On Jan 16, 2017 9:33 PM, "Markus Stockhausen" <stockhausen@collogia.de> wrote:
Hi there,

maybe i missed the discussion on the mailing list. Today we installed
a new centos host. Of course it has 7.3 and qemu 2.6 after a yum update.
It can be attached to our cluster wihtout problems. We are running Ovirt
4.0.6 but the cluster compatibility level is still 3.6.

We can migrate a VM from qemu 2.3 to 2.6
We cannot migrate a VM from qemu 2.6 to 2.3

What happens:

- qemu is started on the target host (centos 7.2)
- source qemu says: "initiating migration"
- dominfo on target gives:
Id:             21
Name:           testvm
UUID:           d2d8bdfd-99a6-41c0-84e7-26e1d6a6057b
OS Typ:         hvm
Status:         pausiert
CPU(s):         2
CPU-Zeit:       48,5s
Max Speicher:   8388608 KiB
Verwendeter Speicher: 8388608 KiB
Bleibend:       nein
Automatischer Start: deaktiviert
Verwaltete Sicherung: nein
Sicherheits-Modell: selinux
Sicherheits-DOI: 0
Sicherheitskennung: system_u:system_r:svirt_t:s0:c344,c836 (enforcing)

Anyone experienced this behaviour? Maybe desired?

It's not desired. 
VDSM logs from both sides may help. 
Y. 


Current software versions:

centos 7.2 host:
- libvirt 1.2.17-13.el7_2.6
- qemu 2.3.0-31.el7.21.1

centos 7.3 host:
- libvirt 2.0.0-10.el7_3.2
- qemu 2.6.0-27.1.el7

Ovirt engine
- ovirt 4.0.6

Thanks in advance.

Markus
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