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The Jefferson Lab Accelerator Controls Environment (ACE) was almost uniformly based on an HP-UX Unix environment from 1987 through the summer of 2004. During this period the ACE Control Room underwent a major renovation which included introducing Redhat Enterprise Linux machines, first as specialized process servers and then gradually as general login servers. As computer programs and scripts required to run the accelerator were modified, and inherent problems with the HP-UX platform compounded, more development tools became available for use with Linux and the ACE Control Room began to be converted over to Linux. In May 2008 the last HP-UX Unix login machine was removed from the ACE Control Room, leaving only a few Unix-based remote-login servers still available. This presentation will explore the process of converting an operational Control Room environment from the HP-UX to Linux platform as well as the many hurdles that had to be overcome throughout the transition period (including a discussion of why the process took over four years). It will conclude with a current assessment of the change-over status as well as an examination of what future steps will complete the project.
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