>>> Bill WONG <wongahshuen@xxxxxxxxx> 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 < > mariusvaitiekunas@xxxxxxxxx> 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 <wongahshuen@xxxxxxxxx> 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 <sironside@xxxxxxxxxxxxx> >>> 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 >>> ceph-users@xxxxxxxxxxxxxx >>> 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 ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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