Home » VMware » 2V0-621 v.2 » Which two statements explain the behavior of virtual machine 9 and virtual machine 10?
An administrator notices that 8 out of 10 virtual machines have memory ballooning and swapping. However, virtual machine 9 is not ballooning or swapping and virtual machine 10 is not ballooning but is swapping.
Which two statements explain the behavior of virtual machine 9 and virtual machine 10? (Choose two.)
A. Virtual machine 9 has a 100% memory reservation.
B. Virtual machine 10 has a memory limit configured.
C. Virtual machine 9 has memory shares set to HIGH.
D. Virtual machine 10 does not have VMware Tools enabled or installed.
Correct Answer: AD
Explanation/Reference:
Explanation:
If the memory usage value is high, and the host has high ballooning or swapping, check the amount of free physical memory on the host. A free memory value of 6% or less indicates that the host cannot handle the demand for memory. This leads to memory reclamation, which might degrade performance.
If the host has enough free memory, check the resource shares, reservation, and limit settings of the virtual machines and resource pools on the host.
Verify that the host settings are adequate and not lower than those set for the virtual machines.
D-) Verify that VMware Tools is installed on each virtual machine. The balloon driver is installed with VMware Tools and is critical to performance. If Vmware tools are not installed/outdated showing on summary tab Ballooning will not work hence swapping will work because it has nothing to do with ballooning.
Fact: If memory is not available the memory can med mapped to the .vswp file on a vmfs or nfs datastore. The virtual machine has no knowledge if the memory is mapped to physical memory or to a disk. This is called hypervisor swapping, and this is the last resort for the vmkernel to use this mechanism.(Internal vmware KB article but for external you may check VMBlog or external links: https://kb.vmware.com/selfservice/microsites/ search.do?language=en_US&cmd=displayKC&externalId=1003470)