VSE (operating system)
Closed source | |
Latest release | 6.3 / May 17, 2022[1] |
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Marketing target | IBM mainframe computers |
License | Proprietary |
Official website | 21cs |
History of IBM mainframe operating systems |
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VSEn (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 z/OS and is mostly used on smaller machines.[2][3][4]
DOS/VSE was introduced in 1979 as a successor to DOS/VS; in turn, DOS/VSE was succeeded by VSE/SP version 1 in 1983, and VSE/SP version 2 in 1985.
Overview
DOS/360 originally used 24-bit addressing. As the underlying hardware evolved, VSE/ESA acquired 31-bit addressing capability.[11]
IBM released z/VSE Version 4, which requires 64-bit z/Architecture hardware and can use 64-bit real mode addressing, in 2007. With z/VSE 5.1 (available since 2011)[11] z/VSE introduced 64-bit virtual addressing and memory objects (chunks of virtual storage), that are allocated above 2 GB.
User interfaces
Job Control Language (JCL)
A Job Control Language (JCL) that continues in the positional-parameter orientation of earlier DOS systems is VSEn's batch processing primary user interface.[12][13] There is also another, special interface for system console operators.[14]
Beyond batch
VSEn, like z/OS systems, had traditionally provided
Using this method the VSEn system is able to fully exploit the native Linux TCP/IP stack.[15]
IBM recommends
Device support
VSEn can use ECKD, FBA and SCSI devices.
See also
- z/OS
- z/TPF
- z/VM
- History of IBM mainframe operating systems#DOS/VS
- History of IBM mainframe operating systems
References
- ^ a b Lisa Klemens (2022-03-25). "21st Century Software Announces VSEn V6.3". Retrieved 2022-06-09.
- ISBN 978-0738440101.
Extended (z/VSE) is popular with users of smaller mainframe computers.
- ^ "Ahead of the Pack". IBM Systems Magazine.
At the risk of oversimplification, z/VSE is similar to z/OS but relatively smaller, simpler ... cost-effective
- ^ Stedman, Craig (29 Jan 1996). "IBM teaches VM, VSE new mainframe tricks". Computerworld. 30 (5): 39.
- ISBN 978-1-885068-91-0.
- ^ Cortese, Amy (21 Aug 1989). "Militant VSE users upbeat but impatient". Computerworld. 23 (34): 17.
- ^ Ambrosio, Johanna (23 Jul 1990). "VSE gets jumpstart with sequel". Computerworld. 24 (30): 6.
- ^ "IBM z/VSE V3.1 generally available". IBM. February 1, 2005.
z/VSE continues the focus on interoperability that began with VSE/ESA Version 2 Release 5, and continued with VSE/ESA Version 2 Release 6 and VSE/ESA Version 2 Release 7
- ^ Roger Kay (January 13, 2015). "With Z Systems Refresh, IBM Reminds Us That Mainframes Remain Relevant". Forbes.
The new system — called IBM z13 and running the fastest ... this latest revision of IBM's time-hallowed product line incorporates new ... fast enough to intervene in time to avert brand damage and lost sales? Well ... What used to be "System z" is now "z Systems," with the current product being the IBM z13.
- ^ Rebecca Levesque (2021-06-01). "21st Century Software Technologies, Inc. Enters Agreement to License z/VSE Operating System and Middleware Stack From IBM". 21st Century Software. Retrieved 2022-06-09.
- ^ a b Ingolf Salm (May 7, 2012). "Virtual Addressing With z/VSE: From 24-Bit to 64-Bit". EnterpriseSystemsMedia.com.
- ^ "Introduction to the New Mainframe: IBM z/VSE Basics" (PDF). March 1, 2016.
- ^ "Storage Considerations For the Batch External Interface".
- ^ "Hints and Tips for z/VSE 5.2" (PDF).
- ^ "The z/VSE Fast Path to Linux on System z". Archived from the original on 2013-10-22. Retrieved 2013-10-16.
- ^ "z/VSE Fast Path to Linux on IBM Z" (PDF).
Both z/VSE and Linux on IBM Z run as z/VM Guests in the same z/VM-mode LPAR .... The use of a z/VM-mode LPAR is recommended.
- ^ "z/VSE SCSI Support and Migration Options" (PDF).