The continuing attraction of the mainframe seems to constantly surprise commentators. Many struggle to understand how a platform that can trace its roots back more than 50 years can remain as business critical today as when it was launched. After all, the mini-computer, local area networks, distributed computing, blade systems and even supercomputers built out of gaming machines, have all attacked the mainframe from different sides. Despite all of that, it continues to survive and even evolve to address new workloads that were previously seen as unsuitable for the platform.