Windows Longhorn does work with the format when running in QEMU
, though it requires specific settings due to its age and experimental nature. Savannah - NonGNU How to Make It Work
To successfully run Longhorn in a qcow2 environment, follow these steps: Create the Image to create a blank qcow2 file for your installation. qemu-img create -f qcow2 longhorn.qcow2 Use code with caution. Copied to clipboard Emulate Older Hardware
: Longhorn builds (like 4074) generally expect IDE/PATA interfaces rather than modern VirtIO or SATA. Ensure your VM configuration uses:
: VESA or Cirrus (Longhorn's early "Plex" or "Slate" themes often struggle with standard VGA drivers)
: PS/2 (USB tablets or modern mouse drivers often fail during the first stage of installation) Expect a "Hardware Detection" Hang
: During installation, the OS may appear to freeze for up to an hour while detecting hardware. It is usually still processing in the background; do not force a restart during this phase. Savannah - NonGNU Important Note on "Longhorn" If you are referring to the Longhorn block storage system for Kubernetes rather than the Windows OS: Longhorn storage natively supports qcow2 as a backing image format.
When used as a backing image, Longhorn can deliver the file across nodes for high availability. If using the V2 Data Engine
, Longhorn will automatically convert the qcow2 image to a raw format for compatibility. QEMU start command optimized for a particular Longhorn build number? longhorn/backing-image-manager - GitHub
To get Windows Longhorn (the unreleased pre-Vista OS) working as a QCOW2 image in a virtual environment like QEMU or KVM, you need to handle specific BIOS/clock settings and hardware emulation. 1. Quick Command Setup windows longhorn qcow2 work
For a smooth installation, use the following QEMU command. Note that the Cirrus VGA and a fixed RTC clock are crucial for preventing "expired" build errors and display issues:
# Create the 20GB QCOW2 image qemu-img create -f qcow2 lh.img 20G # Run the installation qemu-system-i386 -hda lh.img -cdrom longhorn_iso_name.iso -boot d -m 1G -usbdevice tablet -vga cirrus -rtc base="2003-01-01",clock=vm Use code with caution. Copied to clipboard 2. Essential Configuration Steps
Virtual Disk (QCOW2): While Longhorn can run on 10GB, 20GB is recommended for stability and software installation.
Video Driver: Use -vga cirrus. Many Longhorn builds have compatibility issues with newer generic QEMU display drivers.
System Clock (RTC): This is the most common "gotcha." Many Longhorn builds have a time-bomb; setting the -rtc base to the year the build was compiled (e.g., 2003 or 2004) prevents the OS from refusing to boot.
Accelerator: If your host supports it, add -accel kvm (Linux) or -accel whpx (Windows) to significantly increase performance. 3. Where to Find Build Files
If you need specific ISOs to convert or install, the Internet Archive hosts a comprehensive Windows Longhorn Build Archive with versions ranging from early pre-reset (3683) to post-reset (5212). 4. Using QCOW2 with "Longhorn" Storage (Kubernetes)
If your query refers to the Longhorn distributed storage system for Kubernetes rather than the OS:
Backing Images: Longhorn (the storage engine) supports using QCOW2 files as backing images. Windows Longhorn does work with the format when
Usage: You can upload a QCOW2 image through the Longhorn UI or via kubectl to serve as the base for new volumes.
Windows Longhorn (the development codename for Windows Vista) working with a disk image, you generally need to use or a similar hypervisor. Quick Setup Steps Create the Image utility to create a 20 GB qcow2 file: qemu-img create -f qcow2 longhorn.qcow2 Use code with caution. Copied to clipboard Handle the "Timebomb"
: Most Longhorn builds have an expiration date. You must set the VM's real-time clock (RTC) to a date appropriate for your build (e.g., September 23, 2002 for build 3683): Example flag: -rtc base="2002-09-23",clock=vm Required VM Settings -vga cirrus . Removing this often breaks the setup graphics. Architecture qemu-system-i386 for 32-bit builds. : Allocate at least of RAM for stability. Important Compatibility Notes VirtualBox Alternative : If you prefer a GUI, many users install Longhorn in VirtualBox by selecting "Windows XP 32-bit" as the version. Driver Support
: Sound drivers are often unavailable, and guest additions can have major compatibility issues. Storage Drivers
: While modern Windows images use VirtIO for speed, older builds like Longhorn may require standard settings initially. Which specific build of Longhorn are you trying to run? Windows Longhorn Build 4081 - Installation in Virtualbox 5 Nov 2022 —
Evaluating Windows Longhorn in a modern virtualization environment using the QCOW2 (QEMU Copy-On-Write) format is a popular way to explore the "lost" successor to Windows XP. Longhorn, the codename for what eventually became Windows Vista, is famous for its ambitious features like WinFS and the Aero Glass interface that were largely scaled back or reset during development. Virtualization & Performance with QCOW2
Running Longhorn in QEMU/KVM using a QCOW2 image is the standard for enthusiasts.
Storage Efficiency: QCOW2 supports sparse files, meaning the image only takes up space as data is written, which is ideal for testing multiple builds without wasting disk space.
Snapshots: The format's ability to create snapshots is critical for Longhorn. Many builds (like 4093) are notoriously unstable and can "break" if you install the wrong driver or update. Part 9: The Verdict – Is Qcow2 the Ultimate Longhorn Host
Performance Trade-offs: While QCOW2 is flexible, using compressed images in a Longhorn storage cluster (the cloud storage software, not the OS) can lead to significant performance drops due to decompression overhead. Build Compatibility & Stability
Not all Longhorn builds are equal. When setting up your QCOW2 environment, the build choice determines your experience:
Build 4074: Often cited as the most "complete" pre-reset build, featuring early Aero effects and a functional sidebar.
Build 4093: Warned against by many; it is extremely slow, prone to hanging, and often requires modified installers just to boot in a virtual machine.
Post-Reset Builds (5000 series): These are more stable but lose the unique "Longhorn" charm as they transition closer to the final Windows Vista code base. Key Features to Explore
If you successfully mount a Longhorn image (recommended size of 20GB or more), look for these experimental features: Can you ACTUALLY use Windows Longhorn in 2024?
Yes, but with caveats.
For preservation, malware analysis, or UI archaeology, the qcow2 + KVM combo is unbeatable. For "daily driving" Longhorn (why would you?), stick to raw on real hardware.
qemu-img create -f qcow2 longhorn.qcow2 40G.If your Longhorn qcow2 image won't boot, refer to this triage table:
| Error Screen | QEMU Fix | Qcow2 Fix |
| :--- | :--- | :--- |
| 0x7B (inaccessible boot device) | Add if=ide to drive param | Recreate qcow2; do not use virtio-blk |
| 0x50 (page fault) during boot | Reduce RAM to 1024MB (-m 1024) | Snapshot restore; corrupt paging file |
| Stuck at "Please Wait" (blue bar) | Add -no-hpet -no-acpi | Delete qcow2 and recreate; bad cluster align |
| Sidebar renders black | Add -cpu ... -hypervisor flag | Already fixed; rebuild snapshot |
To embark on this adventure, you'll need:
qemu-img for managing QCOW2 images.