The Modern Mainframe: Powering Critical IT Infrastructures


In the ever-evolving landscape of information technology, the mainframe remains a stalwart presence, driving the backbone of critical business operations for enterprises worldwide.

Despite the proliferation of cloud computing and distributed systems, the modern mainframe continues to reign supreme in certain sectors, offering unparalleled reliability, security, and scalability.

Let’s delve into the inner workings of these behemoths of computing, exploring their role in modern IT settings, the advantages they provide to businesses, and considerations for adoption and migration.

Understanding the Modern Mainframe

At its core, a mainframe is a high-performance, large-scale computer system designed to handle massive workloads and data processing tasks.

We’ve talked about mainframes elsewhere on our blog in our quick and easy guide to how mainframes work, in terms of the basics with regards to older models.

Unlike traditional servers or PCs, mainframes excel at processing transactions, managing databases, and running mission-critical applications with utmost reliability.

Modern mainframes, such as the IBM zSeries, boast advanced features like virtualization, encryption, and integration with cloud environments.

Modern Mainframe Models

In terms of modern mainframe models still in use, IBM continues to dominate the mainframe market with its zSeries mainframes.

These mainframes are utilized by a variety of businesses, including large enterprises, financial institutions, government agencies, and healthcare organizations.

IBM regularly updates its mainframe offerings to meet the evolving needs of modern IT environments.

Some of the latest and most advanced IBM mainframe models include:

IBM z15

Introduced in September 2019, the z15 is designed to provide enhanced security, privacy, and resilience for mission-critical workloads.

It incorporates advanced encryption capabilities, support for hybrid cloud environments, and improved performance for AI and analytics workloads.


This is the primary operating system used on IBM mainframes, providing a highly secure and reliable environment for running critical business applications.

IBM continuously updates z/OS with new features and enhancements to support modern IT requirements.


While not strictly a mainframe in the traditional sense, the IBM LinuxONE III is a highly scalable and secure Linux server designed for enterprise workloads.

It offers mainframe-like reliability and security features while supporting open-source software and modern development practices.


This is IBM’s virtualization technology for mainframes, allowing multiple virtual machines to run concurrently on a single physical server.

z/VM enables efficient resource utilization and workload isolation, making it ideal for cloud computing and consolidation projects.

    In addition to IBM, other vendors such as Fujitsu and Unisys also offer mainframe systems, although they have a smaller market share compared to IBM.

    Overall, modern mainframes continue to play a crucial role in supporting the IT infrastructure of large organizations, providing unmatched reliability, security, and scalability for mission-critical workloads.

    Who Uses Mainframes and Why

    Mainframes find a home in industries where reliability, security, and scalability are paramount.

    Financial institutions, healthcare providers, government agencies, airlines, and large enterprises heavily rely on mainframes to support their core business operations.

    These organizations leverage mainframes for tasks like transaction processing, database management, batch processing, and real-time analytics.

    The robust architecture of mainframes ensures uninterrupted service, even under peak loads or during hardware failures.

    Advantages of Mainframes for Businesses

    The adoption of mainframes offers several advantages to businesses:


    Mainframes are renowned for their fault-tolerant design, with redundant components and built-in failover mechanisms to ensure continuous operation.


    Mainframes provide unparalleled security features, including encryption, access controls, and audit trails, making them ideal for handling sensitive data and regulatory compliance requirements.


    Mainframes can effortlessly scale up to handle growing workloads, thanks to their modular architecture and capacity-on-demand features.


    Mainframes deliver exceptional performance for demanding workloads, with high-speed processors, large memory capacities, and optimized I/O subsystems.

    Cost Efficiency

    Despite their initial investment costs, mainframes offer long-term cost savings through efficient resource utilization, consolidation of workloads, and lower operational expenses.

    Setting Up and Managing a Mainframe

    Setting up a mainframe typically requires specialized expertise and careful planning.

    A team of skilled professionals, including system administrators, database administrators, network engineers, and security experts, is needed to deploy, configure, and maintain a mainframe environment.

    Tasks involve installing and configuring the operating system, managing storage resources, configuring network connectivity, and implementing security measures.

    Moving Away from Mainframes

    While mainframes offer unmatched reliability and performance, some organizations may consider migrating away from them due to evolving business needs, cost considerations, or technological advancements.

    Migrating from a mainframe to distributed systems or cloud platforms involves careful planning, assessing application dependencies, data migration, and ensuring minimal disruption to business operations.

    Advantages and Downsides of Mainframes


    1. Reliability and uptime
    2. Security and compliance
    3. Scalability and performance
    4. Cost efficiency over the long term


    1. High initial investment costs
    2. Complexity of management and administration
    3. Limited availability of skilled professionals
    4. Potential vendor lock-in

    Training and Space Requirements

    Operating a mainframe requires specialized training and expertise in mainframe technologies, programming languages (such as COBOL and PL/I), and mainframe-specific tools and utilities.

    Training programs offered by vendors, educational institutions, and online resources help individuals acquire the necessary skills to operate and maintain mainframe systems.

    In terms of space requirements, mainframes typically occupy dedicated data center facilities due to their size, power consumption, and cooling needs.

    Adequate space, power infrastructure, and environmental controls are essential to ensure optimal performance and reliability.

    In conclusion, the modern mainframe continues to play a vital role in supporting the complex IT infrastructures of large organizations, offering unparalleled reliability, security, and scalability.

    While migrating away from mainframes may be a consideration for some, the benefits they provide in terms of reliability, security, and performance make them indispensable for many industries.

    With the right expertise and resources, organizations can harness the power of mainframes to drive their business success in the digital age.

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