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How to reclaim space from thin provisioned VM

by Patrick Durante on November 18th, 2014

Download sdelete from sysinternals for windows.  Run the following command for your drive letter.

sdelete.exe z [DRIVE:]

Enable SSH for your VM host and locate the .vmdk file of the host.

To see the actual size run:

du h [DISKNAME].vmdk

Punch all the zeroed blocks out of the vmdk.

vmkfstools punchzero [DISKNAME].vmdk

That’s it.  You’ll notice the size of VM has decreased.

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