Open Stack

Another option is to merge both Glance and Nova datadirs on GlusterFS in 
distributed/replicated array.
That way, all _base images and glance images are on the same 
"filesystem" but with distributed I/O.

-Sylvain

  Le 05/03/2013 13:10, Staicu Gabriel a écrit :
> Hi,
>
> As a rule of thumb how I worked around this issue was to add a new 
> hdd. I allocated this new hdd only to /var/lib/nova/instances/_base 
> and the other hdd to /var/lib/nova/instances/ so in this manner to the 
> first time a instance  is spawn on server the process use the full 
> capacity of a hdd.
>
> Regards,
> Gabriel
>
>
> ------------------------------------------------------------------------
> *From:* Pádraig Brady <P at draigBrady.com>
> *To:* Balamurugan V G <balamuruganvg at gmail.com>
> *Cc:* openstack at lists.launchpad.net
> *Sent:* Tuesday, March 5, 2013 1:20 PM
> *Subject:* Re: [Openstack] [OpenStack] How to speed up the instance 
> launch time?
>
> On 03/05/2013 11:03 AM, Balamurugan V G wrote:
> > Hi,
> >
> > I have a Folsom 2012.2 3 nodes setup like the one specified at 
> https://github.com/mseknibilel/OpenStack-Folsom-Install-guide/blob/master/OpenStack_Folsom_Install_Guide_WebVersion.rst. 
> Each node has a 1Tb hard disk with no raid.
> >
> > Be it the image creation or the Instance creation, takes a long 
> time(factor of the disk size of the image), about 15mins for a 20gb 
> image. I can understand the slow image creation due to the http 
> transfer of the file from a seperate web server hosting my images to 
> the controller node. But even the instance creation takes that much or 
> even a bit longer. I see that the image is copied from the Controller 
> to Compute node and multiple copies are make in the compute node. So 
> all this takes long an dis proportional to the image size. Is there 
> any way to speed up this process? Is a SAN based backend the only way 
> to go?
>
> It sounds like you're using raw images throughout?
> You might consider using qcow2 images in glance.
> Then you can avoid the conversion to raw in the libvirt base
> directory by setting force_raw_images=False in nova.conf
> That will avoid some of the initial caching penalty.
>
> Ensuring that you have use_cow_images=True set,
> with use CoW images for the instances and improve
> instance startup latency.
>
> Details of the operations and tradeoffs involved are at:
> http://www.pixelbeat.org/docs/openstack_libvirt_images/
>
> thanks,
> Pádraig.
>
>
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