Since we're talking snapshots, quick doc-related snapshot questions: - Are snapshots only supported on qemu/kvm, or do they work with other hypervisors as well? (Does Xen support qcow2 images?)
- Does OpenStack do anything with snapshots other than using them to generate new images? I was a little confused by the existence of the "Snapshots" pane in Diablo Horizon. I originally thought snapshotting was just a qemu/kvm implementation detail about how nova created a new image from a running instance, so I didn't understand why there was a "Snapshots" pane in addition to an "Images" pane. Take care, Lorin -- Lorin Hochstein Lead Architect - Cloud Services Nimbis Services, Inc. www.nimbisservices.com On Apr 25, 2012, at 1:55 AM, Vishvananda Ishaya wrote: > ? > > Did you mistype your comment or misread mine? Raw does NOT work for > snapshots. snapshots only work for qcow2. Implementing snapshotting with raw > would be possible. Logic just needs to be added to skip the internal snapshot > step and just use the entire file when uploading to glance. This would be > pretty darn slow for large images though. > > If you are asking about differencing images in glance that is a different > question and one that we haven't addressed. It has a lot of implications and > needs changes in both nova and glance to be useful. Logic needs to be added > around dependency chains and coalescing. Plus it has implications when trying > to migrate and resize instances, so there is a lot to consider. > > As caitlin mentioned, something will be implemented in the volume service > anyway, so it might be better to wait and see what happens there. > > Vish > > On Apr 24, 2012, at 4:30 PM, Joshua Harlow wrote: > >> What changes would be needed to make qcow2 files work as snapshots? >> Some type of image “dependency” management in glance (and failure cases) and >> the corresponding “dependency” fetching in nova (and failure cases)? >> Might be something pretty useful to have, instead of forcing raw for >> snapshots? >> >> On 4/24/12 3:51 PM, "Vishvananda Ishaya" <vishvana...@gmail.com> wrote: >> >> On Apr 17, 2012, at 2:04 AM, William Herry wrote: >> >> > so, what changes should I make if I want use raw in openstack, I didn't >> > find some configure option in nova.conf.sample >> > >> > I also try to modify the source code in nova/virt/libvirt/utils.py, and >> > didn't succeed >> > >> > I noticed that the type of snapshot is same as the instance's image by >> > default, does this right, and what about the type of model image that >> > uploaded to glance, does it affect the disk type I use? >> > >> > Thanks >> >> snapshots will not work with raw images. To make openstack use raw images, >> you simply have to set: >> >> use_cow_images=false >> >> you can upload to glance in qcow or raw, it will be decoded to raw when the >> image is downloaded to the compute host. >> >> Vish >> >> >> _______________________________________________ >> Mailing list: https://launchpad.net/~openstack >> Post to : openstack@lists.launchpad.net >> Unsubscribe : https://launchpad.net/~openstack >> More help : https://help.launchpad.net/ListHelp >> > > _______________________________________________ > Mailing list: https://launchpad.net/~openstack > Post to : openstack@lists.launchpad.net > Unsubscribe : https://launchpad.net/~openstack > More help : https://help.launchpad.net/ListHelp
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