[VCSA 6.5] Understanding memory usage

[SamBall]

Hello everybody,

I want to monitor the VCSA using SNMP agent and i don't understand the results :

- In the VCSA (vcsa.png)

- With vimtop :

Memory:	16423592KB total	8728016KB used	558404KB free	605092KB buffs
Swap:	27254776KB total	52264KB used	27202512KB free	6532080KB cached
Vmalloc:	33554431MB total	0MB used	33554431MB free	0MB chunk

- In vCenter (vcenter.png)

- With SNMP : Storage 'Real Memory' Usage Total: 15.66 GB Used: 15.12 GB (96.56%) Free: 551.99 MB (3.44%)

I'm not very familiar with linux RAM usage, but it seem me that we have "active memory" or something like that ?

What metric is relevant to use ?

Thank you

Sam

[MNarubin]

Hello, we have the same problem with VCSA 6.5, the different memory usage in SNMP and vimtop/monitor tools.

From SNMP agent we have 99% memory utilization and from vimtop / Appliance Management tools ~75-80%...
Also vimtop displayed incorrect free memory value. Check screenshot in attache:

Total 10230396 KB

Used 7261920 KB

Free 153496 KB

10230396 - 7261920 = 2968476 and this value is not equal to 153496 KB of displayed free memory in vimtop.