1. The quick start page at http://www.gluster.org/documentation/quickstart/ is missing a step. After creating the Gluster volume, it should be started:
sudo gluster volume start testvol
2. The mount command is missing a mount point. Currently the quick start says:
mount -t glusterfs node01:/testvol
AFAIK this should be:
mount -t glusterfs node01:testvol /mnt/gluster
3. Minor issue, but 'rep 2 transport tcp' could be left out when creating the volume.