# Architect Develops Open-Source Alternative to Restricted VMware VDDK Andrija Panić releases a clean-room implementation of VMware's disk library to enable VM migration. - **Source:** [www.theregister.com - Articles](https://brifing.si/source/2c34ea50-d341-4a10-925d-12c012a9ad10) - **Published:** 2026-11-03 - **Topic:** [Software & Engineering](https://brifing.si/c/engineering) - **Original article:** - **On Brifing:** https://brifing.si/s/2e1cb8ee-1c2d-4a75-82b3-47b1976b082b ## VMware Restricts Access In August, VMware restricted access to its Virtual Disk Development Kit, limiting downloads exclusively to official partners. This move hindered developers of storage and backup applications who relied on the tool. Consequently, many migration tools used for moving virtual machines to alternative platforms became significantly harder to install and operate for customers. ## The OpenVDDK Initiative Cloud architect Andrija Panić developed an open-source alternative to address the sudden lack of public access. His project serves as a drop-in replacement for libvixDiskLib.so.8.0.3, the library essential for reading virtual disks. The tool was built from scratch using only public documentation and black-box testing, ensuring it contains no proprietary VMware code. ## Technical Implementation Details Panić wrote the tool in Go, incorporating a thin C layer to expose the exact interface, library name, and symbol versions as the original VMware code. The implementation is strictly read-only, focusing on enabling backup and migration tasks. It does not possess the capability to write to disks, maintaining a specific functional scope. ## Compatibility and Testing The tool has been successfully tested against vSphere versions 6.7 U3, 7.0.3, 8.0.3, and 9.1.1. In laboratory tests accessing vCenter on a standalone ESXi host, every disk read operation matched the expected output. These results suggest a high level of reliability for standard migration and backup workflows currently in use by various organizations. ## Real-World Deployment Reports Independent testers have reported successful integration with platforms including Forklift, OpenShift’s MTV, and Proxmox VE pipelines. A German cloud provider utilized the tool to migrate a large file server, while a US-based company employed it for migrating to Apache CloudStack. These production use cases demonstrate the tool's practical utility in diverse environments. ## Limitations and Disclaimers Panić explicitly stated that these reports do not constitute independently audited customer endorsements or guarantees of suitability for every production environment. As with many free and open-source software tools, users are advised to exercise caution. The project remains an independent effort rather than a formally supported enterprise-grade solution for complex infrastructure. ## Broader Migration Landscape OpenVDDK is not the sole solution for organizations migrating away from VMware. KVM-based OpenNebula offers a tool called OneSwap, claiming a 96 percent success rate. Meanwhile, Nutanix has updated its Move migration tool to function without VDDK, and Red Hat is actively developing its own workarounds to maintain compatibility for its users. ## Strategic Industry Impact By releasing the tool under an Apache license, Panić provides a resource that major vendors like Red Hat may integrate into their own migration stacks. This development highlights the industry's shift toward open-source alternatives when proprietary vendors restrict access to critical infrastructure components, ensuring data portability remains possible for enterprise virtualization users. ## Sources covering this story - https://www.theregister.com/virtualization/2026/11/03/architect-creates-open-source-replacement-for-vm-migration-tool-vmware-has-hidden/5307124 — --- _Summary written by Brifing from the original reporting. Copyright in the original article belongs to its publisher; read the full piece at the link above._