system disk-clear
Use these commands to delete (clean) various temporary, mail queue, FortiSandbox queue, Microsoft 365 and Google Workspace APIs, archive journal, packet capture, and log files to reduce disk space usage.
Syntax
diagnose system disk-clear tmp
diagnose system disk-clear pqueue
diagnose system disk-clear bqueue
diagnose system disk-clear deferqueue
diagnose system disk-clear deferd
diagnose system disk-clear crashlog
diagnose system disk-clear capture
diagnose system disk-clear sandbox
diagnose system disk-clear tmpmail
diagnose system disk-clear cloud-api
diagnose system disk-clear content_reconstruct
diagnose system disk-clear journal_scan
Example
FortiMail # diagnose system disk-clear tmp
System Time: 2025-05-28 10:23:40 PDT (Uptime: 2d 2h 52m)
The folder tmp will be cleaned up.
Are you sure you want to continue? (y/n)?y
Clean up succeeded