As far as i know, snapshotting with qemu will download a copy of the image on local storage and then upload it into ceph. At least this is the default behaviour when taking a snapshot in openstack of a running instance. I don't see why it would be any different with qemu-kvm. You must use the rbd snap feature to make a copy on write clone of the image. On 28 Jan 2016 12:59, "Bill WONG" <[email protected]> wrote:
> Hi Simon, > > how you manage to preform snapshot with the raw format in qemu-kvm VMs? > and i found some issues with libvirt virsh commands with ceph: > -- > 1) create storage pool with ceph via virsh > 2) create a vol via virsh - virsh vol-create-as rbdpool VM1 100G > > problem is here.. if we directly create vol via qemu-img create -f rbd > rbd:rbdpool/VM1 100G, then virsh is unable to find the vol. - virsh > vol-list rbdpool command is unable to list the vol, it looks such commands > - rbd, virsh and qemu-img creating images are not synced with each other... > > cloud you please let me know how you use the ceph as backend storage of > qemu-kvm, as if i google it, most of the ceph application is used for > OpenStack, but not simply pure qemu-kvm. as if setting up Glnace and Cinder > is troublesome... > > thank you! > > > On Thu, Jan 28, 2016 at 5:23 PM, Simon Ironside <[email protected]> > wrote: > >> On 28/01/16 08:30, Bill WONG wrote: >> >> without having qcow2, the qemu-kvm cannot make snapshot and other >>> features.... anyone have ideas or experiences on this? >>> thank you! >>> >> >> I'm using raw too and create snapshots using "rbd snap create" >> >> Cheers, >> Simon >> > > > _______________________________________________ > ceph-users mailing list > [email protected] > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > >
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