Organizations often switch virtualization vendors due to licensing changes (e.g., VMware’s shift to per-core licensing) or feature sets. A VMConverter allows a systematic escape from vendor lock-in. For example, converting a fleet of 500 ESXi VMs to KVM on Proxmox can save millions in annual licensing fees. The converter is the strategic lever for negotiation.
The source VM is powered off. The converter directly reads the source disk files (e.g., .vmdk ), interprets their block-level metadata, and writes a new disk image in the target format. Tools like qemu-img convert excel here. This method is simple, fast, and safe because the disk is quiesced. However, it requires downtime. vmconverter
The first wave of cloud migration relied on “lift and shift”—taking on-premise VMs and converting them to cloud-native instances. AWS VM Import/Export, Azure Site Recovery, and Google Cloud Migrate all embed VMConverter logic. They convert VMDK/VHD to AMI or managed disk formats, reconfiguring the bootloader for cloud-init and replacing the kernel for cloud-optimized drivers. Without these converters, the hybrid cloud would be a patchwork of incompatible silos. The converter is the strategic lever for negotiation
We are seeing the emergence of —where a management layer (e.g., Red Hat Virtualization, OpenStack) treats all VM formats as ephemeral. The user requests a VM; the orchestrator pulls the source from any format (VMDK, VHDX, raw) and converts it on-the-fly during streaming boot. This eliminates the distinction between “conversion” and “execution.” Tools like qemu-img convert excel here