a string of MVS versions. Like OS/390, z/OS combines a number of formerly separate, related products, some of which are still optional. z/OS has the attributes
commonly called MVS, is the most commonly used operating system on the System/370, System/390 and IBMZIBM mainframe computers. IBM developed MVS, along with
IBM's Hierarchical File System (HFS) is a POSIX-style hierarchical file system for the MVS/ESA/SP through z/OS operating systems. IBM introduced HFS on
Linux on IBMZ or Linux on zSystems is the collective term for the Linux operating system compiled to run on IBM mainframes, especially IBMZ / IBMzSystems