[Linux-cluster] Quorum disk

Hunt, Gary Gary_Hunt at gallup.com
Thu Feb 19 23:05:46 UTC 2009

Increasing the timeouts definitely helped.  I also was using a flawed test to simulate a failure.  I was taking down the network; which left qdisk in tack.  Cman fenced the node before qdisk had a chance to do anything.  A hard power down produced the results I would expect.

From: linux-cluster-bounces at redhat.com [mailto:linux-cluster-bounces at redhat.com] On Behalf Of Tomasz Sucharzewski
Sent: Wednesday, February 18, 2009 1:57 PM
To: linux clustering
Subject: Re: [Linux-cluster] Quorum disk

I had the same issue and I solved it,
Just increase quorum check interval. 2 seconds is to less to inform cman about quorum status.
I had to increase it  to 7 seconds but remember it also influence cman timeout which must be verified.
Best regards,

On Feb 17, 2009, at 9:12 PM, Hunt, Gary wrote:

Having an issue with my 2 node cluster.  Think it is related to the quorum disk.

2 node RHEL 5.3 cluster with quorum disk.  Virtual servers running on each node.

Whenever node1 takes over the master role in qdisk it looses quorum and restarts all the virtual servers.  It does regain quorum a few seconds later.  If node1 is already the master and I fail node2; things work as expected.  Node2 doesn't seem to have a problem taking over master role.

Whenever node1 needs to take over master role the cluster looses quorum.  Here is my cluster.conf.  Any suggestions on what may be causing this?

<?xml version="1.0"?>
<cluster alias="xencluster" config_version="13" name="xencluster">
        <fence_daemon clean_start="0" post_fail_delay="0" post_join_delay="3"/>
                <clusternode name="ricci2b.gallup.com" nodeid="2" votes="1">
                                <method name="1">
                                        <device name="ricci2b"/>
                <clusternode name="ricci1b.gallup.com" nodeid="1" votes="1">
                                <method name="1">
                                        <device name="ricci1b"/>
        <cman expected_votes="3" two_node="0"/>
                <fencedevice agent="fence_ipmilan" ipaddr="" login="xxxx" name="ricci1b" passwd="xxxxxx"/>
                <fencedevice agent="fence_ipmilan" ipaddr="" login="xxxx" name="ricci2b" passwd="xxxxxx"/>
                <vm autostart="1" exclusive="0" name="rhel_full" path="/xenconfigs" recovery="restart"/>
                <vm autostart="1" exclusive="0" name="rhel_para" path="/xenconfigs" recovery="restart"/>
        <quorumd interval="2" label="quorum_disk_from_ricci1" min_score="1" tko="3" votes="1"/>
        <totem consensus="4800" join="60" token="12000" token_retransmits_before_loss_const="20"/>



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