|OS family||DOS/360 and successors|
|Source model||Closed source|
|Latest release||IBM z/VSE V6.2 / December 1, 2017 |
|Marketing target||IBM mainframe computers|
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. Announced Feb. 1, 2005 by IBM as successor to VSA/ESA 2.7, then-new z/VSEwas named to reflect the new "System z" branding for IBM's mainframe product line.
IBM released z/VSE Version 4, which requires 64-bit z/Architecture hardware and supports 64-bit real mode addressing, in 2007. With z/VSE 5.1 (available since 2011) z/VSE introduced 64 bit virtual addressing and memory objects (chunks of virtual storage), that are allocated above 2 GB. The latest shipping release is z/VSE 6.2.0 - available since December 2017, which includes the new CICS Transaction Server for z/VSE 2.2.
A Job Control Language (JCL) that continues in the positional-parameter orientation of earlier DOS systems is z/VSE's batch processing primary user 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. Both vendors provide a full function TCP/IP stack with applications, such as telnet and FTP. One TCP/IP stack provides IPv4 communication only, the other IPv4 and IPv6 communication. In addition to the commercially available TCP/IP stacks for z/VSE, IBM also provides the Linux Fastpath method which uses IUCV socket or Hipersockets connections to communicate with a Linux guest, also running on the mainframe.
Using this method the z/VSE system is able to fully exploit the native Linux TCP/IP stack.
IBM recommends that z/VSE customers run Linux on z Systems 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.
z/VSE supports ECKD as well as SCSI devices. Fibre Channel access to SCSI storage devices was initially supported by z/VSE 3.1 on a limited basis (including on IBM's Enterprise Storage Server (ESS), IBM System Storage DS8000, DS6000 series), but the limitations disappeared with 4.2 (thus including IBM Storwize V7000, V5000, V3700 and V9000).
The last VSE/ESA release - VSE/ESA 2.7 - is no longer supported since February 28, 2007. z/VSE 3.1 was the last release, that was compatible with 31-bit mainframes, as opposed to z/VSE Version 4, 5 and 6. z/VSE 3.1 was supported to 2009. z/VSE Version 4 is no longer supported since October 2014 (end of service for z/VSE 4.3).
For VSE/ESA, DOS/VSE, VSE/SP, see History of IBM mainframe operating systems#DOS/VS
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
IBM WebSphere MQ for z/VSE V3.0.0 is a new member of the WebShere MQ family of messaging products. It is a replacement for MQSeries for VSE/ESA V2.1.2.
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.
Extended (z/VSE) is popular with users of smaller mainframe computers.
At the risk of oversimplification, z/VSE is similar to z/OS but relatively smaller, simpler ... cost-effective
IBM z/VSE V6.2 is capable as of December 1, 2017 ...
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.