Gartner says some VMware customers may find it cheaper to move certain Linux VM workloads to IBM mainframes than to adopt Broadcom's new VMware licensing, especially for fleets of hundreds of Linux VMs and mission-critical apps needing long-term stability. The Register reports: Speaking to The Register to discuss the analyst firm's mid-April publication, "The State of the IBM Mainframe in 2026," [Gartner Vice President Analyst Alessandro Galimberti] said some buyers in many fields are comparing mainframes to modern environments and deciding Big Blue's big iron comes out ahead. "I can build a multi-region cloud application, but things like data synchronization and high availability are things I need to build into application logic," he said. "The mainframe has that in the platform, which shields developers from complexity." He also thinks mainframes are ideally suited to workloads that need many years of transactional consistency and backward-compatibility.
That said, Galimberti doesn't recommend the mainframe for all applications. He said mission-critical applications that are unlikely to change much for a decade are best-suited to the machines, as are Linux applications because the open source OS runs on IBM's hardware. IBM also offers the z/VM hypervisor, which he says can make Linux "even better and more enterprise-ready." Which is why Galimberti thinks IBM's ecosystem is attractive to VMware users, especially those who operate a fleet of 500 to 700 Linux VMs. [...]
Committing to mainframes therefore means planning "to spend time negotiating price and renewal protections, rather than prioritizing the business value these solutions can deliver." Another downside is that mainframes pose clear lock-in risk, so users may hold back on useful customizations out of fear they make it harder to extricate themselves from the platform. Access to skills remains an issue, too, as kids these days mostly don't contemplate a career working with big iron. Galimberti sees more service providers investing in their mainframe programs, which might help. So does the availability of Linux.
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