ZOS
| Developer | IBM |
|---|---|
| Written in | primarily PL/X, HLASM, and C/C++ |
| OS family | z/OS |
| Working state | Current |
| Source model | Mostly closed source |
| Initial release | March 30, 2001 (V1R1, announced October, 2000) |
| Latest release | Version 2.2 (V2R2) / June 28, 2015 |
| Marketing target | Enterprise / Mainframes |
| Available in | English and other languages |
| Package manager | SMP/E |
| Platforms | z/Architecture |
| Kernel type | Monolithic (uniquely hardware-assisted) |
| Default user interface | ISPF, z/OS Management Facility |
| License | Proprietary monthly license charge (MLC); pricing available based on actual use (VWLC, EWLC, AWLC, EAWLC, IWP); reduced pricing options (zELC, zNALC, "Solution Edition") for many applications |
| Official website | IBM: z/OS |
z/OS is a 64-bit operating system for IBM mainframes, produced by IBM. It derives from and is the successor to OS/390, which in turn followed a string of MVS versions. Like OS/390, z/OS combines a number of formerly separate, related products, some of which are still optional. z/OS offers the attributes of modern operating systems but also retains much of the functionality originating in the 1960s and each subsequent decade that is still found in daily use (backward compatibility is one of z/OS's central design philosophies). z/OS was first introduced in October 2000.
z/OS supports stable mainframe systems and standards such as CICS, COBOL, IMS, DB2, RACF, SNA, WebSphere MQ, record-oriented data access methods, REXX, CLIST, SMP/E, JCL, TSO/E, and ISPF, among others. However, z/OS also supports 64-bit Java, C, C++, and UNIX (Single UNIX Specification) APIs and applications through UNIX System Services – The Open Group certifies z/OS as a compliant UNIX operating system – with UNIX/Linux-style hierarchical HFS and zFS file systems. As a result, z/OS hosts a broad range of commercial and open source software. z/OS can communicate directly via , including IPv6, and includes standard HTTP servers (one from Lotus, the other Apache-derived) along with other common services such as FTP, , and CIFS/SMB. Another central design philosophy is support for extremely high quality of service (QoS), even within a single operating system instance, although z/OS has built-in support for Parallel Sysplex clustering.
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