Hi Mihai, it looks rather strange in ceph snapshot, the size of snapshot is bigger than the size of original images.. Original Image actual used size is 684M w/ provisioned 20G but the snapshot actual used size is ~18G w/ provisioned 20G
any ideas? == [root@compute2 ~]# rbd du CentOS3 -p storage1 warning: fast-diff map is not enabled for CentOS3. operation may be slow. NAME PROVISIONED USED CentOS3 20480M 684M [root@compute2 ~]# rbd du CentOS3@snap1 -p storage1 warning: fast-diff map is not enabled for CentOS3. operation may be slow. NAME PROVISIONED USED CentOS3@snap1 20480M 18124M == qemu-img info rbd:storage1/CentOS3 image: rbd:storage1/CentOS3 file format: raw virtual size: 20G (21474836480 bytes) disk size: unavailable cluster_size: 4194304 Snapshot list: ID TAG VM SIZE DATE VM CLOCK snap1 snap1 20G 1970-01-01 08:00:00 00:00:00.000 On Thu, Jan 28, 2016 at 7:09 PM, Mihai Gheorghe <[email protected]> wrote: > 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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