photoncloud-monorepo/coronafs/README.md

CoronaFS

CoronaFS is UltraCloud's mutable VM-volume layer.

Current implementation:

• custom block backend, not NFS
• control API on coronafs-server
• raw volume data stored under /var/lib/coronafs/volumes
• exported to workers as nbd:// targets via qemu-nbd
• primary consumer: plasmavmc managed VM volumes

Intentional split:

• mutable VM volumes live on CoronaFS
• immutable VM images live in LightningStor object storage

This keeps VM root/data disks on a shared block path while leaving image distribution on the object layer.