Hierarchical File System (IBM MVS)

IBM's Hierarchical File System (HFS) is a POSIX-style file system that IBM introduced on Feb 9, 1993 in MVS/ESA System Product Version 4 Release 3 OpenEdition[1][2] with DFSMS/MVS Version 1 Release 2[3] for 3090 mainframes. On April 6, 1994, IBM introduced MVS/ESA System Product (MVS/ESA SP) Version 5 Release 1,[4] which included MVS OpenEdition (MVS-OE), and hence HFS, as a standard component. IBM continued providing HFS through z/OS 2.4 for z System mainframes.

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 systemsincluded in all releases of z/OS and OS/390; included in MVS/ESA V5R1 and higher, optional for V4R3

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.[5]

IBM dropped HFS in z/OS 2.5.

References
  1. "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.
  2. "Hierarchical File System Usage Guide" (PDF). IBM. September 2000. Retrieved 2016-09-01.
  3. "DFSMS/MVS Version 1 Release 2". Announcement letters. IBM. March 1, 1994. 294-095. Retrieved January 28, 2022.
  4. "IBM MVS/ESA SP Version 5 Release 1 and OpenEdition Enhancements". Announcement letters. IBM. April 6, 1994. 294-152. Retrieved January 28, 2022.
  5. "HFS to zFS Migration Tool" (PDF). IBM. January 2008. Retrieved 2016-09-01.
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