What are some factors to consider in evaluating the potential return (ROI) of Unix-to-Linux migration?
Palmer: For many organizations, software and training issues are central to evaluating the ROI. Software is what adds value to an organization and it feeds user productivity. Central to any migration is determining which software applications are vital. Can those applications be ported to Linux? In some cases, important applications are proprietary to a specific Unix vendor or to a specific commercial Unix operating system, which means they cannot be ported or the cost of porting is prohibitive. If the migration involves major changes to existing software, it is important to have a realistic cost estimate of the changes and a timeline. Some organizations add a third of the estimated cost to the total as a safety factor. If new software is needed, the cost of that software should be determined — including the time spent evaluating the software. Beyond software costs, there are costs for retraining users. There is also the issue of finding migration tools and how much they cost. Another
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