>>> Jan Friesse <jfrie...@redhat.com> schrieb am 24.06.2019 um 08:52 in Nachricht <bb3cf1ca-1232-82f8-95f0-de57eadbe...@redhat.com>: > Somanath, > >> Hi All, >> >> I have a two node cluster with multicast (udp) transport . The multicast IP
> used in 224.1.1.1 . > > Would you mind to give a try to UDPU (unicast)? For two node cluster > there is going to be no difference in terms of speed/throughput. I think a better recommendation would be raising the timeouts of the corosync protocol. I agree that the syslog message provides very little usefulk information to the user: WHY does the retransmit list grow? > >> >> Whenever there is a CPU intensive task the pcs cluster goes into split brain > scenario and doesn't recover automatically . We have to do a manual restart > of services to bring both nodes online again. > Before the nodes goes into split brain , the corosync log shows , >> >> May 24 15:10:02 server1 corosync[4745]: [TOTEM ] Retransmit List: 7c 7e >> May 24 15:10:02 server1 corosync[4745]: [TOTEM ] Retransmit List: 7c 7e >> May 24 15:10:02 server1 corosync[4745]: [TOTEM ] Retransmit List: 7c 7e >> May 24 15:10:02 server1 corosync[4745]: [TOTEM ] Retransmit List: 7c 7e >> May 24 15:10:02 server1 corosync[4745]: [TOTEM ] Retransmit List: 7c 7e > > This is usually happening when: > ‑ multicast is somehow rate‑limited on switch side (configuration/bad > switch implementation/...) > ‑ MTU of network is smaller than 1500 bytes and fragmentation is not > allowed ‑> try reduce totem.netmtu > > Regards, > Honza > > >> May 24 15:51:42 server1 corosync[4745]: [TOTEM ] A processor failed, > forming new configuration. >> May 24 16:41:42 server1 corosync[4745]: [TOTEM ] A new membership > (10.241.31.12:29276) was formed. Members left: 1 >> May 24 16:41:42 server1 corosync[4745]: [TOTEM ] Failed to receive the > leave message. failed: 1 >> >> Is there any way we can overcome this or this may be due to any multicast > issues in the network side. >> >> With Regards >> Somanath Thilak J >> >> >> >> >> >> >> >> _______________________________________________ >> Manage your subscription: >> https://lists.clusterlabs.org/mailman/listinfo/users >> >> ClusterLabs home: https://www.clusterlabs.org/ >> > > _______________________________________________ > Manage your subscription: > https://lists.clusterlabs.org/mailman/listinfo/users > > ClusterLabs home: https://www.clusterlabs.org/ _______________________________________________ Manage your subscription: https://lists.clusterlabs.org/mailman/listinfo/users ClusterLabs home: https://www.clusterlabs.org/