Microsoft Virtualization Discussions

Reclamation within NTFS filesystem of Hyper-V guest



Are there any plans to introduce a cmdlet that can reclaim space within a Hyper-V guest NTFS filesystem? 

Also, I read that Windows 2012 offers UNMAP support at the guest and the parent, but I also heard the performance of the parent UNMAP against the storage array can be overwhelming.  So any idea if you could have UNMAP enabled at the guest and disabled at the parent, and then use Invoke-NaHostVolumeSpaceReclaim on the parent LUN to reclaim space freed by the guest?





Hi, Madden!

You may want to take a look at the TechEd presentation on Hyper-V storage. With Windows 2012, you can hole punch from the guest through the VHDX. They show a demonstration of it in this video.

The NetApp Windows Host Utilities 6.0.1 will disable automatic unmap in the parent, but you can schedule run the Invoke-NaHostVolumeSpaceReclaim in the parent to run off-peak hours and/or throttle the unmap work with the -UnmapSize variable in the latest version of the Cmdlet.

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