamation with the Measure-DedupFileMetadata cmdlets"

If the volume is full and you encounter file access failures, run a Garbage Collection job to reclaim disk space by using an elevated Windows PowerShell command prompt:

Start-DedupJob E: –Type GarbageCollection -full

Best Regards,

Candy