When Changed Block Tracking (CBT) is enabled and ESXi hosts in the environment are running ESXi 5.1 or later, you experience these symptoms:

  • When attempting a snapshot consolidation, virtual machines running on block storage power off.
  • Virtual machines state that an error occurred during the quiesce process.


For more details and to address the issue, please follow the recommendations available under VMware KB 2144095:

According to the article above, for ESXi v.5.5 and 6.0, the issue is resolved in the patches below:

  • ESXi 6.0, Patch Release ESXi600-201608001.
  • ESXi 5.5, Patch Release ESXi550-201608001.