10:15 a.m.
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(a)ovirt.org on behalf of Markus Stockhausen"
<users-bounces(a)ovirt.org on behalf of stockhausen(a)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
2:39 p.m.
New subject: stalls during live Merge Centos 7 / qemu 2.3
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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 high=
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_l=
ock_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 Stockhaus=
en" <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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