Description | This article describes a known issue users might face with the FortiGate virtual machine appliances. This results in the FortiGate VM appliance entering the memory conserve mode due to high SLAB memory usage. |
Scope | FortiOS 7.2 or later. |
Solution |
Known issue #915585 impacts FortiGate virtual machine appliances running FortiOS v7.2.4 to v7.2.7 or v7.4.0 to v7.4.1.
diagnose hardware sysinfo memory MemTotal: 8170028 kB Slab: 4766984 kB <------------ This is the SLAB memory usage. **output-omitted**
#name <active_objs> <num_objs> <objsize> <objperslab> <pagesperslab> : tunables <limit> <batchcount> <sharedfactor> : slabdata <active_slabs> <num_slabs> <sharedavail> The above output shows an unusually high total count of slab objects for the TCP and non-TCP sessions, despite the session count being relatively low.
Note: This issue only affects the FortiGate virtual machine appliances and not the hardware FortiGate models.
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