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Hi Pavel,=0A=
=0A=
I tested as advised. And aaaaaaargh hit the next two OVirt bugs....=0A=
=0A=
https://bugzilla.redhat.com/show_bug.cgi?id=3D1326900=0A=
=0A=
Nevertheless: Merging only one disk at once works as expected.=0A=
The VM stays up, keeps running and is responsive.=0A=
=0A=
Markus=0A=
________________________________________=0A=
Von: Pavel Gashev [Pax(a)acronis.com]=0A=
Gesendet: Mittwoch, 13. April 2016 15:12=0A=
An: Markus Stockhausen; users=0A=
Betreff: Re: AW: [ovirt-users] stalls during live Merge Centos 7 / qemu 2.3=
=0A=
=0A=
Markus,=0A=
=0A=
So all CPU threads are blocked by the main loop. The main loop is busy drai=
ning IO requests from all drives while there are other block commit jobs ac=
tive... It looks like currently QEMU just can't live merge more than one dr=
ive simultaneously without blocking VCPUs.=0A=
=0A=
As workaround you can delete disk snapshots one-by-one, and then delete dis=
k-less VM snapshot. The Storage tab has Disk Snapshots sub tab where you ca=
n remove a specific snapshot of a specific disk.=0A=
=0A=
=0A=
=0A=
=0A=
=0A=
On 12/04/16 21:39, "Markus Stockhausen" <stockhausen(a)collogia.de>
wrote:=0A=
=0A=
> Von: Pavel Gashev [Pax(a)acronis.com]=0A=
> Gesendet: Dienstag, 12. April 2016 16:15=0A=
> An: Markus Stockhausen; users=0A=
> Betreff: Re: [ovirt-users] stalls during live Merge Centos 7 / qemu 2.3=
=0A=
>=0A=
> Markus,=0A=
>=0A=
> I saw similar issues. Looks like it's related to multidisk VMs under hig=
h
disk load. No relations with guest OS. No relations with IO threads.=0A=
>=0A=
>=0A=
> I didn't debug it. Can you please show a backtrace of a thread in __lll_=
lock_wait ?=0A=
=0A=
Hi Pavel.=0A=
=0A=
thanks for your response. I dont even need high disk load to=0A=
reproduce the issue. Just a simple script that writes 8k blocks=0A=
every 0.5 secs. I added the required info to the BZ.=0A=
=0A=
https://bugzilla.redhat.com/show_bug.cgi?id=3D1319400=0A=
=0A=
Markus=0A=
=0A=
>=0A=
>=0A=
> On 11/04/16 18:13, "users-bounces(a)ovirt.org on behalf of Markus Stockhau=
sen" <users-bounces(a)ovirt.org on behalf of stockhausen(a)collogia.de>
wrote:=
=0A=
>=0A=
> >Hi there,=0A=
> >=0A=
> >I'm getting slowly mad about our new Centos 7 cluster. Whenever=0A=
> >I start a live merge the machine completely freezes. It seems to be=0A=
> >independent of the Guest OS (tried SLES 11 SP3, SLES11 SP4 and=0A=
> >SLES12). I already opened BZ1319400 because I'm clueless.=0A=
> >=0A=
> >Doing the same in our Fedora 20 cluster (qemu 2.1.3) we only see=0A=
> >small hiccups of 1-3 seconds at the start of the live merge but no=0A=
> >complete stall. Its the same VM!=0A=
> >=0A=
> >Just to be sure that it is not a specific problem of our topology=0A=
> >or SLES I would like to receive some feedback of the list if anyone=0A=
> >observes similar lockups in their environment.=0A=
> >=0A=
> >Thanks in advance.=0A=
> >=0A=
> >Markus=0A=
> >=0A=
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