Open Stack

Hello Everyone,
 
I am looking for evacuation support in openstack. 

>From what I could find, there are following two commands:

1. nova evacuate evacuated_server_name host_b --on-shared-storage 

2. nova host-evacuate command

However, both seem to have some downtime.

What I looking for is something like:

1. Host is put in a state, like maintenance mode, so that no new VMs are 
provisioned on it. 

2. Do a live migration from this source host to any host chosen by the 
scheduler.

This way, there won't be a downtime for the VMs and the host can be 
removed / brought down for maintenance. 

Apparently, "nova host-update" --maintenance provides the functionality I 
am looking for, however, it is only supported for Xen and unimplemented 
for KVM due to libvirt limitation.

Is there a way to work it around for KVM ..?


Regards,
Ashish
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