[DRBD-user] Best Practice with DRBD RHCS and GFS2?

J. Ryan Earl oss at jryanearl.us
Tue Oct 26 18:37:58 CEST 2010


On Fri, Oct 22, 2010 at 12:49 PM, Colin Simpson <Colin.Simpson at iongeo.com>wrote:

> Maybe I just need to leave for a long time ? Or I wonder because you
> have "noquota" in your mount options and the oops is in gfs2_quotad
> modules you never see it?
>

I saw that too...  I'm not sure if the noquota statement has any effect, I
didn't have any problems before adding that but I saw in some tuning
document it could help performance.


>
> Though I don't see why you are adding the /etc/init.d/gfs2 service to
> the cluster.conf, as all that does is mount gfs2 filesystems from fstab
> (and you say these are noauto in there), so will this do anything? The
> inner "clusterfs" directives will handle the actual mount?
>

It's to handle the unmount so that the volume goes down cleanly when the
rgmanager service stops.  clusterfs won't stop the mount, so I put the mount
in /etc/fstab with "noauto" so let rgmanager mount and unmount GFS2.


> <resources>
>   <clusterfs device="/dev/CluVG0/CluVG0-projects" force_umount="0"
> fstype="gfs2" mountpoint="/mnt/projects" name="projects" options="acl"/>
>   <nfsexport name="tcluexports"/>
>   <nfsclient name="NFSprojectsclnt" options="rw"
> target="192.168.1.0/24"/>
>    <ip address="192.168.1.60" monitor_link="1"/>
> </resources>
>    <service autostart="1" domain="clusterA" name="NFSprojects">
>     <ip ref="192.168.1.60"/>
>     <clusterfs fstype="gfs" ref="projects">
>       <nfsexport ref="tcluexports">
>          <nfsclient name=" " ref="NFSprojectsclnt"/>
>        </nfsexport>
>      </clusterfs>
>    </service>


YMMV but I found it best to keep 'chkconfig gfs2 off' and control that as a
script from rgmanager.  It fixed order of operation issues such as the GFS2
volume being mounted still during shutdown.  I'd wrap all your gfs clusterfs
stanzas within a script for gfs2.  I suspect your gfs2 is recovering after
an unclean shutdown, if you're using quotas that could add time to that
operation I suppose.  Does it eventually come up if you just wait?

-JR
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