If you are setting up a custom mission or instant action, this is where you want to start.
Access the device interface (serial, SSH, or local menu) and check: jade phi p47 01 removing all full
df -h # see partition usage
du -sh /var/log/* # check log sizes
journalctl --disk-usage # for systemd-based systems
On Jade Phi specific menu (via keypad or terminal): If you are setting up a custom mission
After removing all full data, prevent recurrence: Remove External Tanks: If you have drop tanks