From the source
Cognition open-sourced Blockdiff, a file format for instant block-level diffs of VM disks, built for their VM hypervisor Otterlink.
It enables fast snapshot creation (a couple of seconds) compared to EC2's 30+ minutes.
Blockdiff: How we built our own file format for VM disk snapshots
From the source
We built our own file format blockdiff for instant block-level diffs of VM disks. ... we’re open-sourcing our implementation today.
cognition.com
