RE: fencing loop

"Mark Chaney" <macscr@xxxxxxxxxx> · Mon, 29 Sep 2008 10:31:39 -0500

Title: R:  fencing loop

Here is my cluster.conf

#########################################

<?xml version="1.0"?>

<cluster alias="myiacon"
config_version="16" name="myiacon">

      <fence_daemon clean_start="0"
post_fail_delay="0"

post_join_delay="60"/>

      <clusternodes>

            <clusternode
name="ratchet.local" nodeid="1" votes="1">

                  <fence>

                        <method name="1">

                              <device
name="ratchet_ipmi"/>

                        </method>

                  </fence>

            </clusternode>

            <clusternode
name="skydive.local" nodeid="2" votes="1">

                  <fence>

                        <method name="1">

                              <device
name="skydive_ipmi"/>

                        </method>

                  </fence>

            </clusternode>

            <clusternode
name="wheeljack.local" nodeid="3" votes="1">

                  <fence>

                        <method name="1">

                              <device
name="wheeljack_ipmi"/>

                        </method>

                  </fence>

            </clusternode>

      </clusternodes>

      <cman/>

      <fencedevices>

            <fencedevice
agent="fence_ipmilan" ipaddr="192.168.1.100"

login="root" name="ratchet_ipmi"
passwd="xxxxx"/>

            <fencedevice
agent="fence_ipmilan" ipaddr="192.168.1.102"

login="root" name="skydive_ipmi"
passwd="xxxxx"/>

            <fencedevice
agent="fence_ipmilan" ipaddr="192.168.1.101"

login="root" name="wheeljack_ipmi"
passwd="xxxxxx"/>

      </fencedevices>

      <rm>

            <failoverdomains/>

            <resources/>

      </rm>

</cluster>

#############################################

From:
linux-cluster-bounces@xxxxxxxxxx [mailto:linux-cluster-bounces@xxxxxxxxxx] On
Behalf Of Edoardo Causarano

Sent: Monday, September 29, 2008 4:51 AM

To: linux-cluster@xxxxxxxxxx

Subject: R:  fencing loop

Well, you're using iscsi so restarting
network will impact access to the fs (a quorum disk wouldn't help either).
Maybe timeouts are too short and the machines are queuing fence commands too
soon. How is your fencing config'd? (net, same iface or private, serial)
describe scenario more accurately: name machines A B C, it's not clear if two
nodes are fencing each other or if the third one is.

-----Original Message-----

From: linux-cluster-bounces@xxxxxxxxxx
<linux-cluster-bounces@xxxxxxxxxx>

To: linux-cluster@xxxxxxxxxx <linux-cluster@xxxxxxxxxx>

Sent: Sun Sep 28 21:04:12 2008

Subject:  fencing loop

My cluster nodes are getting fenced when I simply just restart the network

service. What can I do to prevent that happening so quick? Can I even

prevent it since im using GFS?

I have a 3 node cluster running CentOS 5.2. They all are connected to my

iscsi SAN, so CLVMD is being used and GFS as well.

To make things worse, it appears that 2 servers were fenced when I simply

restarted the network service on one server. One server came back online,

the second one did, but then was immediately fenced again. Seems to loop

until I basically stop the cluster and have everyone rejoin.

Any help/ideas would sincerely be appreciated.

- Mark

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