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I have a host running Server 2012 R2, and a file server VM also running 2012 R2.

The VM has 3 drives, OS.vhdx, file-1.vhdx and file2.vhdx.

Dedupe is running inside the VM on file-1.vhdx and file2.vhdx.

I have checked via file shares and no-one is using the server, to be sure, i disabled file and print sharing - in short, no files are being physically added to the drive by any user.

For some reason file-1.vhdx is continuously expanding out at around 5GB per hour, even when there is no data being written to it.

I have disabled dedupe and appears data is being expanded regardless.

I ran a utility called OpenedFilesView.exe, and saw a stack of files open on the drive that file-1.vhdx maps to, and they are pointing to the the fsdmhost.exe process.

Could this be a Windows bug? Will dedupe not use existing space on the vhdx, or will it cause it to expand?

Any recommendations please on how to stop this forever growing drive?

morleyc
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1 Answers1

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Download this tool to reveal the source of the problem and which directory is eating your disk

https://windirstat.net/

once you know the source you can solve

Ahmed Abdelazim
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  • I use this software, too: it could provide some insight and starting point. – simlev Sep 15 '18 at 21:24
  • Thanks for the reply, no files are being added to the file system, this does appear to be dedupe related since disabling and rebooting the vhdx is no longer growing. – morleyc Sep 15 '18 at 21:30