IBM _`® p5 servers are innovative NIX® and Linux® operating system servers with mainframe-inspired eliability, availability and security capabilities. They are designed for an on demand environment and can tackle diverse tasks ranging from complex engineering design to mission-critical ERP, SCM, CRM, transaction processing and Web serving all the way to massively parallel clustered HPC and BI solutions.
For UNIX® and Linux® users who demand powerful, flexible, reliable and
secure computing systems that meet today and tomorrow’s business
needs, IBM  ® p5 and pSeries® servers deliver excellent overall value
through technologies that enable you to do more with a single system than
ever before.