ZFS (IBM file system)
Encyclopedia
zFS refers to two different IBM file system
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Neither file system has any relation to Oracle/Sun's ZFS
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File system
A file system is a means to organize data expected to be retained after a program terminates by providing procedures to store, retrieve and update data, as well as manage the available space on the device which contain it. A file system organizes data in an efficient manner and is tuned to the...
s:
- zFS most often refers to z/OS Distributed File Service zSeriesZSeriesIBM System z, or earlier IBM eServer zSeries, is a brand name designated by IBM to all its mainframe computers.In 2000, IBM rebranded the existing System/390 to IBM eServer zSeries with the e depicted in IBM's red trademarked symbol, but because no specific machine names were changed for...
File System, the newest POSIX-style hierarchical file system for IBM's z/OSZ/OSz/OS is a 64-bit operating system for mainframe computers, produced by IBM. It derives from and is the successor to OS/390, which in turn followed a string of MVS versions.Starting with earliest:*OS/VS2 Release 2 through Release 3.8...
operating systemOperating systemAn operating system is a set of programs that manage computer hardware resources and provide common services for application software. The operating system is the most important type of system software in a computer system...
, a successor to that operating system's HFSHierarchical File SystemHierarchical File System is a file system developed by Apple Inc. for use in computer systems running Mac OS. Originally designed for use on floppy and hard disks, it can also be found on read-only media such as CD-ROMs...
. zFS, as a separate entity, was initially released as PTFs (patches) for z/OS 1.2 with backports available for z/OS 1.1 and OS/390 2.10. Beginning with z/OS 1.3, zFS is included as a standard feature and is being actively developed. However, zFS was actually first released in 1995 as the Local File SystemEpisode filesystemEpisode is a POSIX compliant file system most commonly known for its use in DCE/DFS file servers. It was designed to achieve the goals of portability, scaling, and to make more efficient use of available system bandwidth...
, a lower layer of the DCEDistributed Computing EnvironmentThe Distributed Computing Environment is a software system developed in the early 1990s by a consortium that included Apollo Computer , IBM, Digital Equipment Corporation, and others. The DCE supplies a framework and toolkit for developing client/server applications...
Distributed File SystemDCE Distributed File SystemThe DCE Distributed File System is the remote file access protocol used with the Distributed Computing Environment. It was based on the AFS Version 3.0 protocol that was developed commercially by Transarc Corporation...
. It was available on MVS/ESA V5R2.2 and all OS/390OS/390OS/390 is an IBM operating system for the System/390 IBM mainframe computers.OS/390 was introduced in late 1995 in an effort, led by the late Randy Stelman, to simplify the packaging and ordering for the key, entitled elements needed to complete a fully functional MVS operating system package...
releases. DFS/LFS was provided as a part of the DCE feature, not of the base operating system as in z/OS.
- zFS was also an IBM research project to develop a distributed, decentralized file system. It was a follow-on to the IBM DSF (Data Sharing Facility) project to build a serverless file system.
Neither file system has any relation to Oracle/Sun's ZFS
ZFS
In computing, ZFS is a combined file system and logical volume manager designed by Sun Microsystems. The features of ZFS include data integrity verification against data corruption modes , support for high storage capacities, integration of the concepts of filesystem and volume management,...
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