Panorama maintains a ring file that maps the segments and partitions that Dedicated Log Collectors use to store logs. An M-Series appliance in Panorama mode stores the ring file on its internal SSD; a Panorama virtual appliance stores the ring file on its internal disk. When a system failure occurs, a non-HA Panorama cannot automatically recover the ring file. Therefore, when you replace Panorama, you must restore the ring file to access the logs on the Dedicated Log Collectors.