Actually, it does create huge impact, just this morning I have another appliance started to act the same, making huge business impact. I performed that last upgrade as they promise it will be solve but here we are again and I'm afraid even if they released a new update they problem will continue.
> FortiGate enters conserve mode when memory used"1585 MB" is below the red threshold"1769" and even below the green threshold.
The reported issue matches the internal engineering ticket 0798303. Due to a miscalculation the conserve mode might be triggered before reaching the red threshold. The cause got resolved in code in FortiOS 7.0.8 and 7.2.4.
> my current OS is 7.2.3, what is your suggestion?
FortiOS 7.2.4 got released recently, 7.0.8 is available since a longer time.
It's recommended to upgrade to 7.2.4.
> As a temporary solution I have raised red threshold.
Correct, as a workaround the thresholds should be increased:
config system global set memory-use-threshold-extreme 97 set memory-use-threshold-green 90 set memory-use-threshold-red 95 end
And reverted back to the default after upgrading:
config system global unset memory-use-threshold-extreme unset memory-use-threshold-green unset memory-use-threshold-red end
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