Snapshot creation failed.

Problem :

I experience this snapshot error with VEEAM backup and replication. For both  the error ,one single solution worked for me .

Error :

1) Consolidating virtual machine snapshots fails with the error: Change tracking target file already exists 

or

2) Creating Snapshot failed : The virtual disk is either corrupted or not a supported format.

 

Resolution :

To resolve this issue, the CBT files need to be moved out of the working folder of the affected virtual machine(s).

To move the CBT files and consolidate snapshots:

1. Connect to the ESXi host that the virtual machine is running on using SSH.
2. Navigate to the virtual machine folder using this command:

   cd /vmfs/volumes/datastore/virtual_machine/

3. List the contents of the directory using the ls command and look for .ctk files.
4. Create a temporary directory for the CBT files.

   For example:

   mkdir tmp

5. Move the CBT files to this directory with this command:

   mv *-ctk.vmdk tmp/

6. Run the snapshot  again.