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z/OS and z/VSE Comparison

The future runs on System z. z/OS and z/VSE Comparison. G. M. (Jerry) Johnston p798000@us.ibm.com Senior Advisor – Boeblingen Lab. Operating Systems on IBM System z. ~ 1/3 traditional mainframe operating systems installed worldwide are VSE*

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z/OS and z/VSE Comparison

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  1. The future runs on System z z/OS and z/VSE Comparison G. M. (Jerry) Johnston p798000@us.ibm.comSenior Advisor – Boeblingen Lab

  2. Operating Systems on IBM System z • ~ 1/3 traditional mainframe operating systems installed worldwide are VSE* • VSE* distributed ~ 40% in Americas, 40% Europe, 20% Rest of World • Worldwide ~ 50% run VSE under VM. Higher in Europe and higher for larger servers • IFLs play an important role in z/VSE strategy • zIIP/zAAP have no meaning to z/VSE (*) The term “VSE” stands for both z/VSE & VSE/ESA .

  3. 1970s 1990s 1960s 2000s 1980s 40+ Years of IBM Mainframe & VSE Evolution • S/360->S/370->4300->9370->ES9000->S/390->zSeries->z9->z10 • S/360 Model 30 • 30 KIPS (.03 MIPS) • 16 – 64 KB • DOS/360 ->DOS/VS->DOS/VSE->(SSX)->VSE/SP ->VSE/ESA V1->VSE/ESA V2->z/VSE V3-> zVSE V4 • System z9 BC • 26-480 MIPS (1-way) • 8 –64 GB • z/VSE V4.1 • Batch and OLTP • SOA • still lovable • DOS/360 • 1 batch partition • basic, but lovable

  4. Environment What is VSE? • Traditional mainframe operating system, similar to z/OS but smaller and simpler. Less capacity, availability, security. No UNIX system services • Designed for smaller accounts with less demanding needs Why do customers use VSE? • Cost-efficient, high performance, robust (little downtime) • Customers have a significant cumulative investment in proven, highly evolved homegrown core VSE application code, data, equipment, IT skills, company & industry expertise, business processes, and end-user training • Familiarity, comfort, confidence What are VSE customer’s biggest concerns? • Cost!! (or at least the perception of high mainframe costs) • Applications!! (no Java, WAS, DB2 UDB, Oracle, SAP, etc.) • Skills! (especially future availability of new mainframe skills) • Security / Integrity / Resiliency (keeping auditors happy) Why not just migrate to another platform? • Cost, time, risk, lost opportunity – not an easy task • z/OS: cost, skills, benefits perceived to be marginal • AIX, Windows, or i5/OS:complete redesign and rewrite of tailored, homegrown VSE applications often requiredand/or packaged applications may be costly and not meet customer requirements (*) The term “VSE” stands for both, VSE/ESA and z/VSE.

  5. z/OS z/VSE Linux on System z z/OS and z/VSE Overview

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