Hyper-V storage migration fails when you try to migrate VHD and configuration files to CSV volumes in Windows Server 2012

Applies to: Windows Server 2012 DatacenterWindows Server 2012 DatacenterWindows Server 2012 Standard


Consider the following scenario:
  • You install the Hyper-V role on a Windows Server 2012-based two-node failover cluster.
  • You have two Cluster Shared Volumes (CSV) volumes.
  • You create a virtual machine on a cluster node. The virtual machine has a single 60-gigabyte (GB) fixed-size virtual hard disk (VHD).
    Note The virtual machine is not created on a CSV volume.
  • On the cluster node, the available space on drive C is less than 20 GB.
  • In the Hyper-V Manager console, you try to move the VHD file to one CSV volume, and you try to move the configuration files to the other CSV volume.
    Note The CSV volumes have enough space to hold the VHD file and the configuration files.
In this scenario, the migration operation fails, and you receive an error message that resembles the following:
Migration did not succeed. Not enough disk space at '\'.

Note This issue still occurs after you install hotfix 2844296. For more information about hotfix 2844296, click the following article number to view the article in the Microsoft Knowledge Base:
2844296 Shared Nothing Live Migration fails when you try to migrate a virtual machine to a destination server in Windows Server 2012


This issue occurs because the target CSV volumes are incorrectly identified as being a system drive volume instead of multiple separate CSV volumes.


Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix Download Available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website: Note The "Hotfix Download Available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.


To apply this hotfix, you must be running Windows Server 2012.

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix replaces the hotfix that is described in Microsoft Knowledge Base (KB) article 2844296.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates