[ovirt-users] stalls during live Merge Centos 7 / qemu 2.3

[Markus Stockhausen]

> Von: Pavel Gashev [Pax at acronis.com]
> Gesendet: Dienstag, 12. April 2016 16:15
> An: Markus Stockhausen; users
> Betreff: Re: [ovirt-users] stalls during live Merge Centos 7 / qemu 2.3
> 
> 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 ?

Hi Pavel. 

thanks for your response. I dont even need high disk load to 
reproduce the issue. Just a simple script that writes 8k blocks
every 0.5 secs.  I added the required info to the BZ.

https://bugzilla.redhat.com/show_bug.cgi?id=1319400

Markus

> 
> 
> On 11/04/16 18:13, "users-bounces at ovirt.org on behalf of Markus Stockhausen" <users-bounces at ovirt.org on behalf of stockhausen at 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
> >
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