Hierarchical File System (IBM MVS)

In the world of Hierarchical File System (IBM MVS), there is a wide range of information, opinions and perspectives that intertwine to shape understanding and knowledge on this topic. From history to the present, Hierarchical File System (IBM MVS) has played a significant role in different fields, arousing the interest of experts, enthusiasts and the curious alike. Over time, it has been debated, studied and analyzed in various ways, allowing for a more complete and detailed view of Hierarchical File System (IBM MVS). In this article, we will explore the many facets of Hierarchical File System (IBM MVS), examining its origins, impact, and relevance in the present, with the goal of providing a comprehensive perspective on this fascinating topic.

This article is about HFS in MVS. For HFS in MacOS, see Apple HFS. For other, see HFS (disambiguation).
HFS
Developer(s)IBM
Full namez/OS Hierarchical File System
Introduced1993 with DFSMS/MVS Version 1.2 for MVS/ESA
Other
Supported
operating systems		included in z/OS (until 2.5), all releases of OS/390, and MVS/ESA V5R1 and higher (optional for V4R3)

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 February 9, 1993 in MVS/ESA System Product Version 4 Release 3 OpenEdition 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) with HFS as a standard component. IBM continued providing HFS through z/OS 2.4 for z System mainframes.

IBM functionally stabilized HFS starting with z/OS 1.7, in 2005. The z/OS File System (zFS) was released as the higher performance successor to HFS in 1995, and IBM recommended migration from HFS to zFS. Following the release of zFS, z/OS releases included a tool, BPXWH2Z, to convert HFS to zFS.

IBM dropped the use of HFS in z/OS 2.5, in 2021.

References

  1. ^ Hoskins, Jim; Frank, Bob (2003). Exploring IBM EServer ZSeries and S/390 Servers: See Why IBM's Redesigned Mainframe Computer Family Has Become More Popular Than Ever!. Maximum Press. ISBN 978-1-885068-91-0.
  2. ^ "OPENEDITION SERVICES ON MVS/ESA SP VERSION 4 RELEASE 3 ANNOUNCED AND AVAILABILITY OF MVS/ESA SP VERSION 4 RELEASE 3 WITH ADDITIONAL ENHANCEMENTS". Announcement letters. IBM. February 9, 1993. 293-060. Retrieved January 28, 2022.
  3. ^ "Hierarchical File System Usage Guide" (PDF). IBM. September 2000. Retrieved 2016-09-01.
  4. ^ "DFSMS/MVS Version 1 Release 2". Announcement letters. IBM. March 1, 1994. 294-095. Retrieved January 28, 2022.
  5. ^ "IBM MVS/ESA SP Version 5 Release 1 and OpenEdition Enhancements". Announcement letters. IBM. April 6, 1994. 294-152. Retrieved January 28, 2022.
  6. ^ a b Shacklett, Mary E.; Bigelow, Stephen J. "What is z/OS?". TechTarget. Retrieved March 2, 2023.
  7. ^ IBM (January 2008). "HFS to zFS Migration Tool" (PDF). Retrieved 2016-09-01.
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