Why are companies migrating from VMware to OpenStack in 2026?
Broadcom's acquisition of VMware has fundamentally changed the economics of VMware infrastructure. With average license price increases of 150%+, elimination of perpetual licenses, and forced 72-core minimum bundles, organizations are actively seeking alternatives. OpenStack has emerged as the leading enterprise-grade replacement, powering over 45 million cores worldwide.
Pro-zeta has been operating production OpenStack clouds since 2016. This guide distills 8+ years of migration experience into a practical playbook.
What should you assess before migrating from VMware?
Before starting any migration, conduct a thorough assessment of your current VMware environment:
- VM inventory — Document every virtual machine: OS, CPU, RAM, storage, network dependencies
- Application mapping — Identify which VMs support which business applications and their interdependencies
- Performance baselines — Record current CPU utilization, memory usage, IOPS, and network throughput for each workload
- Licensing audit — Calculate your current VMware licensing costs including vSphere, vSAN, NSX, and any third-party tools
- Compliance requirements — Note any regulatory requirements (ISO 27001, GDPR, industry-specific) that must be maintained post-migration
This assessment typically takes 1-2 weeks and forms the foundation for your migration plan.
How do you plan a VMware to OpenStack migration?
A successful migration plan addresses five key areas:
1. Infrastructure design
Map your VMware components to OpenStack equivalents:
- ESXi hosts → Nova compute nodes
- vCenter → Horizon dashboard + OpenStack APIs
- vSAN/VMFS → Cinder block storage (at Pro-zeta, powered by BlackStor)
- NSX/vSwitch → Neutron software-defined networking
- vSphere HA → Nova HA + Masakari (automatic VM recovery)
2. Migration strategy
Choose your approach based on workload criticality:
- Lift and shift — Direct VM conversion using migration tools. Best for standard workloads. Fastest approach.
- Re-platform — Migrate VMs with minor OS/driver adjustments. Required for some Windows workloads.
- Phased migration — Move non-critical workloads first, validate, then migrate production. Recommended for large environments.
3. Timeline estimation
Based on Pro-zeta's experience with dozens of migrations:
- Small (under 50 VMs): 4-6 weeks
- Medium (50-200 VMs): 6-8 weeks
- Large (200+ VMs): 8-12 weeks with phased approach
4. Risk mitigation
- Maintain VMware environment in parallel during migration (minimum 2 weeks overlap)
- Create rollback procedures for every migrated workload
- Test application functionality after each batch migration
- Schedule critical workload migrations during maintenance windows
5. Cost projection
Calculate expected savings. Typical Pro-zeta customers see:
- 40-60% TCO reduction compared to VMware/Broadcom pricing
- $0 software license fees — OpenStack is open source
- Predictable monthly costs — no surprise per-core charges
What tools are used for VMware to OpenStack migration?
Several production-ready tools handle the technical migration:
- Coriolis — Open-source VM migration tool supporting VMware to OpenStack. Handles disk conversion, network mapping, and driver injection automatically.
- Virt-V2V — Red Hat's conversion tool. Converts VMware VMDK disks to OpenStack-compatible formats (QCOW2, RAW).
- Hystax Acura — Commercial tool for live migration with minimal downtime. Supports incremental replication.
- MigrateKit — VEXXHOST's open-source tool specifically designed for VMware-to-OpenStack migrations.
Pro-zeta uses a combination of these tools depending on the workload requirements, with Coriolis and Virt-V2V as the primary migration engines.
How does the actual migration process work?
Pro-zeta follows a structured 5-phase process:
Phase 1: Discovery (Week 1-2)
We audit your VMware environment — every VM, storage volume, network configuration, and application dependency. The output is a complete migration inventory with risk classification.
Phase 2: Planning (Week 2-3)
Based on discovery, we create a detailed migration plan: workload prioritization, batch grouping, network mapping, storage allocation, timeline, and rollback procedures.
Phase 3: Infrastructure (Week 3-4)
We deploy your dedicated OpenStack environment on HPE enterprise hardware with BlackStor storage in our Prague datacenter. Network connectivity, VPN tunnels, and monitoring are configured.
Phase 4: Migration (Week 4-8)
Batch migration of VMs according to the plan. Non-critical workloads first, then progressively more critical systems. Each batch includes:
- VM conversion and transfer
- Network reconfiguration
- Storage migration
- Application-level validation
- Performance verification against baselines
Phase 5: Validation (Week 8-10)
Comprehensive testing of all migrated workloads:
- Application functionality testing
- Performance benchmarking against pre-migration baselines
- Security audit and compliance verification
- Monitoring and alerting configuration
- Documentation and knowledge transfer
- 24/7 support activation
What are the common challenges in VMware to OpenStack migration?
Based on 8+ years of experience, these are the most frequent challenges and solutions:
- Network reconfiguration — VMware NSX to Neutron mapping requires careful planning. Solution: detailed network topology documentation during discovery phase.
- Windows VM drivers — Some Windows VMs need VirtIO driver injection. Solution: automated driver injection during Virt-V2V conversion.
- Storage performance differences — Workloads optimized for vSAN may behave differently. Solution: Pro-zeta's BlackStor storage delivers consistent high IOPS, often exceeding vSAN performance.
- Application compatibility — Some vendor applications are "certified for VMware only." Solution: most run identically on KVM/OpenStack. We test each application during validation phase.
- Team training — Operations team needs to learn OpenStack management. Solution: Pro-zeta provides managed operations — your team focuses on applications, we manage the platform.
How much does VMware to OpenStack migration cost?
Migration costs depend on environment size and complexity:
- Assessment and planning: Included in Pro-zeta's migration service
- Infrastructure deployment: Included — we deploy and configure the OpenStack environment
- Migration execution: Included — automated tooling plus expert oversight
- Post-migration support: 24/7 managed support included in Tier5 platform
The primary cost is the ongoing Tier5 managed cloud subscription, which is typically 40-60% less than equivalent VMware licensing costs.
Why choose Pro-zeta for VMware to OpenStack migration?
- 8+ years of production OpenStack experience — We've been doing this since 2016, long before the Broadcom exodus
- BlackStor high-performance storage — Our proprietary storage outperforms Ceph-based alternatives
- Own datacenter in Prague — European data sovereignty, GDPR compliance, low latency
- ISO 27001 + ISO 9001 certified — Enterprise-grade security and quality management
- Dedicated hardware — No noisy neighbors, no multi-tenant resource contention
- 24/7 managed operations — We handle the infrastructure, you focus on your business
Ready to start your migration? Contact Pro-zeta for a free assessment.