> Linux can run on those mainframes (maybe on top of zOS, I'm not sure) z/OS has its own Unix Subsystem (Unix System Services, formerly known as MVS Open Editi

> Linux can run on those mainframes (maybe on top of zOS, I'm not sure) z/OS has its own Unix Subsystem (Unix System Services, formerly known as MVS Open Edition or something like that). Linux can run either in an LPAR or on top of VM inside a virtual machine - I think I read somewhere that the latter is far more common, because people that run Linux on zSeries tend to use it for replacing lots of smaller servers rather than a few big ones.