Technical Tip: Explaining the 'diagnose hard sysinfo memory' command

To see the memory allocated by the kernel the following commands show the same outputs and can be used:

get hardware memory

fnsysctl cat /proc/meminfo

diagnose hard sysinfo memory

Here is how to read this command to determine the memory of the device during troubleshooting:

diagnose hard sysinfo memory
MemTotal: 1911036 kB            <- Total Memory of the hardware.
MemFree: 911804 kB              <- Total free memory of the hardware.
Buffers: 47244 kB               <- Buffer size for temporary memory.
Cached: 393348 kB               <- Cached memory for disk I/O access.
SwapCached: 0 kB                <- Cache for memory pages.
Active: 573964 kB               <- Memory used for recently used processes.
Inactive: 76000 kB              <- Memory used for processes that were not recently active.
Active(anon): 463264 kB         <- Anonymous memory.
Inactive(anon): 24252 kB        <- Anonymous memory.
Active(file): 110700 kB         <- Buffer/cache memory which is in active use. This memory is in recent use and is not used by any other process.
Inactive(file): 51748 kB        <- Buffer/cache memory which is free. This memory is not in use and can be used by any other process.
Unevictable: 0 kB               <- Pages can't be swapped out for multiple reasons.
Mlocked: 0 kB                   <- Pages locked to memory, Mlocked pages are also Unevictable.
SwapTotal: 0 kB                 <- Total Swap space in memory.
SwapFree: 0 kB                  <- Free Swap space in memory.
Dirty: 20 kB                    <- Memory in wait to get written back to the disk.
Writeback: 0 kB                 <- Memory which is currently written on the disk.
AnonPages: 209384 kB            <- Non file back pages mapped into user space.
Mapped: 78796 kB                <- Mapped files like, libraries.
Shmem: 278144 kB                <- Shared memory.
Slab: 89648 kB                  <- in-kernel data structures cache.
SReclaimable: 8292 kB           <- Part of slab/memory which can be claimed.
SUnreclaim: 81356 kB            <- Part of slab/memory which can not be claimed.
KernelStack: 1360 kB            <- Non-reclaimable kernel memory.
PageTables: 16720 kB            <- Amount of memory dedicated to the lowest level of the page.
NFS_Unstable: 0 kB              <- Memory not promised to the storage.
Bounce: 0 kB                    <- Memory used for bounce buffers.
WritebackTmp: 0 kB              <- Memory used for temporary purpose for writeback buffers.
CommitLimit: 955516 kB          <- Amount of memory available to be allocated.
Committed_AS: 7521252 kB        <- Sum of all the memory available to be allocated.
VmallocTotal: 663552 kB         <- Total size of Vmalloc memory area.
VmallocUsed: 152496 kB          <- Total size of Vmalloc memory area in used.
VmallocChunk: 349128 kB         <- Total size of free Vmalloc memory area.

Refer to the Linux documentation for more details:  proc.txt  -> search for '/proc/meminfo'.

Note:

Super Admin privilege is required to run the 'fnsysctl' command. Otherwise, FortiGate will return an error, as explained in this KB article: Troubleshooting Tip: fnsysctl command returns Unknown action 0