Re: [ovirt-users] 3.5 live merge findings and mysteries [was Re: Simple way to activate live merge in FC20 cluster]

Hi, please see below for more details. tl; dr; Live merge works on oVirt-3.5.0 with Fedora 20 hosts that are using qemu and libvirt packages from the virt-preview repo. No other configuration is supported yet. We aim to have support for RHEL7.1 and later and built-in support for Fedora 21. ----- Original Message ----- > > On Fri, Dec 12, 2014 at 4:32 PM, Itamar Heim < iheim(a)redhat.com > wrote: > > > On 11/21/2014 09:53 AM, Gianluca Cecchi wrote: > > > > So the official statement is this one at: > http://www.ovirt.org/OVirt_3. 5_Release_Notes > > Live Merge > If an image has one or more snapshots, oVirt 3.5's merge command will > combine the data of one volume into another. Live merges can be > performed with data is pulled from one snapshot into another snapshot. > The engine can merge multiple disks at the same time and each merge can > independently fail or succeed in each operation. > > I think we should remove the part above, or at least have some of the > developers to better clarify it. > The feature in my opinion is very important and crucial for oVirt/RHEV > because it is able to almost-fill the gap with VMware, especially in > development environments, where having flexibility on snapshots > management is very important and could be a starting point to have > greater user base familiarize with the product and adopt it. > > So these are my findings and all combinations and none of them was able > to provide live merge.... > Could anyone tell me where I'm failing? Or correct release notes? > > 1) Environment with All-In-One F20 > > installing oVirt AIO on F20 automatically gives the virt-preview repo > through the ovirt-3.5-dependencies.repo file, but only for libvirt* > packages: > > the same server is the engine and the hypervisor > > [root@tekkaman qemu]# rpm -q libvirt > libvirt-1.2.9.1-1.fc20.x86_64 > > [root@tekkaman qemu]# vdsClient -s 0 getVdsCaps | grep -i merge > liveMerge = 'true' > > but > [root@tekkaman qemu]# rpm -q qemu > qemu-1.6.2-10.fc20.x86_64 > > So that tryng live merge it initially start but you get this in vdsm.log: > libvirtError: unsupported configuration: active commit not supported > with this QEMU binary This is expected behavior. You also need to install the qemu packages from virt-preview to get the feature. > 2) Another seaparate environment with a dedicated 3.5 engine f20 engine > and 4 test cases tried > > a) ovirt node installed and put in a dedicated cluster > latest available seems ovirt-node-iso-3.5.0.ovirt35. 20140912.el6.iso > from 3.5 rc test days > > At the end of oVirt Node install and activation in engine: > [root@ovnode01 ~]# vdsClient -s 0 getVdsCaps | grep -i merge > liveMerge = 'false' > > [root@ovnode01 ~]# rpm -qa libvirt* qemu* > libvirt- 0.10.2-29 .el6_5.12.x86_64 > libvirt-lock-sanlock- 0.10.2-29 .el6_5. 12.x86_64 > libvirt-python- 0.10.2-29 .el6_5.12.x86_ 64 > qemu-kvm-tools- 0.12.1.2-2.415 .el6_5.14.x86_ 64 > qemu-kvm-rhev- 0.12.1.2-2.415 .el6_5.14.x86_64 > libvirt-client- 0.10.2-29 .el6_5.12.x86_ 64 > qemu-img-rhev- 0.12.1.2-2.415 .el6_5.14.x86_64 > Live merge is not supported on EL6, period. It was simply not possible to backport all of the features into those versions of qemu and libvirt. > > b) f20 + latest updates host installed as OS and then installed from > webadmin in another cluster > virt-preview on host it is not enabled so that libvirt/qemu are not ready > > > [root@ovnode02 network-scripts]# vdsClient -s 0 getVdsCaps | grep -i merge > liveMerge = 'false' > > [root@ovnode02 network-scripts]# rpm -qa libvirt* qemu* > libvirt-daemon-1.1.3.6-2.fc20. x86_64 > libvirt-python-1.1.3.6-2.fc20. x86_64 > libvirt-daemon-config- nwfilter-1.1.3.6-2.fc20.x86_64 > qemu-kvm-1.6.2-10.fc20.x86_64 > qemu-common-1.6.2-10.fc20.x86_ 64 > libvirt-client-1.1.3.6-2.fc20. x86_64 > libvirt-daemon-driver-network- 1.1.3.6-2.fc20.x86_64 > libvirt-daemon-driver- nwfilter-1.1.3.6-2.fc20.x86_64 > libvirt-daemon-driver- interface-1.1.3.6-2.fc20.x86_ 64 > libvirt-daemon-driver-nodedev- 1.1.3.6-2.fc20.x86_64 > libvirt-daemon-driver-secret- 1.1.3.6-2.fc20.x86_64 > qemu-system-x86-1.6.2-10.fc20. x86_64 > libvirt-daemon-kvm-1.1.3.6-2. fc20.x86_64 > qemu-kvm-tools-1.6.2-10.fc20. x86_64 > qemu-img-1.6.2-10.fc20.x86_64 > libvirt-daemon-driver-qemu-1. 1.3.6-2.fc20.x86_64 > libvirt-daemon-driver-storage- 1.1.3.6-2.fc20.x86_64 > libvirt-lock-sanlock-1.1.3.6- 2.fc20.x86_64 Great, this is working as expected. > c) CentOS 6.6 host + latest updates installed as OS and then installed > from webadmin in another cluster > > [root@ovnode03 ~]# vdsClient -s 0 getVdsCaps | grep -i merge > liveMerge = 'false' > > [root@ovnode03 ~]# rpm -qa libvirt* qemu* > libvirt-python- 0.10.2-46 .el6_6.2.x86_64 > qemu-kvm-rhev-tools- 0.12.1.2-2.415 .el6_5.14. x86_64 > qemu-img-rhev- 0.12.1.2-2.415 .el6_5.14.x86_64 > libvirt-client- 0.10.2-46 .el6_6.2.x86_64 > libvirt- 0.10.2-46 .el6_6.2.x86_64 > qemu-kvm-rhev- 0.12.1.2-2.415 .el6_5.14.x86_64 > libvirt-lock-sanlock- 0.10.2-46 .el6_6.2. x86_64 > Also expected due to specific lack of support for el6. > d) CentOS 7.0 host + latest updates installed as OS and then installed > from webadmin in another cluster > > [root@ovnode04 ~]# vdsClient -s 0 getVdsCaps | grep -i merge > liveMerge = 'false' > > [root@ovnode04 ~]# rpm -qa qemu* libvirt* > qemu-img-rhev-1.5.3-60.el7_0. 2.x86_64 > libvirt-daemon-1.1.1-29.el7_0. 3.x86_64 > libvirt-daemon-driver-storage- 1.1.1-29.el7_0.3.x86_64 > libvirt-daemon-driver-nodedev- 1.1.1-29.el7_0.3.x86_64 > libvirt-daemon-kvm-1.1.1-29. el7_0.3.x86_64 > qemu-kvm-tools-rhev-1.5.3-60. el7_0.2.x86_64 > qemu-kvm-common-rhev-1.5.3-60. el7_0.2.x86_64 > libvirt-client-1.1.1-29.el7_0. 3.x86_64 > libvirt-daemon-driver- nwfilter-1.1.1-29.el7_0.3.x86_ 64 > libvirt-daemon-driver- interface-1.1.1-29.el7_0.3. x86_64 > libvirt-lock-sanlock-1.1.1-29. el7_0.3.x86_64 > libvirt-daemon-config- nwfilter-1.1.1-29.el7_0.3.x86_ 64 > libvirt-daemon-driver-network- 1.1.1-29.el7_0.3.x86_64 > qemu-kvm-rhev-1.5.3-60.el7_0. 2.x86_64 > libvirt-python-1.1.1-29.el7_0. 3.x86_64 > libvirt-daemon-driver-secret- 1.1.1-29.el7_0.3.x86_64 > libvirt-daemon-driver-qemu-1. 1.1-29.el7_0.3.x86_64 el7 will not be supported until 7.1 is released.