Dear engineers:
Is there an elegant way to copy an RBD volume to another Ceph cluster? I calculate the convert time with qemu-img 2.5 version or qemu-img 6.0 version, by copying a volume(capability is 2.5T and 18G only used) to another Ceph cluster. qemu-img [2.5 or 6.0] convert -p -f raw rbd:pool_1/volume-orig_id:id=cinder:conf=1_ceph.conf:keyring=1_ceph.client.cinder.keyring -O raw rbd:pool_2/volume-new_id:id=cinder:conf=2_ceph.conf:keyring=2_ceph.client.cinder.keyring [-n -m 16 -W -S 4k] Test qemu-img convert result: qemu-img 2.5 spend 2 hours and 40 minutes with no option parameter: qemu-img 6.0 spend 3 hours and 3 minutes with option parameter (-m 16 -W -S 4k): Questions: 1, why 2.5 version write only used disk capability(18G), but 6.0 version write the hole disk 2.5T? 2, how to use qemu-img (2.5 or 6.0 version) accelerating convert RBD volume to another Ceph cluster or there is some other ways to approach? This question in stack over flow but nobody can help me. The link:https://stackoverflow.com/questions/67000377/qemu-img-convert-rbd-volumes-between-different-ceph-clusters-accelerate Hope for your reply, THX. Yours Sincerely, Victor Lee
