Nutanix vs OpenStack (c12n) - A strategic comparison for modern private cloud decisions
Continuing the Private Cloud Comparison Series with Nutanix vs OpenStack
Over the past few months, we have published several articles comparing OpenStack‑based private clouds with other dominant infrastructure platforms. We looked at OpenStack versus VMware, discussed the implications of vendor lock‑in, and explored why many organisations are reassessing their private cloud strategy in light of rising licensing costs, shifting roadmaps, and an increasing need for cloud‑native flexibility.
These articles all revolved around the same core question: how much control, opensourceness, and long‑term predictability do you want in your infrastructure?
A recurring theme across the past articles is that organisations are not just looking for a VMware replacement, but for a future-proof private cloud strategy. In this article, we continue that comparison series by looking at Nutanix vs OpenStack‑based clouds, such as our c12n. This comparison is particularly relevant because Nutanix is often positioned as a modern, VMware‑like alternative that promises simplicity and strong enterprise features, while OpenStack represents a fundamentally different philosophy: modular, open, and highly customisable. Both platforms can deliver a private cloud experience, but they do so in very different ways, with significant implications for architecture, operations, cost structure, and long‑term strategy.
The goal of this article is to provide clarity: how these platforms work, where their strengths lie, and in which scenarios one approach is likely to be a better fit than the other.
Understanding OpenStack-Based Clouds
OpenStack is a fully open‑source cloud platform with 15 years of development designed to manage compute, networking, and storage resources at scale. Instead of being a single, monolithic product, OpenStack is built as a collection of loosely coupled services. Organisations can deploy only the components they need, such as Nova for compute, Neutron for networking, and Cinder for block storage, and integrate them into a unified cloud control plane. (Learn more about OpenStack modular architecture here)
This modular, microservice architecture is one of OpenStack’s defining characteristics. It allows platforms like our c12n.cloud to be tailored to specific use cases, hardware setups, and operational models. The absence of licensing fees makes OpenStack financially attractive, but this does not mean it is cost‑free. Designing, deploying, and operating OpenStack requires a high level of engineering and cloud expertise. As a result, many organisations either build strong in‑house teams or rely on support from vendors such as Red Hat or Canonical.
Using community “Vanilla” OpenStack gives more flexibility and access to the latest features, but it also raises the bar for the ops teams. Upgrades, dependency management, and lifecycle operations demand deep knowledge of the platform. Despite this complexity, OpenStack remains a preferred choice for enterprises, telecom providers, and research institutions that need scalability, openness, and architectural freedom.
Understanding Nutanix
Nutanix approaches the private cloud from a different angle. It is a proprietary, subscription‑based platform built around hyperconverged infrastructure (HCI). Compute, storage, and virtualisation are tightly integrated into a single software stack that runs on hardware that should be certified (e.g. listed in Nutanix Hardware Compatibility List), with management handled through a unified control plane.
At the core of Nutanix is AHV (Acropolis Hypervisor), it is essentially a KVM‑based hypervisor optimised specifically for Nutanix environments. While Nutanix can integrate with other hypervisors, AHV is the default and preferred option. The platform is managed through Prism Central, which provides a consolidated interface for provisioning, monitoring, automation, and lifecycle management.
Nutanix’s strength lies in its focus on operational simplicity. Many infrastructure decisions are abstracted away from the operator, allowing teams to deploy and scale clusters quickly with minimal design effort. This comes at the cost of flexibility, as the platform’s architecture, update cadence, and feature set are controlled by the vendor.
OpenStack vs. Nutanix
 |
 |
|---|---|
|
Open-source cloud platform |
Proprietary HCI solution |
|
Infrastructure as a Service (IaaS) |
Hyperconverged infrastructure |
|
Compute, storage, networking |
Compute and storage |
|
Community-driven |
Commercial product |
OpenStack vs. Nutanix
One of the most fundamental differences between OpenStack and Nutanix lies in their architectural philosophy.
OpenStack follows a modular, IaaS service‑oriented architecture. Compute, networking, storage, identity, and orchestration are separate services that communicate through APIs. Such design makes it possible to scale each component independently, integrate best‑of‑breed technologies, and design architectures that match specific performance or regulatory requirements. It also allows plugging in third party vendor solutions, e.g. OpenStack supports more than 30 storage vendors including popular solutions from NetApp, Pure and Huawei. Platforms like c12n allow to run converged and hyperconverged private clouds and public clouds maximizing flexibility and being vendor-neutral.
Nutanix, by contrast, is built around a hyperconverged model. Storage and compute are co‑located on the same nodes, and scaling typically means adding identical nodes to the cluster. This results in predictable performance and simpler capacity planning, but it can be less efficient in environments where storage and compute growth patterns differ significantly, which is often the case in large enterprise or public cloud environments.
Licensing model and long‑term implications
OpenStack’s open‑source licensing eliminates software licensing fees entirely. The primary costs are the infrastructure (hardware, DC, electricity) and operations (FTEs or external support). This model offers long‑term cost transparency and avoids forced upgrades or sudden licensing changes. However, it shifts responsibility to the organisation or its chosen partner to manage complexity and ensure stability.
Nutanix, on the other hand, operates on a tiered, subscription‑based licensing model, typically offered in three editions such as Starter, Pro, and Ultimate. Higher tiers unlock additional features, which can simplify access to advanced capabilities but also increase dependence on the vendor. Over time, this dependency can translate into higher costs and reduced flexibility, particularly for organisations that scale aggressively or want to retain architectural independence.
While there is no official, across-the-board Nutanix license renewal price increase, some customers have reported significant cost increases at renewal. In some cases, these reported increases have been described as approaching 90–300% compared to previous terms. Although these reports do not represent a formal pricing policy, they highlight a risk that is highly relevant for organisations currently leaving VMware to regain cost predictability and reduce vendor dependency.
Compute and virtualization
OpenStack supports multiple hypervisors in theory, but in practice most enterprise distributions focus exclusively on KVM. While it is possible to integrate other hypervisors such as VMware vSphere or Xen, these setups often require custom configurations and come with limited feature support. For environments standardised on KVM, OpenStack offers excellent scalability and control.
Nutanix relies primarily on AHV, which is deeply integrated into the platform. AHV may not offer the same breadth of features as VMware, but it is well optimised for Nutanix workloads and reduces overall stack complexity by abstracting KVM features underneath.
Networking capabilities
OpenStack’s networking service, Neutron, is one of its most powerful components. It supports a wide range of software‑defined networking technologies, including Open vSwitch, OVN, Tungsten Fabric, Calico, and integrations with enterprise solutions like Cisco ACI or Juniper Contrail. This allows organisations to design highly flexible, yet customized network topologies that support advanced segmentation and complex routing scenarios.
Nutanix focuses on built-in networking that aligns with its HCI philosophy. Using Open vSwitch and VLAN‑based segmentation, it provides reliable and simple networking for most workloads. While sufficient for many use cases, it lacks the extensibility required for highly specialised or large‑scale network architectures that can be encountered in enterprises and telecoms.
Storage integration
OpenStack offers multiple storage services, including Cinder for block storage, Swift for object storage, and Manila for shared file systems. These services can integrate with a wide range of backends, most notably Ceph, but also NFS and enterprise storage solutions as mentioned earlier. This flexibility makes OpenStack suitable for diverse storage requirements and performance profiles.
Nutanix storage is delivered through a tightly integrated distributed file system. Features such as compression, deduplication, and tiering are built in and require minimal configuration. This results in a smooth operational experience, but limits interoperability with external storage systems and reduces customisation options.
Orchestration and automation
OpenStack includes Heat, a native orchestration engine that enables Infrastructure as Code workflows similar to AWS CloudFormation. OpenStack can also be used with tools like Terraform, OpenTofu and Ansible allowing users and admins to follow best practices with IaC automation. This makes it particularly well suited for organisations and enterprises that require deep automation, multi‑tier application orchestration, or multi‑cloud workflows.
Nutanix centralises orchestration through Prism Central, offering built‑in automation for provisioning and lifecycle management. With Nutanix Calm, the platform extends into application‑centric orchestration across hybrid and multi‑cloud environments. While powerful, these capabilities remain closely tied to the Nutanix ecosystem.
Kubernetes and cloud‑native workloads
OpenStack integrates with Kubernetes through services like Magnum and optionally external tooling. In the case of c12n we integrate Gardener instead of Magnum providing unique features for easy management of Kubernetes clusters on top of OpenStack.
Nutanix offers the Nutanix Kubernetes Engine (NKE), providing a tightly integrated Kubernetes experience within its HCI environment. This simplifies container adoption for existing Nutanix customers but reinforces platform dependency.
Nutanix vs. OpenStack at a glance
| Area |
Nutanix Cloud Platform |
OpenStack-based cloud (c12n) |
|---|---|---|
|
Core philosophy |
Simplicity through all-in-one approach |
Flexibility and scalability through modularity |
|
Architecture |
Hyperconverged |
Modular, service-oriented. HCI and non-HCI supported |
|
Licensing |
Proprietary subscription |
Open source, no license fees |
|
Vendor lock-in |
Full |
Minimal, in case of Vanilla OpenStack |
|
Networking features |
Suitable for most common private clouds |
Highly customizable, pluggable |
|
Storage flexibility |
Integrated, limited backends |
Multiple open source and 3rd party backends supported |
|
Kubernetes |
NKE, tightly integrated |
Flexible, cloud-native integrations (Magnum, Gardener and other) |
|
Best fit |
Simple VMware replacement, but with vendor lockin |
Strategic, long-term cloud platform |
Use cases and when to choose which
OpenStack is particularly well suited for large‑scale deployments in enterprises, telecommunications, research environments and any generic private clouds. Its modularity and scalability make it ideal for organisations that need custom networking, storage, or compute architectures. However, this power comes with operational complexity, often requiring skilled teams or trusted partners.
Nutanix is best suited for organisations adopting hyperconverged infrastructure and prioritising simplicity and fast deployment. It appeals to teams that want a tightly integrated hardware/software solution with predictable operations and minimal architectural freedom.
Conclusion
Exiting VMware is no longer just about replacing a hypervisor. It is about choosing the level of control, openness, and flexibility you want for the next decade of your infrastructure.
Nutanix offers a smooth transition path with strong enterprise features and reduced operational effort, but retains many characteristics of traditional vendor platforms. This includes a subscription-based licensing model where renewal costs can change unpredictably over time.
OpenStack-based clouds take a different route. By building on open-source components and avoiding proprietary licensing at the platform layer, they enable organisations to retain long-term control over costs, architecture, and upgrade timelines — even as workloads and requirements evolve.
Ultimately, the right choice depends not only on features or short-term convenience, but on strategic intent: whether you want your next platform to be easier today, or more open and predictable tomorrow.
If you are planning a VMware exit and want to understand whether an OpenStack-based private cloud like c12n is the right foundation for your organisation, talk to us. We are happy to discuss architecture options, migration paths, and what long-term openness really looks like in practice.
