[SOLVED] Cluster lost quorum after last update

[Tsi_tech]

Hello,

We are running a simple cluster of two nodes ( pve 5.4.13).
After last update ans reboot of the two nodes, cluster lost quorum after few minutes.
We made several tests and tried many solutions showed in this forum with no luck.

omping command ran on two nodes returned this :

192.168.1.95 :   unicast, xmt/rcv/%loss = 10000/10000/0%, min/avg/max/std-dev = 0.094/0.188/0.825/0.037
192.168.1.95 : multicast, xmt/rcv/%loss = 10000/0/100%, min/avg/max/std-dev = 0.000/0.000/0.000/0.000

multicast seemed to fail.

syslog in the meantime showed this :

error [TOTEM ] FAILED TO RECEIVE

This post on the forum bring us a solution in disabling "multicast-snooping" by type this command line on one of the two nodes

echo 0 > /sys/class/net/vmbr0/bridge/multicast_snooping

Qorum is now reached and here is the result of omping commande :

prx1 :   unicast, xmt/rcv/%loss = 9999/9999/0%, min/avg/max/std-dev = 0.099/0.188/0.748/0.032
prx1 : multicast, xmt/rcv/%loss = 9999/9999/0%, min/avg/max/std-dev = 0.109/0.206/0.619/0.031

 

[Dominic]

Qorum is now reached and here is the result of omping commande :

Great that your problem is solved!

You didn't mention an external voter. We generally recommend having one for two node clusters (see documentation).

 

[Tsi_tech]

We will take a closer look at this part of the configuration.
thank you for drawing our attention to this.