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  1. Migration Toolkit for Virtualization
  2. MTV-4579

MTV warm migration shows false CBT warning even when CBT Is enabled on VMware VM

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: Undefined Undefined
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    • 2.10.z
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    • Incidents & Support
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    • Customer Reported

      Description of problem:

      While performing warm migration of a VMware virtual machine to OpenShift using Migration Toolkit for Virtualization (MTV), the MTV console displays the following warning:
      ~~~
      Changed Block Tracking (CBT) has not been enabled for this device. This feature is a prerequisite for VM warm migration.
      ~~~
      
      Note that: This warning is shown even though CBT is already enabled on the source VMware VM and the VM does not have any snapshots.
      
      Observed Behavior
      - CBT is verified as enabled on the VMware VM.
      - Still displays the CBT-related warning.
      - If CBT is removed and re-added from the VMware console, the warning disappears.
      - This workaround must be repeated every time the warning appears.
      
      
      

      Version-Release number of selected component (if applicable):

      Observed in MTV 2.10

      How reproducible:

      Always
      

      Steps to Reproduce:

      1. Enable CBT by  setting `ctkEnabled TRUE and SCSI0:0.ctkEnabled TRUE`
      2. Migrate VM (Warm) from VMWare to OCP
      3. Warning appears while creating Plan itself
      4. Power off the VM --> Remove the CBT settings --> Re-configure the same[1]
      
      

      Actual results:

      The warning appears even when the CBT is enabled at first place.
      To make it disappear we have to remove and reconfigure the CBT settings on VM 

      Expected results:

      The warning should not appear when CBT is enabled already 

        1. image002 (1).png
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          Kenny Tordeurs
        2. Screenshot 2026-02-18 at 13.02.37.png
          14 kB
          Kenny Tordeurs

              gcasey@redhat.com Gwendolyn Casey
              rhn-support-harspati Harshada Patil
              Chenli Hu Chenli Hu
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                Created:
                Updated: