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Thanks for your help.


> What was the starting value for MTU?
1500
> What was the starting value changed to for MTU?
9000
> Can ping between all your controllers?
yes, all container starts except nova-conductor, nova-scheduler, maraidb


> Do you just have two controllers running mariadb?
yes
> How did you change MTU?

On the 3 servers:
nmcli connection modify team0-port1 802-3-ethernet.mtu 9000
nmcli connection modify team1-port2 802-3-ethernet.mtu 9000
nmcli connection modify type team0 team.runner lack ethernet.mtu 9000
nmcli con down team0
nmcli con down team1


> Was the change reverted at the network level as well (switches need to be configured higher or at the same MTU value then the servers)
I didn’t change Mtu on network (switches) , but ping -s 10.0.5.117 (iscsi bay) was working from serv3.

I changed the value of the mtu because the creation of the volumes takes a lot of time I find (4 minutes for 20G, which is too long for what I want to do, the patience of the students decreases with the years)

Franck

> Le 4 févr. 2022 à 23:12, Laurent Dumont <laurentfdumont at gmail.com> a écrit :
> 
> What was the starting value for MTU?
> What was the starting value changed to for MTU?
> Can ping between all your controllers?
> Do you just have two controllers running mariadb?
> How did you change MTU?
> Was the change reverted at the network level as well (switches need to be configured higher or at the same MTU value then the servers)
> 4567 seems to be the port for galera (clustering for mariadb) <>
> On Fri, Feb 4, 2022 at 11:52 AM Franck VEDEL <franck.vedel at univ-grenoble-alpes.fr <mailto:franck.vedel at univ-grenoble-alpes.fr>> wrote:
> Hello,
> I am in an emergency situation, quite catastrophic situation because I do not know what to do.
> 
> I have an Openstack cluster with 3 servers (serv1, serv2, serv3). He was doing so well…
> 
> 
> A network admin came to me and told me to change an MTU on the cards. I knew it shouldn't be done...I shouldn't have done it.
> I did it.
> Of course, it didn't work as expected. I went back to my starting configuration and there I have a big problem with mariadb which is set up on serv1 and serv2.
> 
> Here are my errors:
> 
> 
> 2022-02-04 17:40:36 0 [ERROR] WSREP: failed to open gcomm backend connection: 110: failed to reach primary view: 110 (Connection timed out)
> 	 at gcomm/src/pc.cpp:connect():160
> 2022-02-04 17:40:36 0 [ERROR] WSREP: gcs/src/gcs_core.cpp:gcs_core_open():209: Failed to open backend connection: -110 (Connection timed out)
> 2022-02-04 17:40:36 0 [ERROR] WSREP: gcs/src/gcs.cpp:gcs_open():1475: Failed to open channel 'openstack' at 'gcomm://10.0.5.109:4567,10.0.5.110:4567': <> -110 (Connection timed out)
> 2022-02-04 17:40:36 0 [ERROR] WSREP: gcs connect failed: Connection timed out
> 2022-02-04 17:40:36 0 [ERROR] WSREP: wsrep::connect(gcomm://10.0.5.109:4567,10.0.5.110:4567 <>) failed: 7
> 2022-02-04 17:40:36 0 [ERROR] Aborting
> 
> 
> 
> 
> I do not know what to do. My installation is done with kolla-ansible, mariadb docker restarts every 30 seconds.
> 
> Can the "kolla-ansible reconfigure mariadb" command be a solution?
> Could the command "kolla-ansible mariadb recovery" be a solution?
> 
> Thanks in advance if you can help me.
> 
> 
> 
> Franck
> 
> 

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