Is OpenStack a viable VMware replacement?
Yes. OpenStack is the leading open-source alternative to VMware, powering over 45 million CPU cores across thousands of organizations worldwide — including Walmart (170,000+ cores), GEICO, AT&T, and major European enterprises. Since Broadcom's acquisition of VMware in 2023, OpenStack adoption has accelerated dramatically, with 80%+ of OpenInfra Foundation members reporting VMware migration inquiries.
This article provides a data-driven comparison to help CTOs make an informed decision.
How do OpenStack and VMware compare on features?
Both platforms provide enterprise-grade virtualization, but with fundamentally different architectures:
Compute
- VMware vSphere/ESXi — Proprietary hypervisor. Mature, well-known. Per-core licensing under Broadcom.
- OpenStack Nova/KVM — Open-source. KVM hypervisor delivers near-native performance. No per-core fees. Live migration, HA, and resource scheduling included.
Storage
- VMware vSAN — Proprietary HCI storage. Bundled with higher-tier licenses. Good performance but tied to VMware ecosystem.
- OpenStack Cinder — Block storage with pluggable backends. Most providers use Ceph (open source). PROZETA uses BlackStor — proprietary storage delivering higher IOPS and lower latency than Ceph.
Networking
- VMware NSX — Advanced SDN. Powerful but expensive. Separate license (now bundled in forced packages).
- OpenStack Neutron — Full SDN with VLAN/VXLAN support, load balancing, VPN, firewall. Included — no extra cost.
Management
- VMware vCenter — Centralized management GUI. Familiar to VMware admins. Additional license required.
- OpenStack Horizon + API — Web dashboard plus full REST API for automation. CLI tools for power users. Everything included.
How do the costs compare?
This is where the difference is most dramatic. For a typical 3-server deployment (2 CPU / 32 cores each):
VMware (Broadcom 2025/2026 pricing)
- vSphere license: ~340,000 CZK/year
- Mandatory bundled products you may not need
- Minimum 72-core purchase required
- Support contract: additional cost
- Third-party backup software: additional cost
OpenStack (PROZETA Tier5)
- Software license: 0 CZK (open source)
- Managed platform fee: predictable monthly cost
- No minimum core requirements
- 24/7 support: included
- Backup: included (with BlackStor)
What are the risks of each platform?
VMware risks (2026 context)
- Pricing unpredictability — Broadcom has shown willingness to raise prices dramatically. No guarantee of stability.
- Vendor lock-in — Proprietary formats, APIs, and tools make migration harder over time.
- Partner ecosystem shrinking — VCSP Advantage program terminated. Fewer service providers supporting VMware.
- Innovation slowdown — Post-acquisition workforce reductions. Slower product development.
- Forced bundling — Must buy products you don't need. Cannot license individual components.
OpenStack risks (managed deployment)
- Complexity if self-managed — OpenStack has a learning curve. Mitigated by using a managed provider like PROZETA.
- Smaller talent pool — Fewer OpenStack specialists than VMware admins. Again, mitigated by managed service.
- Migration effort — One-time cost and effort to migrate. Typically 4-12 weeks with professional support.
The key insight: VMware risks are ongoing and escalating. OpenStack migration risks are one-time and manageable.
What about Proxmox as an alternative?
Proxmox VE is another popular VMware alternative, particularly for smaller organizations:
- Best for: SMBs with up to ~50 employees, on-premise deployments
- Strengths: Zero license fees, simple web management, built-in backup and HA
- Limitations: Not designed for large-scale multi-tenant cloud, fewer enterprise features than OpenStack
PROZETA offers both — Proxmox VE for smaller on-premise deployments and Tier5 OpenStack for enterprise managed cloud. We recommend the right fit based on your scale and requirements.
How does PROZETA's OpenStack differ from other providers?
Not all OpenStack deployments are equal. PROZETA differentiates through:
- BlackStor storage — Our proprietary storage engine replaces Ceph with higher IOPS and lower latency. 90% of other providers use Ceph.
- Dedicated hardware — HPE enterprise servers exclusively for your workloads. No noisy neighbors.
- Own datacenter in Prague — European data sovereignty, GDPR compliance, sub-5ms latency across Central Europe.
- 8+ years production experience — Operating OpenStack since 2016. Proven operational maturity.
- ISO 27001 + ISO 9001 — Dual certification for information security and quality management.
- Regulated industry references — Fortuna, Allwyn, Alma Career (Jobs.cz) trust PROZETA with business-critical workloads.
Decision framework: Should you migrate from VMware to OpenStack?
Migrate if:
- Your VMware licensing costs have increased significantly
- You want to eliminate vendor lock-in risk
- You need European data sovereignty (GDPR)
- You value predictable, transparent pricing
- You want dedicated infrastructure (not shared public cloud)
- Your environment has 50+ VMs or complex workloads
Consider Proxmox instead if:
- You have a small environment (under 50 VMs)
- You prefer on-premise management
- You need the simplest possible solution
- Budget is the primary driver
Stay on VMware if:
- You have specific VMware-only certified applications that cannot be validated on alternatives
- Your current licensing agreement has favorable long-term pricing locked in
- Migration risk outweighs cost savings for your specific situation
What's the next step?
If you're evaluating a move from VMware, PROZETA offers a free migration assessment:
- We analyze your current VMware environment
- We estimate TCO savings with OpenStack
- We provide a detailed migration plan with timeline
- No commitment required
Contact PROZETA to schedule your free assessment, or explore our VMware Alternative page for more details.