Ping. I think Kei's suggestion below is a good one... can someone knowledgeable with qemu respond?
-jay On Tue, Jun 21, 2011 at 9:55 PM, <[email protected]> wrote: > Hello, > > I have a question about nova.virt.libvirt.connection.snapshot(). > In my understandings, this method is currently used for saving(cloning) VM > images and upload cloned image to Glance. > > Q1) Is there any reason why method name is snapshot() , not image_create or > image_save or something? > I am just wondering if there will be additional work to add VMWare-like > snapshotting(meaning taking snapshot many times, user can select one of them, > and VM state can get back...) > > Q2) In current implementation original disk size is bigger after nova > image-create. Please see below. > > [before image-create] > root@testhost:/opt/openstack/instances/instance-00000015# ls -l > total 151580 > -rw-r----- 1 libvirt-qemu kvm 2889 2011-06-23 11:53 console.log > -rw-r--r-- 1 libvirt-qemu kvm 155189248 2011-06-23 11:56 disk > -rw-r--r-- 1 libvirt-qemu kvm 6291968 2011-06-23 11:50 disk.local > -rw-r--r-- 1 root root 1728 2011-06-23 11:49 libvirt.xml > > [after image-create] > root@testhost:/opt/openstack/instances/instance-00000015# ls -l > total 3734664 > -rw-r----- 1 libvirt-qemu kvm 2889 2011-06-23 11:53 console.log > -rw-r--r-- 1 libvirt-qemu kvm 603979776 2011-06-23 13:02 disk > -rw-r--r-- 1 root root 197120 2011-06-23 12:11 disk.diff > -rw-r--r-- 1 libvirt-qemu kvm 10486272 2011-06-23 12:59 disk.local > -rw-r--r-- 1 root root 1728 2011-06-23 11:49 libvirt.xml > > That means if any sensitive users do "nova-image create", compute node > original image size is bigger and compute node disk size available is > decreasing. So I would like to ask, the below operation is inappropriate here? > a) taking diff backup: qemu-img create -b disk -f qcow2 disk.diff > b) convert : qemu-img convert -f -O qcow2 disk.diff new_img > > Disk size is not bigger this way. In addition, if --use_cow_image=False, this > way can be used. > Any opinion on this? If I misunderstand somehow, please let me know. > > Regards, > Kei > _______________________________________________ > Mailing list: https://launchpad.net/~openstack > Post to : [email protected] > Unsubscribe : https://launchpad.net/~openstack > More help : https://help.launchpad.net/ListHelp > _______________________________________________ Mailing list: https://launchpad.net/~openstack Post to : [email protected] Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
