Markus, I saw similar issues. Looks like it's related to multidisk VMs under high disk load. No relations with guest OS. No relations with IO threads. I didn't debug it. Can you please show a backtrace of a thread in __lll_lock_wait ? On 11/04/16 18:13, "users-bounces@ovirt.org on behalf of Markus Stockhausen" <users-bounces@ovirt.org on behalf of stockhausen@collogia.de> wrote:
Hi there,
I'm getting slowly mad about our new Centos 7 cluster. Whenever I start a live merge the machine completely freezes. It seems to be independent of the Guest OS (tried SLES 11 SP3, SLES11 SP4 and SLES12). I already opened BZ1319400 because I'm clueless.
Doing the same in our Fedora 20 cluster (qemu 2.1.3) we only see small hiccups of 1-3 seconds at the start of the live merge but no complete stall. Its the same VM!
Just to be sure that it is not a specific problem of our topology or SLES I would like to receive some feedback of the list if anyone observes similar lockups in their environment.
Thanks in advance.
Markus