Thanks for the response. I have the images as .img in the web server which is external to OpenStack nodes. But while I create the image in Horizon, I set the format to QCOW2. So once th image is created it shows as QCOW2. Then the instance is launched from this QCOW2 image.
Do you mean that I original image should also be QCOW2? I will also try the settings which you recommended. Regards, Balu On Tue, Mar 5, 2013 at 4:50 PM, Pádraig Brady <p...@draigbrady.com> wrote: > 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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