[ale] RedHat HA Assistance

[Sam Davis]

They do reboot each other when the cluster is up and running.  Would a very
small third node with an extremely low priorty be preferential over a qdisk?

Sam

On Wed, Sep 12, 2012 at 1:23 PM, Scott McBrien <smcbrien at gmail.com> wrote:

> It's because your cluster is split-brained.  Best option would be to add a
> third node.  If you can't do that, you could add a qdisk *wretches*.
>  Seriously, third node.
>
> Also, I the machines aren't constantly rebooting each other, I'd guess
> your fencing isn't working as well.
>
> -Scott
>
> On Sep 12, 2012, at 1:15 PM, Sam Davis <aracthabar at gmail.com> wrote:
>
> > Hello All,
> >
> >    I'm wondering if anyone had expirence with RedHat's HA solution.
>  We're trying to setup a 2 node failover cluster for a Drupal install using
> multipath disks attached via HBAs.   It seems to work fine at the start,
> but after a while neither node can take ownership of the clustered volume
> group.  At this point, even trying to stop the clvmd service just hangs.
>  Any hints or pointers would be appreciated.  Below is the cluster.conf
> >
> >
> > Thank you,
> > Sam Davis
> >
> >
> >
> > <?xml version="1.0"?>
> > <cluster config_version="25" name="moodle_cluster">
> >         <clusternodes>
> >                 <clusternode name="mario.REDACTED.REDACTED" nodeid="1">
> >                         <fence>
> >                                 <method name="RSA">
> >                                         <device name="Mario_RSA"/>
> >                                 </method>
> >                         </fence>
> >                 </clusternode>
> >                 <clusternode name="luigi.REDACTED.REDACTED" nodeid="2"/>
> >         </clusternodes>
> >         <fencedevices>
> >                 <fencedevice agent="fence_ipmilan" auth="password"
> ipaddr="REDACTED" login="admin" name="Mario_RSA" passwd="REDACTED"/>
> >                 <fencedevice agent="fence_ipmilan" auth="password"
> ipaddr="REDACTED" login="admin" name="Luigi_RSA" passwd="REDACTED"/>
> >         </fencedevices>
> >         <rm>
> >                 <failoverdomains>
> >                         <failoverdomain name="Mario_Preferred"
> nofailback="1" ordered="1">
> >                                 <failoverdomainnode
> name="mario.REDACTED.REDACTED" priority="1"/>
> >                                 <failoverdomainnode
> name="luigi.REDACTED.REDACTED"/>
> >                         </failoverdomain>
> >                 </failoverdomains>
> >                 <resources>
> >                         <ip address="REDACTED" sleeptime="10"/>
> >                         <clusterfs device="/dev/vg_moodle/moodle_lv"
> force_unmount="on" fsid="27336" fstype="gfs2" mountpoint="/srv"
> name="moodle_gfs" options="rw,noatime,_netdev"/>
> >                         <script file="/etc/init.d/httpd" name="Httpd"/>
> >                 </resources>
> >                 <service domain="Mario_Preferred" name="moodle_service"
> recovery="relocate">
> >                         <clusterfs ref="moodle_gfs"/>
> >                         <ip ref="REDACTED"/>
> >                         <script ref="Httpd"/>
> >                 </service>
> >         </rm>
> >         <cman expected_votes="1" two_node="1"/>
> > </cluster>
> >
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