Xcp-ng Ovf 📥

Behind her, the old XCP-ng host spun down the dying drive. Zephyr’s ghost was gone, but its perfect clone—wrapped in a standard, open format—hummed happily in its new home.

She right-clicked the comatose Zephyr. Export → Open Virtualization Format (OVF) .

Behind the scenes, the XCP-ng host went to work. It was a digital archivist, a cartographer of virtual worlds. First, it queried the metadata: Zephyr’s BIOS UUID, its 4 vCPUs, the 8GB of RAM. It wrote these into a .ovf file—an XML manifest that described the soul of the machine.

Elara pulled the log. Error: Invalid backlink – orphaned snapshot block at LBA 8847360 . xcp-ng ovf

[Info] Exporting VDI 9a3f-22b1... (system) [Info] Caching block map... [Warning] Encountered sparse block. Skipping zeroed sectors. [Info] Writing descriptor file... At 47%, it froze.

The new cluster read the OVF. It saw the hardware profile. It saw the disk. It said: Import successful. Ready to start.

“We need to get it out of here,” Elara said. “The new Proxmox cluster is ready. We just need a bridge.” Behind her, the old XCP-ng host spun down the dying drive

Finally, she told XCP-ng to skip the broken disk and just export the configuration. She dragged the manually-fixed VMDK into the folder, zipped the whole thing into a tidy .ova (the single-file archive variant), and dropped it onto the Proxmox import task.

Zephyr was a legacy CentOS 7 VM, a cranky old system that ran the building’s access logs. It had been migrated three times over eight years, accumulating digital scar tissue with each move. Now, the physical drive on its host was clicking like a deathwatch beetle.

“Then we fix it,” Elara said, hitting Export . Export → Open Virtualization Format (OVF)

Then, a low-level tool: qemu-img convert -f raw /tmp/zephyr_fix.raw -O vmdk -o subformat=streamOptimized /export/fixed.vmdk .

Leo exhaled. “You broke the rules. You exported an OVF from XCP-ng, fixed it by hand, and imported it somewhere else. That’s not supposed to work.”