Since we run Qemu as unprivileged user we have to permit access to GlusterFS from an unprivileged port as well as an unprivileged user.
To achieve that, add the following line to the <code>volume management</code> in <code>/etc/glusterfs/glusterd.vol</code> on all involved storage nodes and restart glusterd:
<pre>
option rpc-auth-allow-insecure on
<pre>
gluster volume set virtualization server.allow-insecure On
</pre>
After that you should at least restart <code>glusterd</code>:
<pre>
/etc/init.d/glusterd restart
</pre>
But it seems that one also has to restart all <code>glusterfsd</code> daemons by restarting the volume. So, do the following on a GlusterFS node:
<pre>
gluster volume stop virtualization
gluster volume start virtualization
</pre>