vm,metrics: note about behaviour across hypervisors (#413)
* vm,metrics: note about behaviour across hypervisors
* add statement
Signed-off-by: Abhishek Kumar <abhishek.mrt22@gmail.com>
diff --git a/source/adminguide/virtual_machines.rst b/source/adminguide/virtual_machines.rst
index 5a93a54..468ec2c 100644
--- a/source/adminguide/virtual_machines.rst
+++ b/source/adminguide/virtual_machines.rst
@@ -1505,6 +1505,17 @@
|vm-disk-metrics-ui.png|
+
+.. note::
+ The metrics or statistics for VMs and VM disks in CloudStack depend on the
+ hypervisor plugin used for each hypervisor. The behavior can vary across
+ different hypervisors. For instance, with KVM, metrics are real-time
+ statistics provided by libvirt. In contrast, with VMware, the metrics are
+ averaged data based on the global configuration parameter
+ `vmware.stats.time.window` and a lower value for the configuration may help
+ observe statistics closer to the real-time values.
+
+
.. |vm-lifecycle.png| image:: /_static/images/vm-lifecycle.png
:alt: Instance State Model
.. |vm-schedule-tab.png| image:: /_static/images/vm-schedule-tab.png
