Which performance counter will confirm the need to add more physical memory in the VMware
ESXi 5 host?

A.
Memory swap in

B.
Memory balloon

C.
Memory ready

D.
Kernel swap in

Explanation:

Reference: http://searchsystemschannel.techtarget.com/feature/Monitoring-vSphere-CPU-andmemory-usage (monitoring memory usage, 8th bulleted point)
These counters, in particular the Memory Swap Used (Average) counter, will give you an idea of
whether the ESX/ESXi host is under memory pressure. If the ESX/ESXi host is not suffering from
memory pressure and you still suspect a memory problem, then the issue likely lies with the virtual
machine.