According to Microsoft, some Windows Server 2008 R2 users with the hypervisor role installed have been experiencing problems related to operations such as the backing up or the restoration of Hyper-V virtual machines (VMs). These issues occur when you back up or restore Hyper-V virtual machines (VMs).
Problems involve, receiving the 0x800423f4 error code when backing up virtual machines, failed VM backup operations, data loss and corruption.
Microsoft offered customers explanation of the causes that generate the glitches mentioned above:
A supported hotfix is available from Microsoft.
After you install this hotfix on the Hyper-V server, you must update the Integration Components in the virtual machines. To do this, open the Virtual Machine Connection for the virtual machine in Hyper-V Manager, and then select the Insert Integration Services Setup Disk option on the Action menu.
[tags]ws 2008 r2[/tags]