For readers who aren mainframe gurus, can you explain the difference between LPAR, VM, CP, and CMS?
The idea with a piece of mainframe hardware is that it’s a fairly expensive box. In most cases an organization is going to try to divide that expensive resource so that they can apply pieces to different problems simultaneously. One of the things IBM does to support its OS/390 operating system is to physically divide the system into partitions. You can assign resources like memory or I/O or CPUs into logical partitions, or LPARs. The hardware has the ability to do that. It’s fairly static. In 1964, IBM was developing a new machine, the 360/67. The hardware didn’t exist yet and they wanted to get a running start on the operating system but didn’t have any hardware to test on. They developed a simulator, in a multitasking environment, so that they could have several developers working on it at the same time and they wouldn’t have to compete for one development machine. They took a lot of care with this, and the simulation was so good that the first time the hardware appeared it was basic
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