Technical Note: Memory usage insights in FortiOS v5.0

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Description

Memory usage on the FortiGate is represented as a single gauge in the GUI or a counter in SNMP, ranging from 0 to 100%.

Even though this counter is easy to read, it needs to be analyzed with deeper attention when reaching high values as it is mixes multiple memory related indicators.

The attached document provides an insight into memory usage in FortiOS 5.0.

Scope

Memory usage on the FortiGate.

Solution

See attached document.