VSE (operating system)

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z/VSE
Company / developer	IBM
OS family	DOS/360 and successors
Working state	Current
Source model	Closed source
Latest stable release	IBM z/VSE V4.1.1/ November 30, 2007
Marketing target	IBM mainframe computers
License	Proprietary
Website	z/VSE

History of IBM mainframe
operating systems

IBSYS 1950s
CTSS 1961
BOS/360 1965
TOS/360 1965
TSS/360 1967
MUSIC/SP 1960s
MTS 1970s

DOS/360 and successors 1966
- DOS/VS 1972
- DOS/VSE 1980s
- VSE/ESA 1991
- z/VSE 2005

OS/360 and successors 1966
- MFT 1966
  - OS/VS1 1972
- MVT 1967
  - OS/VS2R1 (SVS) 1972
- MVS (OS/VS2R2) 1974
  - MVS/370 1970s
  - MVS/XA 1980s
  - MVS/ESA 1988
  - OS/390 1995
  - z/OS 2000

VM line
- CP-40 /CMS 1967
- CP-67 /CMS 1967
- VP/CSS 1968
- VM/370 1972
- VM/SP 1980
- VM/XA 1988
- VM/ESA 1990
- z/VM 2000

TPF line
- ACP 1967
- TPF 1979
- z/TPF 2000s

Unix-like on IBM mainframes
- UTS 1981
- AIX/370 1990
- AIX/ESA 1991
- Linux 1999
- OpenSolaris 2008

z/VSE (Virtual Storage Extended) is an operating system for IBM mainframe computers, the latest one in the DOS/360 lineage, which originated in 1965. It is less common than prominent z/OS and is mostly used on smaller machines. Primary z/VSE development occurs in IBM's Böblingen labs in Germany.

1 Overview
2 Older z/VSE versions
3 See also
4 References
5 External links

Overview

VSE originally supported 24-bit addressing. As the underlying hardware evolved, VSE acquired support for 31-bit addressing. IBM released z/VSE Version 4 in 2007. z/VSE Version 4 requires 64-bit z/Architecture hardware and supports 64-bit real mode addressing. The latest shipping release (as of October, 2008) is z/VSE 4.2.

IBM recommends that z/VSE customers run Linux on zSeries alongside, on the same physical system, to provide another 64-bit application environment that can access and extend z/VSE applications and data via Hipersockets using a wide variety of middleware. CICS, one of the most popular enterprise transaction processing systems, is extremely popular among z/VSE users and now supports recent innovations such as Web services. DB2 is also available and popular.

Job Control Statements (JCS) is z/VSE's batch processing interface. There is also another, special interface for system console operators. z/VSE, like z/OS systems, had traditionally supported 3270 terminal user interfaces. However, most z/VSE installations have at least begun to add Web browser access to z/VSE applications. z/VSE's TCP/IP is a separately priced option for historic reasons, and is available in two different versions from two vendors.^[clarify]

Older z/VSE versions

Since z/VSE 3.1, Fibre Channel access to storage devices is supported, although only on IBM's Enterprise Storage Server (ESS) and its successors. z/VSE 3.1 is still compatible with 31-bit mainframes, as opposed to z/VSE 4. This version will be supported to 2009.^[1]

A previous generation, VSE/ESA 2.7, is no longer supported since 28-02-2007.^[1]

References

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