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Re: [Linux-cluster] Two node cluster, start CMAN fence the other node

Thank you very much.
The Cisco setup is very useful and the commands for testing multicast as well.
Loking at your cluster.conf, I would have thought that any limits on dlm and gfs lock rates are counterproductive in the days of multicore CPUs and GbE.  They should be unlimited in my opinion.  Under high load the limiting factor will be saturation of one core by gfs control daemon.
Chris Jankowski

From: linux-cluster-bounces redhat com [mailto:linux-cluster-bounces redhat com] On Behalf Of Alex Re
Sent: Saturday, 17 April 2010 01:36
To: linux clustering
Subject: Re: [Linux-cluster] Two node cluster, start CMAN fence the other node

Hi Chris,

for the switches ports stuff check out this url:

We have finally configured an internal (private) VLAN joining there one NIC of each blade server. Now all cluster related traffic goes through those interfaces (eth2 at both servers in our case), including the traffic generated by the lock_dlm of the GFS2 filesystem, just created.

To check multicast connectivity, these are two very useful commands, "nc -u -vvn -z <multicast_IP> 5405" to generate some multicast udp traffic and "tcpdump -i eth2 ether multicast" to check it from the other node. (eth2 in my particular case, of course).

I have been playing a little with the lock_dlm, but here is how my cluster.conf looks now:

<?xml version="1.0"?>
<cluster config_version="7" name="VCluster">
    <fence_daemon post_fail_delay="0" post_join_delay="25"/>
        <clusternode name="nodeaint" nodeid="1" votes="1">
            <multicast addr="" interface="eth2"/>
                <method name="1">
                    <device name="nodeaiLO"/>
        <clusternode name="nodebint" nodeid="2" votes="1">
            <multicast addr="" interface="eth2"/>
                <method name="1">
                    <device name="nodebiLO"/>
    <cman expected_votes="1" two_node="1">
        <multicast addr=""/>
        <fencedevice agent="fence_ilo" hostname="nodeacn" login="user" name="nodeaiLO" passwd="hp"/>
        <fencedevice agent="fence_ilo" hostname="nodebcn" login="user" name="nodebiLO" passwd="hp"/>
    <dlm plock_ownership="1" plock_rate_limit="500"/>
    <gfs_controld plock_rate_limit="500"/>

Next thing to add... I'm going to play a little with the quorum devices.

Hope it helps!


On 04/16/2010 05:00 PM, Jankowski, Chris wrote:
eparate the cluster interconne

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