Open Stack

Hi,

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
seconds.


>
> Best,
> Till
>
> --
> Prof. Dr. Till Mossakowski  Cartesium, room 2.51 Phone +49-421-218-64226
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