[Linux-cluster] hangs when copying with gnbd and gfs

[wolfgang pauli]

Hi, 
 
I could successfully mount a gfs partition and export with gnbd. It was 
also very fast, when I was moving a file from the client to the server, 
but if I try a second operation, like copying the file back, it always 
hangs. I can not even do copy files locally to the gfs partition anymore. 
Unfortunately, there is no info at all in the syslog or any other logfile. 
And the "gnbd_import -vl" and "gnbd_export -vl" don't show any error 
either. I guess it has something to do with the locking or fencing, but I 
don't understand that very well. Below it my config etc. Thanks for any 
hints!! 
 
<?xml version="1.0"?> 
<cluster config_version="29" name="oreilly_cluster"> 
        <fence_daemon post_fail_delay="0" post_join_delay="3"/> 
        <clusternodes> 
                <clusternode name="eon" votes="1"> 
                        <fence> 
                                <method name="1"> 
                                        <device name="manual_fence" 
nodename="eon"/> 
                                </method> 
                        </fence> 
                </clusternode> 
                <clusternode name="echo" votes="1"> 
                        <fence> 
                                <method name="1"> 
                                        <device name="gnbd" 
nodename="echo"/> 
                                        <device name="manual_fence" 
nodename="echo"/> 
                                </method> 
                        </fence> 
                </clusternode> 
        </clusternodes> 
        <cman expected_votes="1" two_node="1"/> 
        <fencedevices> 
                <fencedevice agent="fence_manual" name="manual_fence"/> 
                <fencedevice agent="fence_gnbd" name="gnbd" 
servers="eon"/> 
        </fencedevices> 
        <rm> 
                <failoverdomains> 
                        <failoverdomain name="oreilly_cluster_failover" 
ordered="0" restricted="0\ 
"> 
                                <failoverdomainnode name="eon" 
priority="1"/> 
                        </failoverdomain> 
                </failoverdomains> 
                <resources> 
                        <clusterfs device="/dev/volumeGroup1/gfs1" 
force_unmount="0" fsid="29490"\ 
 fstype="gfs" mountpoint="/mnt/gfs1" name="oreilly_cluster:gfs1" 
options="-j 50 -p lock_dlm"/> 
                </resources> 
                <service autostart="1" domain="oreilly_cluster_failover" 
name="gfs1"> 
                        <clusterfs ref="oreilly_cluster:gfs1"/> 
                </service> 
        </rm> 
</cluster> 
 
 
I exported/imported the file system like that: 
gnbd_export -d /dev/hdd1 -e testgfs  
gnbd_import -i eon 
mount -t gfs /dev/gnbd/testgfs /mnt/gfs1/ 
 

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