[ale] RedHat HA Assistance

[Sam Davis]

Thank you very much.

Sam

On Wed, Sep 12, 2012 at 1:30 PM, scott mcbrien <smcbrien at gmail.com> wrote:

> 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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