Disk images

VMDK → qcow2

Need the other direction? qcow2 → VMDK →

Convert your VMware virtual disk files (VMDK) to QCOW2 format to seamlessly migrate virtual machines from VMware environments to KVM/QEMU-based hypervisors. This conversion is essential for users transitioning to open-source virtualization platforms.

VMDK is the proprietary virtual disk format used by VMware products, supporting various disk types like monolithic or split, sparse or preallocated. QCOW2, on the other hand, is the native copy-on-write disk format for QEMU/KVM, known for its flexibility, thin provisioning, snapshot capabilities, and optional compression/encryption. The conversion process involves reading the raw disk data from the VMDK file and restructuring it into the QCOW2 format, ensuring data integrity while adapting to the target hypervisor's native disk standard. This allows the virtual machine to be launched and operated efficiently within a KVM/QEMU environment.

This conversion primarily focuses on data integrity and format compatibility. There is no qualitative loss of data, as the process is a direct block-level transfer, ensuring the virtual disk's contents remain identical after conversion.

Tips

Ensure the source VMDK is not in use by a running virtual machine to prevent data corruption during conversion.
Verify sufficient disk space on the target system for the QCOW2 file, especially if converting from a thin-provisioned VMDK.
After conversion, boot the VM in QEMU/KVM and install any necessary VirtIO drivers for optimal performance.
Consider converting only the active data if the VMDK contains multiple snapshots, or flatten it first for a simpler conversion.

Common use cases

Migrating virtual servers from a VMware vSphere infrastructure to a KVM-based cloud environment to reduce licensing costs.
Moving a development or testing VM from VMware Workstation to a local KVM setup for integration with other open-source tools.
Consolidating mixed virtualization environments by standardizing on QEMU/KVM for all virtual disk images.
Preparing virtual appliances created in VMware for deployment on open-source virtualization platforms.

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File formats: what to choose

A quick guide to strengths and trade-offs of popular formats — so you pick the right one before converting.

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Disk images

Virtual disks and raw drive images.

Common extensions: ISO, IMG, VHD, VMDK, QCOW2

Advantages

+ ISO is standard for installers and OS images
+ VM formats bundle entire systems
+ Preserves exact byte-level copies

Disadvantages

− Images are often several gigabytes
− Conversion between VM formats can be slow
− Boot sectors may break if format changes

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Images

Raster and vector graphics for web, print, and photography.

Common extensions: PNG, JPG, WebP, AVIF, GIF, SVG, HEIC, TIFF

Advantages

+ WebP and AVIF offer excellent compression for the web
+ PNG keeps transparency and sharp edges
+ SVG scales without quality loss

Disadvantages

− RAW and TIFF files are large and slow to share
− JPEG loses quality on every re-save
− Some formats are not supported in older browsers

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Documents

Office files, PDFs, ebooks, and plain text.

Common extensions: PDF, DOCX, XLSX, PPTX, ODT, EPUB, TXT

Advantages

+ PDF locks layout for printing and sharing
+ DOCX and ODT are easy to edit collaboratively
+ Plain text works on any device

Disadvantages

− PDF is hard to edit without special tools
− Complex layouts may shift after conversion
− Scanned PDFs need OCR for editable text

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Video

Clips, streams, screen recordings, and movies.

Common extensions: MP4, WebM, MOV, MKV, AVI, MPEG

Advantages

+ MP4 (H.264/H.265) plays almost everywhere
+ WebM is efficient for web embedding
+ MKV can hold multiple audio and subtitle tracks

Disadvantages

− High-resolution video needs lots of storage and bandwidth
− Re-encoding always takes time and may reduce quality
− Some codecs require licensing for commercial use

Frequently asked questions

No, it is highly recommended to shut down the virtual machine using the VMDK before conversion to ensure data consistency and prevent corruption.

While QCOW2 preserves the core disk data and thin provisioning, specific VMware-only features like linked clones or certain snapshot chains might need to be flattened or handled differently before conversion.

Yes, the operating system and its data remain intact. You might need to install KVM-specific drivers (e.g., VirtIO) within the guest OS for optimal performance and device recognition.

After conversion and proper driver installation, a VM running on QCOW2 under KVM can offer comparable or even superior performance to its VMDK counterpart on VMware, depending on hypervisor configuration and hardware.

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