Numerous papers have discussed server consolidation in the last few years. The articles illustrate a renewed interest in the mainframe and make a clear financial case for server consolidation and for moving applications to the mainframe. The bottom line is that the initial cost of a mainframe is often counter-balanced and outweighed by long-term profitability. This especially applies to Linux on the mainframe.
If you are considering a project that involves Linux, you will already have a good idea of the business value to your company. To assess the return on investment for the project, you will need to balance the value against the total cost of ownership (TCO). This chapter discusses these questions: