Re: Halt nodes in cluster with cable disconnect

[emmanuel segura <emi2fast@xxxxxxxxx>]

Hello Miguel

Talking about the problem when both nodes gets poweroff, this is called fencing-race, Redhat has this problem from so much time and the only fix was made it

fence delay

delay="30"

man fence_ipmilan

And I thinks you can look for a quorum qdisk

2012/1/24 Miguel Angel Guerrero <kortux@xxxxxxxxx>

Hi i'm trying to setup a centos cluster with two nodes with cman, drbd, gfs2 and i'm using ipmi for fencing. DRBD is set up between the nodes using a dedicated interface. So, when I unplug the drbd network cable, both nodes power off immediatly (i tried using crossover cable and both nodes connected to a switch, but both scenarios fail), and the logs doesn't seem to show something useful. In a previous thread on this list, it is recommended to deactivate ACPID daemon, even at BIOS level, but I'm still having troubles.

If I simulate a physical disconnection with ifdown command in some node, this node reboots with no hassle, but unpluging the cable kills both nodes. I think the first scenario is correct, but the second one is not what I expect.

Thanks for your help the next are my cluster.conf

  <?xml version="1.0"?>

<cluster config_version="2" name="WSGClust">

        <cman expected_votes="1" two_node="1"/>

        <clusternodes>

                <clusternode name="wsguardian1" nodeid="1">

                        <fence>

                                <method name="wsguardian1_ipmi">

                                        <device name="ipmi1" action="">

                                </method>

                        </fence>

                </clusternode>

                <clusternode name="wsguardian2" nodeid="2">

                        <fence>

                                <method name="wsguardian2_ipmi">

                                        <device name="ipmi2" action="">

                                </method>

                        </fence>

                </clusternode>

        </clusternodes>

        <fencedevices>

                <fencedevice agent="fence_ipmilan" ipaddr="192.168.201.220" lanplus="1" login="ADMIN" name="ipmi1" passwd="itac321"/>

                <fencedevice agent="fence_ipmilan" ipaddr="192.168.201.186" lanplus="1" login="ADMIN" name="ipmi2" passwd="itac321"/>

        </fencedevices>

</cluster>

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Miguel Angel Guerrero
Usuario GNU/Linux Registrado #353531
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