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Hierarchical File System (IBM MVS)
POSIX-style file system for IBM's z/OS and its predecessor operating systems for z System mainframes

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.

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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. 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. https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/0/897/ENUS293-060/index.html ↩

  3. "Hierarchical File System Usage Guide" (PDF). IBM. September 2000. Retrieved 2016-09-01. http://www.redbooks.ibm.com/redbooks/pdfs/sg245482.pdf ↩

  4. "DFSMS/MVS Version 1 Release 2". Announcement letters. IBM. March 1, 1994. 294-095. Retrieved January 28, 2022. https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/5/897/ENUS294-095/index.html ↩

  5. "IBM MVS/ESA SP Version 5 Release 1 and OpenEdition Enhancements". Announcement letters. IBM. April 6, 1994. 294-152. Retrieved January 28, 2022. https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/2/897/ENUS294-152/index.html ↩

  6. Shacklett, Mary E.; Bigelow, Stephen J. "What is z/OS?". TechTarget. Retrieved March 2, 2023. https://www.techtarget.com/searchdatacenter/definition/z-OS ↩

  7. IBM (January 2008). "HFS to zFS Migration Tool" (PDF). Retrieved 2016-09-01. http://www.redbooks.ibm.com/redpapers/pdfs/redp4328.pdf ↩

  8. Shacklett, Mary E.; Bigelow, Stephen J. "What is z/OS?". TechTarget. Retrieved March 2, 2023. https://www.techtarget.com/searchdatacenter/definition/z-OS ↩