[Linux-cluster] Re: Nodes show up extremely slowly (or not at all)

Nikolas Lam nlam87346 at library.usyd.edu.au
Fri Aug 24 13:36:40 UTC 2007

On Fri, 2007-08-24 at 15:12 +0200, Kadlecsik Jozsi wrote:
> On Fri, 24 Aug 2007, Kadlecsik Jozsi wrote:
> > It took 13 minutes(!) for 'lsxerv0' to notice 'lxserv1'.
> It turned out to be a switch-related multicast problem: openais used the 
> default(?) address, while the switch strangely enough passes 
> the 224.0.0.x addresses only. So by setting the multicast address in
> cluster.conf explicitly to cured the problem.

Hi Jozsef,

I think I might be having similar problems. However I seem to be unable
to specify a multicast address manually using conga / luci (the web
based tool). When I press "apply" I see the reconfiguration happening,
but when I look at my cluster.conf, there's no multicast address in

<?xml version="1.0"?>
<cluster alias="clust0" config_version="10" name="clust0">
        <fence_daemon clean_start="0" post_fail_delay="0"
                <clusternode name="host0.library.usyd.edu.au" nodeid="1"
                                <method name="1">
                                        <device name="host0"/>
                <clusternode name="host1.library.usyd.edu.au" nodeid="2"
                                <method name="1">
                                        <device name="host1"/>
        <cman expected_votes="1" two_node="1"/>
                <fencedevice action="reboot" agent="fence_ilo" force="1"
hostname="" login="clust0" name="host0" passwd="ilopasswd"/>
                <fencedevice action="reboot" agent="fence_ilo" force="1"
hostname="" login="clust0" name="host1" passwd="ilopasswd"/>

Also when I try

 netstat -gn

itill seems to show the multicast address that openais chose by itself:

[root at host0 ~]# netstat -gn
IPv6/IPv4 Group Memberships
Interface       RefCnt Group
--------------- ------ ---------------------
lo              1
eth0            1
eth0            1
eth0            1
eth0            1
[root at host0 ~]# 

Could I please have a look at your cluster.conf?


Nik Lam
Unix-like Systems Administrator
Library IT Services                   
Level 1, Fisher Library (Building F03)
The University of Sydney, NSW 2006, Australia
Phone: +61 2 9351 4304       Fax: +61 2 9351 7769
CRICOS Provider Number: 00026A

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