The Broadcom acquisition reshaped the virtualization market and pushed a wave of customers toward open-source alternatives. This is my working analysis of moving off VMware — what changed commercially, how Proxmox/KVM actually performs on storage and GPU workloads, the security trade-offs, and a migration path that holds up.
Broadcom closed its $69 billion VMware acquisition in November 2023, and the commercial impact has been more disruptive than most expected. Three changes did the most to push customers toward the exits.
Organizations have reported price increases of 300–1,250% when mapping existing VMware usage onto the new bundles. That has driven high-profile migrations — Toshiba (after 16 years on VMware) and MSIG Insurance Asia (1,500–2,000 VMs) among them.
For a typical mid-sized deployment (5 dual-socket servers, 16 cores per CPU), the gap is stark.
| Line | VMware under Broadcom | Proxmox/KVM |
|---|---|---|
| Licensing floor | 72 cores per product line | No core minimums, no mandatory bundles |
| Annual cost | $30k–70k+ | ~$650 (Basic) – ~$2,000 (Premium) |
| 5-year TCO | $150k–350k+ | $3,250–10,000 |
| Commitment | 3-year | None required |
For many organizations, savings of 90%+ make migration financially compelling even after transition costs and feature gaps.
In published benchmarking, Proxmox/KVM showed a consistent NVMe-TCP advantage over ESXi: higher IOPS in 56 of 57 tests (~50% higher), over 30% lower latency, and ~38% more bandwidth at peak (12.8 GB/s vs 9.3 GB/s). The difference is architectural — Proxmox uses virtio-scsi over native Linux block devices with a direct I/O path, while ESXi's layered path (VMFS plus a centralized scheduler) becomes a bottleneck under concurrency.
The March 2025 ESXi zero-days illustrate the trade-off. Chained together, they enable full VM escape from an admin-privileged guest.
| CVE | Severity | Issue |
|---|---|---|
| CVE-2025-22224 | Critical (9.3) | TOCTOU in VMCI → code execution |
| CVE-2025-22225 | High (8.2) | Arbitrary write → kernel writes |
| CVE-2025-22226 | Medium (7.1) | Information disclosure in HGFS |
Roughly 409,000 potentially vulnerable targets were identified, concentrated in China, France, and the United States. Architecturally, ESXi is proprietary and large (~60M LOC) with a tightly integrated hypervisor and the VMX process as the primary attack surface. KVM is part of the Linux kernel with a far smaller, modular footprint and the benefit of the broader Linux security ecosystem — fewer lines of trusted code, more eyes on them.
Open-source isn't automatically more secure — it shifts responsibility onto you to patch and harden. The argument here is footprint and transparency, not a guarantee. A migration that swaps a vendor's patch cadence for an unowned one trades one risk for another.
The decision turns on your constraints, not a slogan. Proxmox/KVM is a capable platform for workloads like vLLM/BERT-Large, Whisper, and Prometheus-monitored services when configured properly, and the cost math is hard to ignore. It earns its place where you control your own patching cadence and can absorb a feature gap or two; VMware's vGPU maturity and tooling depth still matter for some estates. This write-up reflects my own testing in the Lazarus Labs homelab — planning the cutover, validating GPU-aware workloads on Proxmox/KVM, and documenting what held up under real constraints.
