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On the firewall, the CPU on a specific Core might go high on SoftIRQ.
Free memory on the device goes low. A high file system cache consumes a lot of memory.
To observe the issue:
get sys per status
Memory: 49539064k total, 17105140k used (34.5%), 544324k free (1.1%), 31889600k freeable (64.4%) <----- Intermittent traffic issue observed.
Memory: 49539064k total, 16674616k used (33.7%), 2786832k free (5.6%), 30077616k freeable (60.7%)
'diag hardware sysinfo memory' shows high cache memory usage.
Apply one of the following options as a workaround.
- Disable disk logging or filter out the forward-traffic log type.
- Delete FortiGate traffic logs stored in the local disk,
- Configure the Fortianalyzer/Syslog server.
To delete logs on the disk,
execute log filter category 0
execute log filter device 1
execute log delete
To solve the issue permanently, upgrade to FortiOS v7.2.8, v7.0.14, or v7.4.4.
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