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.
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
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