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As written in the previous post related to the upgrade to vSphere 5, the old VCB framework can still be used also with latest version, but is a not supported configuration (I’ve made the test only with a Windows Server 2008 R2 for the VCB proxy, but I suppose that works also with previous OS). Of course the SAN transport mode could not work (or not if you use VMFS5), but the NBD works as on the old vSphere 4.x.

The only issue that I get (but honestly I’ve make only few tests) is on VM with Windows Server 2008 or 2008 R2, both with virtual hardware 7 or 8. The error message is quite strange and generic:

The workaround is to set the disk.EnableUUIDparameter in the virtual machine settings to False by performing the following steps:

  1. Power off the Windows Server 2008 virtual machine through vSphere Client.
  2. Click Settings > Options >General > Configuration Parameters.
  3. Set disk.EnableUUID to False.
  4. Save the settings.
  5. Power on the virtual machine.

Note that the option is exactly the opposite that the default one and also is not the same that you may find in VM backup troubleshooting for most backup programs (for example see the VDR note).

By the way, if you have at least the Essential Plus license you can use VDR instead of VCB. Or could be the right time to choose a real backup program.


Virtualization, Cloud and Storage Architect. Tech Field delegate. VMUG IT Co-Founder and board member. VMware VMTN Moderator and vExpert 2010-24. Dell TechCenter Rockstar 2014-15. Microsoft MVP 2014-16. Veeam Vanguard 2015-23. Nutanix NTC 2014-20. Several certifications including: VCDX-DCV, VCP-DCV/DT/Cloud, VCAP-DCA/DCD/CIA/CID/DTA/DTD, MCSA, MCSE, MCITP, CCA, NPP.