hi Steffen, you meant the live VM migration with ceph disk? and this should be discussed on qemu-kvm list, and i have tested, it works fine.
ceph have the rbd snap, we can use it, but some qemu-kvm features which we developed are based on qemu snapshots, so required qcow2 or qemu snapshot.. . On Fri, Jan 29, 2016 at 2:01 AM, Steffen Weißgerber <[email protected]> wrote: > > > >>> Bill WONG <[email protected]> schrieb am Donnerstag, 28. Januar > 2016 um > 09:30: > > Hi Marius, > > > > Hello, > > > with ceph rdb, it looks can support qcow2 as well as per its > document: - > > http://docs.ceph.com/docs/master/rbd/qemu-rbd/ > > -- > > Important The raw data format is really the only sensible format > option to > > use with RBD. Technically, you could use other QEMU-supported formats > (such > > as qcow2 or vmdk), but doing so would add additional overhead, and > would > > also render the volume unsafe for virtual machine live migration > when > > caching (see below) is enabled. > > Normally my question would be off topic in this list, but I asked it > already in the qemu list > and got no answer: > > Is there documentation available on how to do live migration on rbd > disks > with the qemu-monitor? > > > --- > > > > without having qcow2, the qemu-kvm cannot make snapshot and other > > features.... anyone have ideas or experiences on this? > > thank you! > > > > Why using qemu snapshots when rbd-snapshots are available? > > Regards > > Steffen > > > > > On Thu, Jan 28, 2016 at 3:54 PM, Marius Vaitiekunas < > > [email protected]> wrote: > > > >> Hi, > >> > >> With ceph rbd you should use raw image format. As i know qcow2 is > not > >> supported. > >> > >> On Thu, Jan 28, 2016 at 6:21 AM, Bill WONG <[email protected]> > wrote: > >> > >>> Hi Simon, > >>> > >>> i have installed ceph package into the compute node, but it looks > qcow2 > >>> format is unable to create.. it show error with : Could not write > qcow2 > >>> header: Invalid argument > >>> > >>> --- > >>> qemu-img create -f qcow2 rbd:storage1/CentOS7-3 10G > >>> Formatting 'rbd:storage1/CentOS7-3', fmt=qcow2 size=10737418240 > >>> encryption=off cluster_size=65536 lazy_refcounts=off > refcount_bits=16 > >>> qemu-img: rbd:storage1/CentOS7-3: Could not write qcow2 header: > Invalid > >>> argument > >>> --- > >>> > >>> any ideas? > >>> thank you! > >>> > >>> On Thu, Jan 28, 2016 at 1:01 AM, Simon Ironside > <[email protected]> > >>> wrote: > >>> > >>>> On 27/01/16 16:51, Bill WONG wrote: > >>>> > >>>> i have ceph cluster and KVM in different machine.... the qemu-kvm > >>>>> (CentOS7) is dedicated compute node installed with qemu-kvm + > libvirtd > >>>>> only, there should be no /etc/ceph/ceph.conf > >>>>> > >>>> > >>>> Likewise, my compute nodes are separate machines from the > OSDs/monitors > >>>> but the compute nodes still have the ceph package installed and > >>>> /etc/ceph/ceph.conf present. They just aren't running any ceph > daemons. > >>>> > >>>> I give the compute nodes their own ceph key with write access to > the > >>>> pool for VM storage and read access to the monitors. I can then > use ceph > >>>> status, rbd create, qemu-img etc directly on the compute nodes. > >>>> > >>>> Cheers, > >>>> Simon. > >>>> > >>> > >>> > >>> _______________________________________________ > >>> ceph-users mailing list > >>> [email protected] > >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > >>> > >>> > >> > >> > >> -- > >> Marius Vaitiek*nas > >> > > -- > Klinik-Service Neubrandenburg GmbH > Allendestr. 30, 17036 Neubrandenburg > Amtsgericht Neubrandenburg, HRB 2457 > Geschaeftsfuehrerin: Gudrun Kappich > _______________________________________________ > ceph-users mailing list > [email protected] > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >
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