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VMDK to VHDX conversion causes errors described in KB 2470478 RRS feed

  • Question

  • Hi all,

    this is the situation:

    We are converting multiple VMs (Windows 2008 - not R2) from ESXi 5.1 to Hyper-V 2012 R2.
    The conversation itself is always successful but when we check the event log in the migrated servers we see errors like:

    ESENT ... could not read header... c:\windows\softwaredistribution\datastore\logs\edb.log ... wuaueng.dll
    --> Windows Update is not working anymore.

    This seems to be caused by the problem described in KB http://support.microsoft.com/kb/2470478:
    Applications that are built on ESENT and that run on a Windows Vista-based or Windows Server 2008-based computer may not work correctly after the reported physical sector size of the storage device changes.

    I think the sector size changes during conversion to VHDX.

    The KB says also that this affects many applications that are built on ESENT like AD, CA, ...

    Questions:
    Should the mentioned fix be already included in any updates?
    Shall we install the hotfix prior to conversion?
    What is the risk for AD when we migrate our DCs to Hyper-V?

    Hope you can help to find out the risk we have regarding this bug. :-)

    Thanks!!!

    Wednesday, December 3, 2014 12:10 PM