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:
- Connect to the ESXi host that the virtual machine is running on using SSH.
- Navigate to the virtual machine folder using this command:
cd /vmfs/volumes/datastore/virtual_machine/
- List the contents of the directory using the ls command and look for .ctk files.
- Create a temporary directory for the CBT files.
For example:
mkdir tmp
- Move the CBT files to this directory with this command:
mv *-ctk.vmdk tmp/
- Run the snapshot again.
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