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IBM's Hierarchical File System (HFS) is a POSIX-style hierarchical file system [1] 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 [ 2 ] [ 3 ] with DFSMS/MVS Version 1 Release 2 [ 4 ] for 3090 mainframes.
A hierarchical file system contrasts with a flat file system, where information about all files is stored in a single directory, and there are no subdirectories. Almost all file systems today are hierarchical. What is referred to as a file system is a specific instance of a hierarchical system.
HFS – Hierarchical File System in IBM's MVS from MVS/ESA OpenEdition through z/OS V2R4; not to be confused with Apple's HFS. IBM stated that z/OS users should migrate from HFS to zFS, and in z/OS V2R5 dropped support for HFS. HFS – Hierarchical File System, in use until HFS+ was introduced on Mac OS 8.1. Also known as Mac OS Standard format.
It included about 1 million new lines of code, which provide an API shell, utilities, and an extended user interface. Works with a hierarchical file system provided by DFSMS (Data Facility System Managed Storage). The shell and utilities are based on Mortice Kerns' InterOpen products. Independent specialists estimate that it was over 80% open ...
In practice, HSM is typically performed by dedicated software, such as IBM Tivoli Storage Manager, or Oracle's SAM-QFS. The deletion of files from a higher level of the hierarchy (e.g. magnetic disk) after they have been moved to a lower level (e.g. optical media) is sometimes called file grooming. [2]
In 1972 IBM announced the first release of the OS/VS2 operating system for the IBM System 370 systems; that release later was known as Single Virtual Storage . In 1974 IBM announced release 2.0; that release and all subsequent releases became known as Multiple Virtual Storage . All releases of OS/VS2 were available to no charge because the ...
Hierarchical file system, a system for organizing directories and files; Hierarchical File System (Apple), a file system introduced in 1985 for the classic Mac OS; Hierarchical File System (IBM MVS), a file system introduced in 1993 for MVS/ESA and subsequent operating systems; Hi Performance FileSystem, a file system used by the HP-UX ...
The hierarchical structure is used primarily today for storing geographic information and file systems. [citation needed] Currently, hierarchical databases are still widely used especially in applications that require very high performance and availability such as banking, health care, and telecommunications.