Hello,

Sorry for my late response. I reproduced the error in a lab environment (oVirt3.5/CentOS7.1) with 2 hosts (ovhv00 ovhv01) and a replicated glusterfs. I activated the maintenance mode in host ovhv01 and then I stopped network.service (instead of a reboot). The result is always the same. Data Center becomes "Non Responsive", my storage becomes red and inactive, and most VMs become "paused due to unknown storage error".

This is the engine log
https://paste.fedoraproject.org/250877/58925314/raw/

Thanks,

K.



On 07/29/2015 12:21 PM, Artyom Lukianov wrote:
Can you please provide engine log(/var/log/ovirt-engine/engine.log)?

----- Original Message -----
From: "Konstantinos Christidis" <kochr...@ekt.gr>
To: users@ovirt.org
Cc: "Artyom Lukianov" <aluki...@redhat.com>
Sent: Wednesday, July 29, 2015 9:40:26 AM
Subject: Re: [ovirt-users] Data Center becomes Non Responsive when I reboot a   
host

Maintenance mode is already enabled. All VMs finish migration successfully.
Now I stop glusterd service on this host (systemctl stop
glusterd.service) and nothing bad happens, which means that distributed
replica glusterfs works fine.
Then I stop vdsmd service (systemctl stop vdsmd.service) and everything
works fine.
When I administratively set ovirtmgmt network down or reboot this host,
my Data Center becomes "Non Responsive", my storage becomes red and
inactive, and most VMs become "paused due to unknown storage error".

K.




On 07/28/2015 06:09 PM, Artyom Lukianov wrote:
Just put host to maintenance mode, if it have vms it will migrate them 
automatically on other host.

----- Original Message -----
From: "Konstantinos Christidis" <kochr...@ekt.gr>
To: users@ovirt.org
Sent: Tuesday, July 28, 2015 1:15:15 PM
Subject: [ovirt-users] Data Center becomes Non Responsive when I reboot a       
host

Hello ovirt users,

I have 4 hosts with a distributed replicated 2x2 GlusterFS storage.
(oVirt3.5/CentOS7)

When I reboot a host (in maintenance mode and not my SPM host) my Data
Center becomes "Non Responsive", my storage becomes red and inactive,
and many VMs become "paused due to unknown storage error". The same
happens if I administratively set ovirtmgmt network down (to a host in
maintenance mode and not my SPM host) with ifconfig ovirtmgmt down.
I know that management network (ovirtmgmt) is required by default and is
part of oVirt monitoring process but is there anything I can do in order
to reboot a host without causing this mess?

Thanks,

K.
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