[ovirt-users] oVirt 4.1 upgrade hosted-engine

Hi! I have a two nodes (A and B), and running vm HostedEngine on host A. After upgrade host B to latest release CentOS (7.5.1804), i trying to upgrade host A, but i cannot migrate HostedEngine to host B for next upgrade CentOS. Another VMs migrated to Host B w/o problems. In logs on host A i have following lines: May 17 12:58:16 ovirt-h1 libvirtd: 2018-05-17 07:58:16.728+0000: 3637: error : virNetClientProgramDispatchError:177 : internal error: cannot execute command QEMU «cont»: Failed to lock byte 100 May 17 12:58:38 ovirt-h1 journal: ovirt-ha-agent ovirt_hosted_engine_ha.agent.hosted_engine.HostedEngine ERROR Migration failed: {u'status': {'message': 'Done', 'code': 0}, u'progress': 100} Please explain me what is my mistake? P.S I found, that host B have a missmatch in version of packages: # rpm -aq|grep qemu|sort -n centos-release-qemu-ev-1.0-2.el7.noarch ipxe-roms-qemu-20170123-1.git4e85b27.el7_4.1.noarch libvirt-daemon-driver-qemu-3.9.0-14.el7_5.2.x86_64 qemu-img-ev-2.10.0-21.el7_5.2.1.x86_64 qemu-kvm-common-ev-2.10.0-21.el7_5.2.1.x86_64 qemu-kvm-ev-2.10.0-21.el7_5.2.1.x86_64 qemu-kvm-tools-ev-2.9.0-16.el7_4.14.1.x86_64 Package qemu-kvm-tools-ev has version 2.9.0, while another packages of qemu has 2.10 version. Thank you so much for response.