Deleting a snapshots failed with the error: the virtual disk is either corrupted or not a supported format

 Error file location :

Two ways to see the vmware.log files

Method 1: using CLI

1.ssh into the ESXI host
2.navigate the virtual machine file path   Cd /vmfs/volumes/storage lun name/virtual machine name /
3.Cat vmware.log | more
4.hit space bar to see the log entries for the specific time
        
Note : the time might be in the UTC time if the esxi host is in UTC.

5.Look for the error on the specific time snapshot removal was initiated, the error will be “ SNAPSHOT: SnapshotConsolidateOpenDisks failed: Could not open/create change tracking file “

 Method 2 : Using GUI
1.In the vsphere client browse the datastore and navigate to the virtual machine file
2.Select the vmware.log file the current one and download to your desktop.
3. Open the file with wordpad or notepad and look for the error on the snapshot removal initiated time.
“ SNAPSHOT: SnapshotConsolidateOpenDisks failed: Could not open/create change tracking file”

 How to fix this issue :
1. Create a temp folder on the same datastore
2. Move all the files end with .CTK extension to the temporary folder
3. Go back to the vm and initiate the snapshot removal again.


Note : sometimes you may get the same error again but the snapshot will get deleted even though it is showing the same error.