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This issue occurs when ever the CBT tracking done in VMware Esxi server fails to the track the disk block changes. Please try the solutions given below and check whether you are able to fix the reported issues.

Solution 1:

Configuring additional full backup will reset the CBT for entire backup schedule, hence CBT will reset to all the available VM’s in the backup schedule.

Solution 2:

If you wish to reset the CBT for specific VM without disturbing CBT tracking for other VM’s then follow the below steps.

  1. Power off the VM
  2. Right click the VM, click “Edit settings”, find the “Options” tab and click “Configuration Parameters”
  3. Set the “ctkEnabled” value to false
  4. Set the “scsi0:x.ctkEnabled” value to false for each disk of the VM in question
  5. Open the source folder and remove any -CTK.VMDK files.
  6. Power on the VM
  7. Power off the VM again. This step is needed to update the CTK table.
  8. Power on the VM
  9. Re-run Backup job.

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