It’s Alive! Image Live Migration, Live Import and Instant Restore with Ceph RBD
summary
Image live migration moves a volume so the target immediately handles writes while reads fetch missing blocks from the source, using libvirt RBD only and a background copy that finishes later. External import uses a NBD source (chemo-nbd) to preserve sparseness and avoid zero transfer. Backup POC writes diffs as qcow2 chain to S3 and restores by exposing them over NBD, allowing 452 MB migrated in the demo and yielding a 156 MB final footprint; initial restores incur object-store read latency until background migration completes.
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