| Computer Desktop Encyclopedia: DOS/VSE |
(Disk Operating System/Virtual Storage Extended) An IBM multiuser, multitasking operating system that was widely used on IBM's 43xx series. It used to be called DOS, but due to the abundance of DOS PCs, was later renamed VSE. It continues today as z/VSE. See DOS.
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| Wikipedia: VSE (operating system) |
| 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 |
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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.
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DOS/360 originally supported 24-bit addressing. As the underlying hardware evolved, VSE/ESA 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 Language (JCL) 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.[clarification needed]
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]
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