systemvm: vmware migration changes (apache#170)

* systemvm: vmware migration changes

Signed-off-by: Abhishek Kumar <abhishek.mrt22@gmail.com>

* refactor systemvm storage migration note

Co-authored-by: Andrija Panic <45762285+andrijapanicsb@users.noreply.github.com>

Co-authored-by: Andrija Panic <45762285+andrijapanicsb@users.noreply.github.com>

Author: 2 people

source/adminguide/systemvm.rst

@@ -812,6 +812,13 @@ The administrator can log in to the secondary storage VM if needed.
 .. |vr-upgrade.png| image:: /_static/images/vr-upgrade.png
    :alt: Button to upgrade VR to use the new template.
 
+Migrating System VMs
+--------------------
+
+System VMs (any of the Console Proxy VM, Secondary Storage VM, Virtual Router or Load Balancer) can be migrated across hosts using migrateSysteVm API or migrate action in the UI. These VMs can be migrated between hosts of the same cluster only.
+
+Since CloudStack 4.16, for VMware, migration of System VMs can also be done to a destination host in a different cluster belonging to the same pod (in case of cluster-wide primary storage pools, this will cause the Root volume of the system VM to be migrated to the appropriate datastore in the new cluster). Storage migration of stopped System VMs is also supported.
+
 Troubleshoot networks from System VMs
 -------------------------------------
 .. |run-diagnostics-icon.png| image:: /_static/images/run-diagnostics-icon.png