Deleting Snapshots - VMware
docs.vmware.com › en › VMware-vSphereJul 22, 2019 · Deleting a snapshot consolidates the changes between snapshots and previous disk states and writes all the data from the delta disk that contains the information about the deleted snapshot to the parent disk. When you delete the base parent snapshot, all changes merge with the base virtual machine disk. To delete a snapshot, a large amount of information needs to be read and written to a disk.