[Openstack-operators] Starting large VMs takes quite long

Diego Parrilla diego.parrilla at stackops.com
Wed Oct 19 16:39:36 UTC 2011


my answers below,

On Wed, Oct 19, 2011 at 6:04 PM, Till Mossakowski
<Till.Mossakowski at dfki.de>wrote:

> Hi,
> I have set up openstack using stackops.

Good choice ;-)

> I have installed one controller node and one compute node (each using two
> 1GBit NICs), following the book "Deploying Openstack".
> I am using nova-objectstore for storing images.
> Now starting a machine with a 5G image takes quite a while, probably
> because the image is mounted via nfs to the compute node.

5GB image it's not too big... we use NFS to share instances among nodes to
help with the live migration and performance it's acceptable. How much is
'quite a while' in seconds?

> With libvirt, I am used to start VMs instantly. Is there a way to do the
> same with openstack? The image would need to be stored directly on the
> compute node, of course. Ideally, in a network with more nodes, the lots of
> images I have would be distributed to compute nodes in advance, and a
> special scheduler would select a compute node holding the needed image. Is
> this possible with openstack?

If you share the /var/lib/nova/instances with NFS, during the 'launch'
process the base virtual image is copied to '_base'. Depending on the size
of this file it will take longer. Once it's copied next time you use this
image it should go much faster.

Note: I have tested right now with a 1Gb launching a >25GB Windows VM and it
took 3-4 minutes the first time. New Windows images, it took only a few

> Best,
> Till
> --
> Prof. Dr. Till Mossakowski  Cartesium, room 2.51 Phone +49-421-218-64226
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Diego Parrilla
*www.stackops.com | * diego.parrilla at stackops.com** | +34 649 94 43 29 |
* <http://www.stackops.com/>


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