Section 14 - Backup / Restore Microsoft Virtual Machines

This section describes in detail how to backup and restore virtual machine running on Microsoft Hyper-V Server with OBM.

14.1.5 How to restore Microsoft virtual machines

A VM can be restored to the original location with the following conditions:




• - If the VM to be restored does not exist on the original hypervisor. The VM will be restored as a new virtual machine.
• - If the VM to be restored still exist on the original hypervisor. The existing VM will be replaced by the backed up version.



Important:
Virtual machine backed up with the MS VM backup module can only be restored to the original Hyper-V server.





Refer to the following instructions to restore VM running on Microsoft Hyper-V Server.



• Login to the backup application's user interface.




• Select the [Restore] button and the corresponding backup set.




• Select the virtual machines to be restored and choose [Original location] for restore files to.





Note:
Select the Initial Store to restore the Authorization Manager Security (role based access control) settings




• Click the [Start Restore] button to begin the restore process.
• User will be prompted if a virtual machine selected to be restored exist on the hypervisor.





Important:
For restore of existing virtual machine (restoring a previous version), the existing virtual machine will be removed before the restore process begin.




• When the restore process is completed, the virtual machines will be restored to the original hypervisor.
• Open Hyper-V Manager, click Start, Administrative Tools and click Hyper-V Manager.




• Under Virtual Machines, right click on the newly restored virtual machine, select [Setting].
• Modify settings which may be conflicting with other existing virtual machines (e.g. network setting).




• Start the virtual machine afterward.



Important:
If the following error is displayed during the startup, please remove the Saved State of the corresponding VM.







In Hyper-V Manager, right click on the corresponding VM and select [Delete Saved State], start the VM again afterward.






• For any virtual disk that was not restored (e.g. original backup source did not include all virtual disks configured for the VM).



Continue to the next steps for instruction to remove the missing virtual disk from the virtual machine's configuration.





For original virtual machine with no snapshot




• Open Hyper-V Manager.




• Under Virtual Machines, right click on the newly restored virtual machine, select [Setting].
• For each virtual disk that was not restored, remove the corresponding [Hard Drive] setting from [Hardware].




• Start the virtual machine afterward.



Important:
If the following error is displayed during the startup, please remove the Saved State of the corresponding VM.







In Hyper-V Manager, right click on the corresponding VM and select [Delete Saved State], start the VM again afterward.









For original virtual machine with snapshot




• Locate the virtual machine's folder location on the Hyper-V server.



Important:
Serious problem may occur if the configuration files are incorrectly modified; it may prevent the virtual machine from starting.



Please only perform the following procedures if you have in-depth knowledge on Hyper-V management.




• Stop the Hyper-V Virtual Machine Management service.




• Remove the corresponding entry from the Virtual Machine configuration ${VM-GUID}.xml file.



• Open the corresponding ${VM-GUID}.xml file at the following location with a text editor.

${VM-Location}\Virtual Machine\${VM-GUID}.xml



• Locate the line of all non existing VHD.

<controller0>
<drive0>
       <pathname type="string">D:\Hyper-V\Virtual Machine Name\Virtual Hard Disks\Name_GUID.avhd</pathname>
       <type type="string">VHD</type>
   </drive0>
   <drive1>

       <pathname type="string">D:\Hyper-V\Virtual Machine Name\Virtual Hard Disks\Second_Disk_GUID.avhd</pathname>
       <type type="string">VHD</type>

   </drive1>
</controller0>



• Modify the line from:

  <type type="string">VHD</type>

  To

  <type type="string">NONE</type>

  <controller0>
  <drive0>
         <pathname type="string">D:\Hyper-V\Virtual Machine Name\Virtual Hard Disks\Name_GUID.avhd</pathname>
         <type type="string">VHD</type>
     </drive0>
     <drive1>
  
         <pathname type="string">D:\Hyper-V\Virtual Machine Name\Virtual Hard Disks\Second_Disk_GUID.avhd</pathname>
         <type type="string">NONE</type>
  
     </drive1>
  </controller0>
  

• Save the changes afterward.


• Remove the corresponding entry from the Snapshot configuration ${GUID}.xml file.


• Open the corresponding snapshot's ${GUID}.xml file at the following location with a text editor.

${VM-Location}\Snapshots\${GUID}.xml

• Locate the line of all non existing virtual disk.

  <controller0>
  <drive0>
         <pathname type="string">D:\Hyper-V\Virtual Machine Name\Virtual Hard Disks\Name_GUID.avhd</pathname>
         <type type="string">VHD</type>
     </drive0>
     <drive1>
  
         <pathname type="string">D:\Hyper-V\Virtual Machine Name\Virtual Hard Disks\Second_Disk_GUID.avhd</pathname>
         <type type="string">VHD</type>
  
     </drive1>
  </controller0>
  

• Modify the line from:

  <type type="string">VHD</type>

  To

  <type type="string">NONE</type>

  <controller0>
  <drive0>
         <pathname type="string">D:\Hyper-V\Virtual Machine Name\Virtual Hard Disks\Name_GUID.avhd</pathname>
         <type type="string">VHD</type>
     </drive0>
     <drive1>
  
         <pathname type="string">D:\Hyper-V\Virtual Machine Name\Virtual Hard Disks\Second_Disk_GUID.avhd</pathname>
         <type type="string">NONE</type>
  
     </drive1>
  </controller0>
  

• Repeat the same step for each snapshot.


• Start the Hyper-V Virtual Machine Management service.




• Remove any existing snapshot.



Important:
The restored virtual machine does not support the reversion of previous snapshots if they contain virtual disks not restored.




• Start the virtual machine.



Important:
If the following error is displayed during the startup, please remove the Saved State of the corresponding VM.







In Hyper-V Manager, right click on the corresponding VM and select [Delete Saved State], start the VM again afterward.





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