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# Unlocking the Power of the Mainframe: Developing modern applications on z/OS

IBM's Igor Roski shatters mainframe myths. Discover how the z/OS Open Tools initiative brings Git, Bash, and Python to the world's most reliable enterprise architecture.

- **Speakers:** Igor Todorovski
- **Event:** World Congress 2023
- **Published:** October 6, 2023
- **Duration:** 28:26
- **URL:** https://www.wearedevelopers.com/videos/764-unlocking-the-power-of-the-mainframe-developing-modern-applications-on-z-os

## Summary

IBM's Igor Roski addresses common misconceptions about mainframes, revealing how IBM Z and z/OS remain foundational to modern enterprise architecture through unmatched security, massive I/O performance, and true "zero downtime" reliability. By moving workloads closer to data, organizations can drastically reduce latency compared to distributed cloud environments. However, the historic reliance on proprietary software stacks left the platform's open-source ecosystem stagnant.

To bridge this gap, IBM launched the z/OS Open Tools initiative, aiming to elevate z/OS to a first-class development platform akin to Linux or macOS. This community-driven effort has successfully ported over 100 open-source tools—including Git, Bash, Curl, and Vim—while introducing a modern package manager (`zop`) for simplified installation. The initiative addresses unique technical hurdles such as EBCDIC-to-ASCII character encoding conversions, C runtime differences between glibc and the z/OS Language Environment, and interacting with legacy dataset file systems.

Ultimately, modernizing mainframe development allows engineers to leverage familiar languages like Python, Node.js, and Go alongside critical legacy systems. By providing community access and streamlining CI/CD build frameworks for software ports, the z/OS Open Tools Guild invites developers to contribute to the backbone of global banking, retail, and aviation infrastructure while bridging the gap between legacy reliability and modern software practices.

**Keywords:** z/OS open tools, IBM Z mainframe modernization, zero downtime architecture, quantum-safe encryption hardware, EBCDIC to ASCII conversion, z/OS language environment, legacy system modernization, mainframe performance optimization, zop package manager, open source porting challenges, RACF security isolation, dataset file systems, enterprise latency reduction, mainframe hardware redundancy, CI/CD build frameworks

## Chapters

1. **Dispelling common misconceptions about mainframes and z/OS** (00:00) — Evaluating the realities behind misconceptions about hardware costs, system agility, and user interfaces on the z/OS platform.
1. **Realities and daily prevalence of IBM Z systems** (02:17) — Exploring how mainframe systems efficiently handle billions of daily transactions across global industries without downtime.
1. **Security and resource isolation patterns on z/OS** (04:55) — Securing applications involves resource isolation, fine-grained access controls, and quantum-safe encryption functionality.
1. **High-performance data processing and IO capabilities** (07:12) — Accelerating performance requires leveraging advanced hardware caches, dedicated IO channels, and built-in data compression.
1. **Achieving zero downtime through hardware redundancy** (08:42) — Ensuring continuous availability relies on hardware redundancy and robust parallel sysplex clustering to eliminate single points of failure.
1. **Addressing the open source software gap on z/OS** (09:52) — The z/OS Open Tools initiative brings modern Linux tooling to bridge the open source software gap on mainframes.
1. **Managing open source ports using the zopen package manager** (13:04) — Installing ported open source tools is simplified via the zopen package manager for a familiar UNIX developer interface.
1. **Comparing z/OS and Linux x86 for application porting** (15:14) — Addressing application architecture requires understanding the differences in hardware capabilities and language runtimes when porting software to z/OS.
1. **Handling EBCDIC to ASCII conversion in C applications** (19:18) — Managing file tag attributes and conversion libraries resolves text encoding conflicts between ASCII applications and legacy EBCDIC data.
1. **Automating builds and getting involved with z/OS Open Tools** (22:53) — The zopen build framework orchestrates dependency management and patching for automated open source builds.
1. **Audience questions on learning resources and cloud migration** (25:19) — Additional insights cover accessing mainframe instances for learning, file system interoperability, and avoiding increased latency from cloud migrations.

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- [Analyzing COBOL mainframe migration challenges with AI](https://www.wearedevelopers.com/videos/100320-when-agents-meet-legacy-never-change-a-running-system) (from "When Agents Meet Legacy: Never Change a Running System")
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- [Modernizing legacy execution and outdated mainframes](https://www.wearedevelopers.com/videos/559-an-architect-s-guide-to-reducing-the-carbon-footprint-of-your-applications) (from "An Architect’s guide to reducing the carbon footprint of your applications")

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