[Linux-cluster] Freezing GFS mount in a cluster

[Wayne Carty]

I'm currently using  the same ISCSI san with a 2 node cluster and not having
any issues. I'm currently running Centos 4.6. Are you using conga to manage
your cluster? what does clustat  show when you run it before mounting you
gfs filesystem. I'm also using manual fencing and so far I'm not having a
problem.  Here is a look at my config. I'm not using it to run any services
or to mount the filesystems. It's just basic.

 <?xml version="1.0"?>
<cluster alias="Enterprise Cluster" config_version="8" name="121044786478">
        <fence_daemon clean_start="0" post_fail_delay="0"
post_join_delay="3"/>
        <clusternodes>
                <clusternode name="node01" nodeid="1" votes="1">
                        <fence>
                                <method name="1">
                                        <device name="manual"
nodename="node01"/>
                                </method>
                        </fence>
                </clusternode>
                <clusternode name="node02" nodeid="2" votes="1">
                        <fence>
                                <method name="1">
                                        <device name="manual"
nodename="node02"/>
                                </method>
                        </fence>
                </clusternode>
        </clusternodes>
        <cman expected_votes="1" two_node="1"/>
        <fencedevices>
                <fencedevice agent="fence_manual" name="manual"/>
        </fencedevices>
        <rm>
                <failoverdomains/>
                <resources/>
        </rm>
</cluster>
~






On Tue, Jul 8, 2008 at 8:25 AM, Kees Hoekzema <kees at tweakers.net> wrote:

> Hello List,
>
> Recently we bought an Dell MD3000 iSCSI storage system and we are trying to
> get GFS running on it. I have 3 test servers hooked up to the MD3000i and I
> have the cluster working, including multipath and different paths.
>
> When I had the cluster up with all 3 nodes in the fence domain and
> cman_tool
> status reporting 3 nodes I made a GFS partition and formatted it:
> # gfs_mkfs -j 10 -p lock_dlm -t tweakers:webdata /dev/mapper/webdata-part1
>
> This worked and I could mount the filesystem on the server I made it on.
> However, as soon as I tried to mount it on one of the two other servers, I
> would get a freeze and get fenced. After a fresh reboot of the complete
> cluster I tried to mount it again. The first server could mount it, but any
> server that would try to mount it with the first server having the gfs
> mounted would crash.
>
> As I'm fairly new to cman/fencing/gfs-clusters, I was wondering if this is
> something 'silly' configuration error, or that there is something seriously
> wrong.
>
> Another thing I would like to know is where to get debug information. Right
> now there is not a lot debug information available, or at least I couldn't
> find it. One thing that particularly annoyed me was the ' Waiting for
> fenced
> to join the fence group.' message which didn't come with any explanation
> whatsoever. That message finally went away when I powered up the two other
> servers and started the cluster on all three simultaneously.
>
> Anyway, my cluster config for this testing. I use  manual fencing for
> testing as the environment I test it in does not have exactly the same
> hardware as I have in the production environment.
>
> <?xml version="1.0"?>
> <cluster name="tweakers" config_version="4">
>  <cman expected_votes="1">
>  </cman>
>  <clusternodes>
>
>    <clusternode name="ares" nodeid="1" votes="1">
>      <fence>
>        <method name="human">
>          <device name="last_resort" ipaddr="node1"/>
>        </method>
>      </fence>
>    </clusternode>
>
>   <clusternode name="abaris" nodeid="2" votes="1">
>      <fence>
>        <method name="human">
>          <device name="last_resort" ipaddr="node2"/>
>        </method>
>      </fence>
>    </clusternode>
>
>   <clusternode name="adonis" nodeid="3" votes="1">
>      <fence>
>        <method name="human">
>          <device name="last_resort" ipaddr="node2"/>
>        </method>
>      </fence>
>    </clusternode>
>  </clusternodes>
>
>  <fencedevices>
>    <fencedevice name="last_resort" agent="fence_manual"/>
>  </fencedevices>
>  <fence_daemon clean_start="0"/>
>  <fence_daemon post_join_delay="30"/>
>  <fence_daemon post_fail_delay="30"/>
>  <rm log_level="7" log_facility="syslog">
>  </rm>
>
> </cluster>
>
> Conclusion:
> - why can't I mount GFS on another server, when it is mounted on one?
> - how do I get more debug information (ie: reason why a server can't join a
> fence domein. Or the reason why a server gets fenced).
>
> Thank you all for your time,
>
> Kees Hoekzema
>
>
> --
> Linux-cluster mailing list
> Linux-cluster at redhat.com
> https://www.redhat.com/mailman/listinfo/linux-cluster
>



-- 
Wayne Carty
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