[ale] RedHat HA Assistance

[scott mcbrien]

That would be my suggestion.  Mark it as the lest preferred in your
failover domain, so that it won't get assigned the service in a
failover.  It could even be a VM ;-)  But yes, I'd recommend that over
a qdisk.  In my experience, qdisks are flaky.

-Scott

On Wed, Sep 12, 2012 at 1:27 PM, Sam Davis <aracthabar at gmail.com> wrote:
> 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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