rais

from The Collaborative International Dictionary of English v.0.48

Rais \Rais\ (r[imac]s), n.
   Same as 2d {Reis}.
   [1913 Webster]

from The Collaborative International Dictionary of English v.0.48

Reis \Reis\ (r[imac]s), n. [Ar. ra["i]s head, chief, prince.]
   A common title in the East for a person in authority,
   especially the captain of a ship. [Written also {rais} and
   {ras}.]
   [1913 Webster]

from The Free On-line Dictionary of Computing (8 July 2008)

Redundant Array of Inexpensive Servers
RAIS

   <architecture> (RAIS) The use of multiple {servers} to provide
   the same service in such a way that service will still be
   available if one or more of the servers fails.  The term may
   or may not imply some kind of {load balancing} between the
   servers.  See {cluster}.

   The term "RAIS" follows {RAID}, which describes schemes for
   resilient disk storage.

   (2007-02-28)