andrijapanicsb commented on a change in pull request #139:
URL:
https://github.com/apache/cloudstack-documentation/pull/139#discussion_r440966161
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File path: source/adminguide/virtual_machines/unmanage_vms.rst
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@@ -0,0 +1,81 @@
+About Unmanaged Virtual Machines
+--------------------------------
+
+As of ACS 4.14, CloudStack has the concept of **unmanaged** virtual machines.
These are virtual machines that are on CloudStack
+managed hosts, but that are not in CloudStack's database and therefore
CloudStack cannot control (manage) then in any way. Previously,
+such VMs could exist, but CloudStack did not 'see' them (their existence
*would* be reported in logs as unrecognised VMs).
+
+From ACS 4.14 onwards, CloudStack is able to list these VMs via the
listUnmanagedInstances API command and then import (also known as ingest)
+those unmanaged VMs via the importUnmanagedInstance API so that they become
CloudStack managed guest instances
+
+From ACS 4.15 onwards, administrators are able to unmanage guest virtual
machines.
+
+.. note:: This is currently only available for **vSphere** clusters.
+
+Unmanaging Virtual Machines via API
+-----------------------------------
+
+Administrators are able to unmanage guest virtual machines from CloudStack.
Once unmanaged, CloudStack can no longer monitor, control or administer the
provisioning and orchestration related operations on a virtual machine.
+
+To unmanage a guest virtual machine, an administrator must invoke the
unmnageVirtualMachine API passing the ID of the virtual machine to unmanage.
The API has the following preconditions:
+
+- The virtual machine must not be destroyed
+- The virtual machine state must be 'Running’ or ‘Stopped’
+- The virtual machine must be a VMware virtual machine
+
+The API execution will perform the following pre-checks, failing if they are
not met:
+
+- There are no volume snapshots associated with any of the virtual machine
volumes
+- There is no ISO attached to the virtual machine
+
+.. note:: This is currently only available for **vSphere** clusters.
+
+
+Preserving unmanaged virtual machine NICS
Review comment:
```suggestion
Preserving unmanaged virtual machine NICs
```
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