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Error: The parent virtual disk has been modified since the child was created

I was restoring a Virtual Machine with Veeam Backup and Recovery, which seemed to be successful the VM won’t start and gave me the following error:

Failed to open ‘virtual machine disk’:
The parent virtual disk has been modified since the child was created.

Other / similar errors:

  • Failed to open ‘virtual machine disk’ with flags 0xe (The parent virtual disk has been modified since the child was created)
  • Failed to open (The parent virtual disk has been modified since the child was created)
  • DISKLIB-LINK : Attach: Content ID mismatch (7b7644b2 != 4f5a6761)
  • DISKLIB-LINK : Attach: the capacity of each link is different (83886080 != 46399652).

Resolution:

  1. Enable SSH on the vSphere server and log in with your admin/root account.
  2. Go to the folder where the affected VM is stored ( /vmfs/volumes/… )
  3. Open the vmdk file ( vi <vmserver>.vmdk )
  4. Take a note of the CID value
  5. Close vi ( :q )
  6. Open the <vmserver>-001.vmdk
  7. Check the parentCID, this should point to the CID
  8. If this is not the CID value, change it, press i (insert) and change the value, press escape and :w :q (write and quit)
  9. This has to be done for every extra disk in the virtual machine
  10. Check if server starts!

Source:

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