Rob Pankow 
Digital sovereignty is no longer a single product decision; it is a stack decision. Choosing a European cloud for compute does little if your storage, orchestration, and data layers still tie you to US-controlled services or proprietary lock-in. In 2026, European teams are assembling a full data infrastructure stack from sovereign, mostly open components, layer by layer. This guide walks through those layers, from compute up to data, and shows where the storage foundation sits and why it is the layer that most often makes or breaks the result.
Why a Sovereign European Data Stack in 2026
The pressure is coming from several directions at once: the EU Data Act and AI Act, concern over the US CLOUD Act, rising hyperscaler bills, and a strategic push for European technological autonomy through initiatives like Gaia-X and the Sovereign Cloud Stack. Teams are responding not by swapping one managed service for another, but by building a stack they control end to end.
A sovereign stack is not about rejecting good technology; it is about owning the architecture. Each layer should run on infrastructure under European jurisdiction, prefer open and portable components over proprietary lock-in, and expose standard interfaces so layers can be swapped without re-platforming. The table below shows the shape of the stack before we go layer by layer.
| Layer | What it does | Sovereign European options |
|---|---|---|
| Compute (IaaS) | Servers, networking, bare metal | OVHcloud, Hetzner, Scaleway, IONOS, STACKIT, Exoscale |
| AI compute | GPU clusters for training and inference | Scaleway, Nebius, Nscale, Verda |
| Orchestration | Schedules and runs workloads | Kubernetes, Red Hat® OpenShift®, SUSE Rancher, Talos |
| Storage | Persistent data foundation | simplyblock, Longhorn, Ceph, LINBIT |
| Data and databases | Stateful services and analytics | PostgreSQL, data warehouses, vector stores |
The Layers of the European Data Infrastructure Stack
Compute: European Clouds and Bare Metal
The base layer is where servers and networking live. Europe has a strong field here, from OVHcloud’s certified scale to Hetzner’s price-performance and Scaleway’s developer experience, plus German sovereign options like IONOS and STACKIT. The key architectural choice is to treat compute as interchangeable: use providers for capacity and location, but do not let any one of them own your data or your operational model. For the full comparison, see our guide to European cloud infrastructure providers.
AI Compute: Sovereign GPUs
AI has become its own layer. GPU capacity from Scaleway, Nebius, Nscale, and Verda keeps model training and inference under European control, which matters for the EU AI Act and for protecting proprietary data and weights. The same portability principle applies: the GPUs are rented capacity, while your data pipeline and storage should stay yours. We cover this layer in depth in our guide to European AI cloud providers.
Orchestration: Kubernetes and Its Enterprise Distributions
Above compute sits the platform that schedules workloads. Kubernetes is the open standard, with Red Hat® OpenShift® and SUSE Rancher as the enterprise distributions most European teams standardize on, and Talos as a lean, secure option for smaller estates. This layer is where a VMware exit usually lands: teams leave vSAN-era virtualization and rebuild on a cloud-native platform they can run anywhere.
Storage: The Foundation Everything Sits On
Orchestration moves compute around freely, but data has gravity. The storage layer is where performance, resilience, and lock-in are decided, and where many sovereign stacks quietly fail by falling back on a provider’s proprietary block service. Sovereign options range from open-source projects like Longhorn, Ceph, and LINBIT to NVMe-first platforms built for performance. For the full landscape, see our guide to European storage solutions.
Data and Databases: The Workloads That Matter
At the top sit the stateful services that justify the whole stack: PostgreSQL and other databases, analytics and data warehouses, and increasingly vector stores for AI. These are the workloads most sensitive to storage latency and most exposed to data-residency rules, which is why the layers below them have to be both fast and sovereign.
simplyblock: The Storage Foundation
simplyblock is built to be the storage foundation of exactly this stack. It is NVMe-first, software-defined block storage that runs across every compute option above, European clouds, bare metal, or your own data center, and presents one consistent, high-performance layer to the orchestration and data layers on top. That is what keeps the stack portable: you can change compute providers or add GPU capacity without re-architecting where and how your data lives.
It is engineered for the workloads that matter most in this stack. Sub-millisecond latency over NVMe over Fabrics (NVMe/TCP and NVMe/RoCE) serves demanding databases; distributed erasure coding turns up to roughly 80% of raw capacity into usable storage to control cost; copy-on-write snapshots and clones, multi-tenancy, and QoS give platform teams day-2 control; and Kubernetes-native CSI integration plus agentic-ready automation fit OpenShift, Rancher, and Talos cleanly. As a certified Red Hat® OpenShift® partner, it slots into enterprise programs with procurement confidence. The result is a storage foundation that delivers cloud-like speed and economics while keeping data fully under European control.
🚀 Building a sovereign European data stack? simplyblock is the NVMe-first storage foundation that runs across European clouds, bare metal, and on-prem, keeping your data fast, efficient, and under your control. 👉 See the simplyblock storage architecture
Assembling Your Stack
You do not have to build all five layers at once. Most teams start where the pain is sharpest, usually a VMware exit at the orchestration and storage layers, and expand outward. The mapping below shows a coherent sovereign path through the stack.
| Layer | Pragmatic European choice | Why it holds the stack together |
|---|---|---|
| Compute | OVHcloud or Hetzner | EU jurisdiction, no CLOUD Act exposure, interchangeable capacity |
| AI compute | Scaleway or Nebius | Sovereign GPUs without shipping data to hyperscalers |
| Orchestration | OpenShift or Rancher | Portable platform that runs the same on any compute |
| Storage | simplyblock | One NVMe-first layer across all compute, no proprietary lock-in |
| Data | PostgreSQL and friends | Fast, sovereign stateful services on a controlled foundation |
Bottom Line
A sovereign European data infrastructure stack in 2026 is achievable with mature, mostly open components: European clouds and GPUs for compute, Kubernetes distributions for orchestration, and a controlled storage foundation tying it together. Storage is the layer that decides whether the stack is genuinely portable and performant or quietly locked in. simplyblock is built to be that foundation, an NVMe-first, software-defined layer that runs across the whole European stack while keeping data under your control.
Questions and Answers
What is a sovereign European data infrastructure stack? It is a full set of infrastructure layers, compute, AI compute, orchestration, storage, and data, assembled from components under European jurisdiction and built to avoid proprietary lock-in. The goal is to own the architecture end to end so no single US-controlled service governs where your data lives or how your platform runs. simplyblock typically serves as the storage foundation that keeps the stack portable across the other layers.
Where should a team start when building this stack? Usually at orchestration and storage, because that is where a VMware exit lands and where lock-in hurts most. Standardizing on Kubernetes, OpenShift, or Rancher gives you a portable platform, and pairing it with a software-defined storage layer such as simplyblock means you can then choose or change compute providers freely without re-architecting the data path.
Why is storage the make-or-break layer? Because compute is interchangeable but data has gravity. Orchestration can move workloads anywhere, but if storage is a provider’s proprietary block service, you are locked in and exposed to its latency and pricing. A sovereign, portable storage foundation like simplyblock lets the rest of the stack stay flexible while keeping performance high and data under European control.
Can this stack run across more than one provider or on-prem? Yes, and that is the point of building it from portable components. European clouds provide interchangeable compute, Kubernetes provides a portable platform, and a software-defined storage layer such as simplyblock runs on bare metal, cloud instances, and on-prem alike. That combination lets you spread workloads across providers and your own data center without re-platforming.
How does this relate to Gaia-X and the Sovereign Cloud Stack? Gaia-X and the Sovereign Cloud Stack are European initiatives defining standards and reference architectures for sovereign infrastructure. The stack described here is a practical, product-level expression of the same goals: open interfaces, European jurisdiction, and no lock-in. Choosing components that follow those principles, including an open, software-defined storage foundation, keeps you aligned with where European infrastructure standards are heading.
