[Linux-cluster] cman + qdisk timeouts....

Wed Jul 8 08:40:21 UTC 2009

Hi,

I added a heuristic checking network status and help in network failure scenarios.

However, I still face the same problem as soon as I stop the services orderly in the node holding the qdisk master role or reboot it.

If I execute in master qdisk node:

# service rgmanager stop
# service clvmd stop
# service qdiskd stop
# service cman stop

As said by Red Hat, I get the quorum lost in the other node until get the master role (some seconds) and stop the services.

I'm managing that by adding a sleep after stopping qdiskd long enough for the other node to become master, and then stop cman.

I understand this is a bug.

My cluster.conf file:

<?xml version="1.0"?>
<cluster alias="clueng" config_version="13" name="clueng">
        <fence_daemon clean_start="1" post_fail_delay="0" post_join_delay="10"/>
        <clusternodes>
                <clusternode name="rmamseslab05" nodeid="1" votes="1">
                        <fence>
                                <method name="1">
                                        <device name="iLO_NODE1"/>
                                </method>
                                <method name="2">
                                        <device name="manual_fencing" nodename="rmamseslab05"/>
                                </method>
                        </fence>
                </clusternode>
                <clusternode name="rmamseslab07" nodeid="2" votes="1">
                        <fence>
                                <method name="1">
                                        <device name="iLO_NODE2"/>
                                </method>
                                <method name="2">
                                        <device name="manual_fencing" nodename="rmamseslab07"/>
                                </method>
                        </fence>
                </clusternode>
        </clusternodes>
        <cman/>
        <totem token="45000"/>
        <quorumd device="/dev/mapper/mpathquorump1" interval="5" status_file="/tmp/qdisk" tko="3" votes="1">
                <heuristic program="/usr/local/cmcluster/conf/admin/test_hb.sh" score="1" interval="3"/>
        </quorumd>
        <fencedevices>
                <fencedevice agent="fence_manual" name="manual_fencing"/>
                <fencedevice agent="fence_ilo" hostname="rbrmamseslab05" login="LANO" name="iLO_NODE1" passwd="**"/>
                <fencedevice agent="fence_ilo" hostname="rbrmamseslab07" login="LANO" name="iLO_NODE2" passwd="**"/>
        </fencedevices>
        <rm>
                <!-- Configuration of the resource group manager -->
                <failoverdomains>
                </failoverdomains>
                <service autostart="1" exclusive="0" max_restarts="1" name="pkg_test" recovery="restart" restart_expire_time="900">
                        <script file="/etc/cluster/pkg_test/startstop.sh" name="pkg_test"/>
                </service>
                <resources>
                    <nfsexport name="nfs_export"/>
                </resources>
        </rm>
</cluster>

Best regards,

Alfredo

________________________________
From: linux-cluster-bounces at redhat.com [mailto:linux-cluster-bounces at redhat.com] On Behalf Of Juan Ramon Martin Blanco
Sent: Tuesday, July 07, 2009 12:21 PM
To: linux clustering
Subject: Re: [Linux-cluster] cman + qdisk timeouts....

On Mon, Jun 15, 2009 at 4:17 PM, Moralejo, Alfredo <alfredo.moralejo at roche.com<mailto:alfredo.moralejo at roche.com>> wrote:

Hi,

I'm having what I think is a timeouts issue in my cluster.

I have a two node cluster using qdisk. Everytime the node that has the master role for qdisk becomes down (for failure or even stopping qdiskd manually), packages in the sane node are stopped because of the lack of quorum as the qdiskd becames unresponsive until second node becames master node and start working properly. Once qdiskd start working fine (usually 5-6 seconds) packages are started again.

I've read in the cluster manual section for "CMAN membership timeout value" and I think this is the case. I've used RHEL 5.3 and I thought this parameter is the token that I set much longer that needed:

<cluster alias="CLUSTER_ENG" config_version="75" name="CLUSTER_ENG">

        <totem token="50000"/>

...

        <quorumd device="/dev/mapper/mpathquorump1" interval="3" status_file="/tmp/qdisk" tko="3" votes="5" log_level="7" log_facility="local4"/>

Totem token is much more that double of qdisk timeout, so I guess it should be enough but everytime qdisk dies in the master node I get same result, services restarted in the sane node:

Jun 15 16:11:33 rmamseslab07 qdiskd[14130]: <debug> Node 1 missed an update (2/3)

Jun 15 16:11:38 rmamseslab07 qdiskd[14130]: <debug> Node 1 missed an update (3/3)

Jun 15 16:11:43 rmamseslab07 qdiskd[14130]: <debug> Node 1 missed an update (4/3)

Jun 15 16:11:43 rmamseslab07 qdiskd[14130]: <debug> Node 1 DOWN

Jun 15 16:11:43 rmamseslab07 qdiskd[14130]: <debug> Making bid for master

Jun 15 16:11:44 rmamseslab07 clurgmgrd: [18510]: <info> Executing /etc/init.d/watchdog status

Jun 15 16:11:48 rmamseslab07 qdiskd[14130]: <debug> Node 1 missed an update (5/3)

Jun 15 16:11:53 rmamseslab07 qdiskd[14130]: <debug> Node 1 missed an update (6/3)

Jun 15 16:11:53 rmamseslab07 qdiskd[14130]: <info> Assuming master role

Message from syslogd at rmamseslab07 at Jun 15 16:11:53 ...

 clurgmgrd[18510]: <emerg> #1: Quorum Dissolved

Jun 15 16:11:53 rmamseslab07 openais[14087]: [CMAN ] lost contact with quorum device

Jun 15 16:11:53 rmamseslab07 openais[14087]: [CMAN ] quorum lost, blocking activity

Jun 15 16:11:53 rmamseslab07 clurgmgrd[18510]: <debug> Membership Change Event

Jun 15 16:11:53 rmamseslab07 clurgmgrd[18510]: <emerg> #1: Quorum Dissolved

Jun 15 16:11:53 rmamseslab07 clurgmgrd[18510]: <debug> Emergency stop of service:Cluster_test_2

Jun 15 16:11:53 rmamseslab07 clurgmgrd[18510]: <debug> Emergency stop of service:wdtcscript-rmamseslab05-ic

Jun 15 16:11:53 rmamseslab07 clurgmgrd[18510]: <debug> Emergency stop of service:wdtcscript-rmamseslab07-ic

Jun 15 16:11:54 rmamseslab07 clurgmgrd[18510]: <debug> Emergency stop of service:Logical volume 1

Jun 15 16:11:58 rmamseslab07 qdiskd[14130]: <debug> Node 1 missed an update (7/3)

Jun 15 16:11:58 rmamseslab07 qdiskd[14130]: <notice> Writing eviction notice for node 1

Jun 15 16:11:58 rmamseslab07 qdiskd[14130]: <debug> Telling CMAN to kill the node

Jun 15 16:11:58 rmamseslab07 openais[14087]: [CMAN ] quorum regained, resuming activity

I've just logged a case but... any idea????

Regards,
Hi!

Have you set two_node="0" in cman section?
Why don't you use any heuristics within the quorumd configuration? I.e: pinging a router...
Could you paste us your cluster.conf?

Greetings,
Juanra

Alfredo Moralejo
Business Platforms Engineering - OS Servers - UNIX Senior Specialist

F. Hoffmann-La Roche Ltd.

Global Informatics Group Infrastructure
Josefa Valcárcel, 40
28027 Madrid SPAIN

Phone: +34 91 305 97 87

alfredo.moralejo at roche.com<mailto:alfredo.moralejo at roche.com>

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