IBM's Hierarchical File System (HFS) is a

POSIX The Portable Operating System Interface (POSIX) is a family of standards specified by the IEEE Computer Society for maintaining compatibility between operating systems. POSIX defines both the system- and user-level application programming inte ...

-style file system that IBM introduced on Feb 9, 1993 in

MVS/ESA Multiple Virtual Storage, more commonly called MVS, was the most commonly used operating system on the System/370 and System/390 IBM mainframe computers. IBM developed MVS, along with OS/VS1 and SVS, as a successor to OS/360. It is unrelated ...

System Product Version 4 Release 3

OpenEdition OpenEdition may refer to: * OpenEdition MVS, the original name of UNIX System Services * OpenEdition Shell and Utilities Feature for VM/ESA VM (often: VM/CMS) is a family of IBM virtual machine operating systems used on IBM mainframes ...

with DFSMS/MVS Version 1 Release 2 for 3090 mainframes. On April 6, 1994, IBM introduced MVS/ESA System Product (MVS/ESA SP) Version 5 Release 1, which included MVS OpenEdition (MVS-OE), and hence HFS, as a standard component. IBM continued providing HFS through

z/OS z/OS is a 64-bit operating system for IBM z/Architecture mainframes, introduced by IBM in October 2000. It derives from and is the successor to OS/390, which in turn was preceded by a string of MVS versions.Starting with the earliest: ...

2.4 for z System mainframes. IBM functionally stabilized HFS starting with z/OS 1.7. The z/OS File System (zFS) is the higher performance successor to HFS, and IBM recommends migration from HFS to zFS. z/OS includes a tool, BPXWH2Z, to convert HFS to zFS. IBM dropped HFS in z/OS 2.5.

References

Disk file systems IBM file systems IBM mainframe operating systems {{Compu-storage-stub