Return
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Title
API Call Failed - Unable to access file since it is locked -
Description
Backups become very slow on a VM that has in the past backed up in a relatively short amount of time. -
Cause
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Resolution
In vSphere client first check the VM's directory contents to see if snapshots are present if so then right click on VM and choose snapshot\ consolidate if that fails with error "API call failed unable to access file since it is locked" please reference the following possible Vmware KB solution below: