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Title
Backup fail with "Unable to access file since it is locked" -
Description
It is observed that a backup of one VM fails with: "Error: API Call failed with message: Unable to access file since it is locked"
Error message is present in vSphere as well.
Creating a snapshot at the beginning of the backup is successful, removing the snapshot fails each time with the mentioned error message.
Same behaviour is observed when taking and removing a snapshot in vSphere.
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Cause
One of the ESXi hosts holds a lock on the VM -
Resolution
Remove the lock from the VM by following this VMware KB article