On 03/05/2013 02:07 PM, Balamurugan V G wrote: > Thanks for the responses and the link to pixelbeat. Its very helpful. > > Start with QCOW, even before image is uploaded to Glance, dit help since the > image size camedown from 20Gb to 8+Gb. I even set the the > force_raw_images=False, and use_cow_images=True in nova.conf and restarted > nova services. I still see that the image is copied to _base and then copied > again to instances folder. This is probably expected and is the caching > feature. But under _base I see two files one with the underscore suffix and > one without. Does it mean that each time I launch an instance with a diferent > flavour(say disk set to 30Gb), another copy will be created in _base? > > root@openstack-kvm1:/var/lib/nova/instances# ls -l _base/ | grep > 2b4a8e97317619077645de369a8f9fd63acd1f05 > -rw-rw-r-- 1 nova nova 8691056640 Mar 5 19:23 > 2b4a8e97317619077645de369a8f9fd63acd1f05 > -rw-rw-r-- 1 libvirt-qemu kvm 8691056640 Mar 5 19:23 > 2b4a8e97317619077645de369a8f9fd63acd1f05_20
These files in base are only update once per source image / size combination. I.E. if you have 100 instances booted from a 20G flavor, you'll only have those 2 files cached on the first boot. Note there is a blueprint in place for precaching those too: https://blueprints.launchpad.net/nova/+spec/nova-image-cache-management-2 thanks, Pádraig. p.s. those _20 files will not be there for grizzly as the caching was adjusted there. _______________________________________________ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
