I don't know of any technical limitations within QEMU (although most likely untested), but it definitely appears that libvirt restricts you to a file or block device. Note that we do have a librbd backlog item for built-in image migration [1] that would follow a similar approach as QEMU.
[1] https://trello.com/c/qAlIvwq8 On Fri, Oct 20, 2017 at 10:24 AM, Li Wang <laurence.liw...@gmail.com> wrote: > Hi， > We want to use the drive mirror provided by > qemu to mirror a local qemu image to a ceph > pool for backup, and vm migration. The usage > likes 'virsh blockcopy instance_id vda /cephfs/vm.qcow2', We have tested > CephFS, it woks. And we have done a simple try for kernel rbd, > namely, use '/dev/rbd0' instead of '/cephfs/vm.qcow2', it seems works too > (right?). > However, we think the most efficient way > with the shortest io path is to use qemu-rbd > driver, to not reach host kernel at all. We are > wondering if it is feasible, or need some > development? > > Cheers, > Li Wang > > 发自网易邮箱大师 > -- Jason
_______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
