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
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 <mcapsali@xxxxxxxxx> 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" <wongahshuen@xxxxxxxxx> 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 virsh2) 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 <sironside@xxxxxxxxxxxxx> 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
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