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.
The datacenter kept humming, carrying the story of one VM saved by a single, exportable file.
The progress bar appeared. 1%... 3%...
“We need to get it out of here,” Elara said. “The new Proxmox cluster is ready. We just need a bridge.” xcp-ng ovf
Then, a low-level tool: qemu-img convert -f raw /tmp/zephyr_fix.raw -O vmdk -o subformat=streamOptimized /export/fixed.vmdk .
Then, the heavy lifting. It started with the main disk: zephyr-system.vmdk . The hypervisor translated the internal VHD format on the fly, streaming blocks of data into a stream-optimized VMDK. Elara watched the verbose log scroll by.
“Told you,” Leo whispered.
“Zephyr is sick,” said Leo, her junior admin, pointing at the metrics. “Look at the I/O wait. It’s thrashing.”
A dialogue box appeared. Select destination . She pointed it to an NFS share on the new cluster. Format: OVF (Folder) .
She manually crafted a new .ovf descriptor, stitching in the new checksums. It was surgery without anesthesia. Behind the scenes, the XCP-ng host went to work
Elara pulled the log. Error: Invalid backlink – orphaned snapshot block at LBA 8847360 .
“Then we fix it,” Elara said, hitting Export .
The new cluster read the OVF. It saw the hardware profile. It saw the disk. It said: Import successful. Ready to start. It wrote these into a