IBM LinuxONE

What is IBM LinuxONE?

IBM LinuxONE is a server based on mainframe architecture, but running only Linux. It’s not a typical “big x86 server” - it’s a completely different architecture (the same as IBM Z mainframe), but instead of old banking systems it runs standard Linux (RHEL, SUSE, Ubuntu).

Why would anyone want this?

1. Consolidation - one LinuxONE replaces hundreds/thousands of x86 servers
2. Reliability - 99.9999% uptime (32 seconds of downtime per year)
3. Security - encryption of all data in hardware, without configuration
4. Scale - up to 2 million containers on one system

Who is it for?

LinuxONE is a solution for very large environments:

• Banks with thousands of Linux servers
• Stock exchanges and transactional systems
• Large data centers that want to consolidate
• Environments requiring the highest security

This is NOT a solution for:

• Typical companies with 10-100 servers (overkill)
• Startups (too expensive)
• Environments where x86 is sufficient

How does consolidation work?

Typical scenario before LinuxONE:

Data Center:
- 500 x86 servers with Linux
- 50 racks
- Hundreds of network switches
- Team of 20 people to manage
- 2 MW of power

After migration to LinuxONE:

Data Center:
- 2 LinuxONE servers (HA)
- 2 racks
- Several switches
- Team of 5 people
- 200 kW of power

Why such a big difference?

• Telum processor has more power per core than x86
• Mainframe architecture is optimized for I/O
• Virtualization (PR/SM) has almost zero overhead

How is it different from x86 servers?

Aspect	x86 Servers	LinuxONE
Scale	1 server = 1 server	1 server = 1000+ servers
Uptime	99.9% (8.7h downtime per year)	99.9999% (32s per year)
Encryption	Software, overhead	Hardware, zero overhead
Management	Hundreds of machines	One system
Unit price	Low	Very high
TCO at scale	Grows linearly	Economies of scale

99.9999% Reliability

LinuxONE has an architecture that eliminates single points of failure:

• Redundancy of everything - processors, memory, I/O, power
• Hot-swap - component replacement without shutdown
• Live firmware update - updates without restart
• Predictive failure - system informs about failure before it occurs
• Self-healing - automatic switching to backup components

Practically: Banks using mainframe/LinuxONE report years without unplanned downtime.

Pervasive Encryption

Problem with encryption on x86:

• You have to decide WHAT to encrypt
• Configuration per application/database
• Performance overhead
• Some data unencrypted “because too slow”

LinuxONE:

• Everything encrypted by default - data in memory, on disk, in transmission
• Hardware acceleration - zero overhead
• Without configuration - no need to decide what to encrypt
• Quantum-safe - preparation for quantum computers

Practically: Auditor asks “is data encrypted?” - answer is “all, automatically”.

LinuxONE Models

Model	Cores	RAM max	Containers	For whom
Emperor 4	Up to 200	40 TB	2M	Largest deployments
Rockhopper 4	Up to 65	16 TB	500K	Entry point, rack-mount

Emperor 4 - full-size mainframe Rockhopper 4 - smaller format (19” rack), easier deployment

What does LinuxONE run?

Standard Linux, so everything that runs on Linux:

• Distributions: RHEL, SUSE, Ubuntu
• Containers: Docker, Kubernetes, OpenShift
• Databases: PostgreSQL, MongoDB, MariaDB, Oracle
• Applications: Java, Node.js, Python, Go
• Monitoring: Prometheus, Grafana, ELK

Note: Architecture is s390x (not x86_64). Most open-source software is available, but check compatibility.

How much does it cost?

LinuxONE is an enterprise-scale investment:

Model	Approximate price
Rockhopper 4 (entry)	From ~$250K
Emperor 4 (full)	From ~$1M+

But TCO can be lower than x86:

• Less hardware to buy
• Less power (75% less)
• Less cooling
• Smaller management team
• Fewer per-core licenses (consolidation)

When is it profitable?

• You have >500 Linux servers to consolidate
• You pay high per-core licenses (Oracle, DB2)
• Data center is full (no space for more x86)
• Security/compliance is critical

Specifications (Emperor 4)

Processor	IBM Telum, 5.2 GHz
Cores	Up to 200
RAM	Up to 40 TB
I/O	PCIe Gen5, FICON
Containers	Up to 2 million
Distributions	RHEL, SUSE, Ubuntu

FAQ

Is LinuxONE a mainframe? Yes and no. It’s mainframe architecture (IBM Z), but dedicated exclusively to Linux. You won’t run z/OS or old COBOL applications here.

Will my Linux applications work? Most yes. Architecture is s390x - check if your software has a build for s390x (most open-source has).

Is it more expensive than x86? Per unit yes. But at large scale TCO can be lower (less hardware, power, management).

Can I start small? Rockhopper 4 is a “smaller” model, but still a large investment. This is a solution for large environments.

What about support? IBM has global 24/7 support. For mainframe/LinuxONE it’s the highest level.

Does Kubernetes work? Yes. Red Hat OpenShift is certified for LinuxONE. Vanilla Kubernetes also works.

How is it different from IBM Power? Power is a different architecture (PowerPC), runs AIX, IBM i and Linux. LinuxONE is Z architecture, Linux only.

Does nFlo deploy LinuxONE? Yes. Architecture, sizing, workload migration from x86, integration with OpenShift.