"In the world of high-end enterprise systems, that top spot--the
world of large symmetrical processing UNIX systems--is divided
between the tier 1 systems vendors--IBM, Sun and HP. All of these
have their own proprietary architectures--IBM has POWER with AIX,
Sun has SPARC and Niagra with Solaris, and HP has the Itanium and
HPUX. Only two of these vendors, IBM and HP, are able to run
enterprise-supported versions of Linux in addition to their
proprietary Unixes on their native platforms, although Sun has
experimented in the recent past with Ubuntu on their Niagra chip, a
relationship which seems to be waning..."
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