Get information about the KBs on the cluster, and running ones visible to
When the name of a KB is given,
prints the disk space used on each node in the cluster.
When run without arguments it prints the KBs that have been created on the
cluster, followed but the ones that are currently running.
This command depends on the config file /etc/4s-cluster, see 4s-cluster
If you do not have Avahi support (ie. clustering is not enabled) then you will
not be able to see the list of running KBs on the cluster.