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The cluster depends on a number of servers.
`uhhpc` -- our administrative login machine. This runs
the job control systems, the system that forwards ssh
connections to headnode1 or headnode2, the web server,
a MariaDB server, and the LDAP server which controls
user accounts. If it goes down the system is probably unusable.
`headnode1` -- normal user login machine 1, serves /home.
If it goes down the cluster is not usable for normal users.
`headnode2` -- normal user login machine 2, serves /soft
and runs some licence servers. Software won`t be available if this goes down.
`stri-server` -- legacy main NFS server. If it goes down
some NFS volumes won`t be available.
`lofar-server` aka lofar.herts.ac.uk. Login machine for
LOFAR-UK users. Serves /data/lofar. If it goes down LOFAR users will complain.
`cair-cluster` aka cair-cluster.herts.ac.uk. Login machine and
server for CACP (formerly CAIR) users. If it goes down those users will complain.
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