We have a vsphere cluster and we are trying to setup monitoring via Foglight to monitor memory usage at the Guest level.
However, there are inconsistencies in reporting metrics.. most likely due to lack of knowledge.
These systems run SAP and are all running Red Hat Linux
top on a single server returns 10GB used memory. When looking in Foglight it shows active memory is only ~2-3gb.
Can someone explain why top would read more usage than Foglight, and vice versa?