Hi,
Check your software bridge.
Please, try
# echo 0 > /sys/class/net/${YOURBRIDGE}/bridge/multicast_snooping
Masatake YAMATO
> Hi,
>
> I've got a very small and very lightly utilized corosync
> 1.4.1[-7.el6_3.1.x86_64] configuration on 4 EL6 KVM virtual nodes (which
> are running on FC17 as the KVM host). The libvirt networking I am using
> for the 4 nodes is a completely virtual (i.e. not bridged with any real
> interface) network.
>
> I have the 4 nodes configured into 2 corosync clusters on multicast
> ports 5405 and 5410 respectively.
>
> On top of corosync I am running pacemaker 1.1.7[-6.el6.x86_64].
>
> What I am finding is that while the clusters will come up even just the
> slightest amount of pacemaker activity will start to cause corosync to
> report the following sorts of messages:
>
> Nov 26 15:43:52 mds2 corosync[1293]: [TOTEM ] Retransmit List: 1c8 1c9
> Nov 26 15:43:53 mds2 corosync[1293]: [TOTEM ] Retransmit List: 1c8 1c9
> Nov 26 15:43:53 mds2 corosync[1293]: [TOTEM ] Retransmit List: 1c8 1c9
> Nov 26 15:43:53 mds2 corosync[1293]: [TOTEM ] Retransmit List: 1c8 1c9
> Nov 26 15:43:53 mds2 corosync[1293]: [TOTEM ] Retransmit List: 1c8 1c9
> Nov 26 15:43:53 mds2 corosync[1293]: [TOTEM ] Retransmit List: 1c8 1c9
> Nov 26 15:43:54 mds2 corosync[1293]: [TOTEM ] Retransmit List: 1c8 1c9
> Nov 26 15:43:54 mds2 corosync[1293]: [TOTEM ] Retransmit List: 1c8 1c9
>
> Some research seems to yield that typical causes of this problem are:
> * machines that are quite different in performance
> * slow networks
>
> I don't seem to have either of those. Given that my machines are VMs on
> KVM all built from the same template and running on a KVM host with 16GB
> or RAM and 8 CPU cores there should be plenty of resources for them and
> they should get fairly equal access to those resources, ruling out the
> first item.
>
> The virtual network the nodes are using is entirely unused but for the
> corosync traffic and bit of SSH, etc. so I can't imagine there being any
> serious shortage there. I'm happy to be proven wrong there though.
>
> Any ideas on how to resolve this situation?
>
> FWIW, this configuration of VMs on the particular KVM host has worked
> just fine it the past. The only thing that could be different from when
> it has worked just fine would be upgraded packages on the EL6 VMs. Has
> anything resembling this possibly been introduced into the most recent
> of packages that would come from an up-to-date EL6?
>
> Cheers,
> b.
>
>
> _______________________________________________
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> discuss@xxxxxxxxxxxx
> http://lists.corosync.org/mailman/listinfo/discuss
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