I was asked this question last week while I was riding with Scoop ride sharing service.[BTW scoop is great service. If you want to try it out then use my referral code HEMANTH9AF. We both get $20 credit] We introduced each other and conversation goes like this:
Driver: what technology you work on?
Driver: what? mainframes? Are those still alive?
Me: Yeah they are still going strong and runs top industries critical data
Driver: What kind of operating system mainframes run?
Me: Mainly z/OS
That discussion promoted this post. We will look at various Operating systems that run on Mainframes
z/OS is widely used mainframe operating system. It is world most stable and secure operating system.
- z/Virtual Machine (z/VM)
z/VM creates virtual machines and runs other operating systems. Basically it creates virtual machine that any of the IBM mainframe operating systems such as z/OS, Linux for zSeries, z/VSE, and z/TPF can be run as guest systems in their own virtual machines. z/VM can run any combination of guest systems. Guest systems that z/VM provides, avoids the need for larger hardware configurations.
- z/Virtual Storage Extended (z/VSE)
z/VSE is simple,less complex version of z/OS used mostly with smaller mainframe computers. When they grow beyond the capabilities of z/VSE, they migrate to z/OS. z/VSE was originally known as Disk Operating System (DOS)
- Linux for System z
- z/Transaction Processing Facility (z/TPF)
z/TPF operating system is a special-purpose system that is used by companies with very high transaction volume, like credit card companies and airline reservation systems.
More details, check IBM knowledge center.