IBM launches new single-frame and rack-mount configurations for its z17 and LinuxONE 5 portfolio. This is the first time IBM is offering rack-mount systems alongside single-frame systems across the full Z and LinuxONE lineup.
The company said the new configurations are aimed at organizations that need more deployment flexibility without changing the core performance, security and ecosystem characteristics of the platform.
According to IBM, the new systems are intended to help enterprises place infrastructure where it fits best in their data centers, including environments with tighter space requirements.
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The new lineup includes IBM z17 single-frame and rack-mount systems, IBM LinuxONE Rockhopper 5, and IBM LinuxONE 5 Express. The company described LinuxONE 5 Express as a compact 18U configuration for organizations supporting a smaller set of workloads.
The z17 and LinuxONE 5 configurations support up to 82 cores and 18 TB of memory across two processor drawers. The company said that represents about a 20% increase in core count and a 12% increase in memory capacity. The z17 ME2 single-processor configuration delivers 10% greater throughput per core than the z16 A02, although results vary by workload and configuration.
IBM said the new z17 single-frame and rack-mount systems, along with LinuxONE Rockhopper 5 and LinuxONE 5 Express, will be generally available on August 12, 2026. IBM Infrastructure Management for IBM Z and IBM LinuxONE is set for August 14, 2026, and IBM COBOL Elevate for z/OS for September 18, 2026.
The z17 single-frame option ships as a complete enclosed unit in an IBM rack with intelligent power distribution units, while the rack-mount version lets clients install IBM Z components directly into an industry-standard rack. IBM said both approaches are meant to make co-location with other technologies easier.
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For LinuxONE, Rockhopper 5 keeps on-chip AI acceleration, confidential computing and post-quantum cryptography in both single-frame and rack-mount configurations.
For enterprises, this is less about a new class of mainframe and more about making an existing platform easier to place in modern data centers. By adding rack-mount and single-frame options across z17 and LinuxONE 5, IBM is trying to give customers more room to fit mainframe computing into existing infrastructure plans.
The number of mission-critical workloads is rising at an incredible pace, forcing organizations to make tough decisions about performance, AI integration, and infrastructure footprint,” said Tom McPherson, General Manager, IBM Z and LinuxONE. “With these new IBM Z and IBM LinuxONE systems, we’re making it easier to run workloads where they make the most sense, while opening the door for a wider range of organizations to benefit from these technologies for the first time.
