Re: Ceph + Libvirt + QEMU-KVM

[Zoltan Arnold Nagy <zoltan@xxxxxxxxxxxxxxxxxx>]

This has recently been fixed and will be available in Mitaka (after a lot of people fighting this for years).

Details: https://review.openstack.org/#/c/205282/

On 28 Jan 2016, at 12:09, 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 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 <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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