Did you see any errors in the gluster mount logs during the time when the VMs were frozen ( I assume the I/O not responding during this time?) . There have been bugs fixed around concurrent I/O on gluster volume and vm's pausing in 3.7.12 - the mount logs can tell us if you ran into similar issue. On 07/08/2016 03:58 PM, bertjan wrote:
Hi Michal,
That's right. I put it in maintenance mode, so there were no VMs.
The frozen VMs were on the other hosts. That's wat makes it strange and why it doesn't give me a good feeling. When someone can say 'I know the issue and it is fixed with gluster version 3.7.12', I would feel more reassured about it...
Regards,
Bertjan
On Fri, Jul 08, 2016 at 12:23:21PM +0200, Michal Skrivanek wrote:
On 08 Jul 2016, at 12:06, bertjan <b.j.goorkate@umcutrecht.nl> wrote:
Hi,
I have a 3-node CentOS7 based oVirt+replica-3 gluster environment with an engine on dedicated hardware.
After putting the first vm-host into maintenance mode to update it from vdsm-4.17.28-1 to vdsm-4.17.32-0 and from glusterfs-3.7.11-1 to glusterfs-3.7.12-2 (among others), random VMs froze (not pauzed. oVirt showed them as 'up') until the update was done and the vm-host was rebooted and active again. I suppose the host you were updating at that time had no running VMs, right? If so, then indeed perhaps a gluster issue
After all the vm-hosts were upgraded, I never experienced the problem again. Can this be a bug, fixed with the upgrade to glusterfs-3.7.12-2?
Has anyone experienced the same problem?
Thanks in advance! (next week I'm not able to check my e-mail, so response can be delayed).
Regards,
Bertjan
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