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C vdo Projects
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Project mention: Blockdiff: We built our own file format for VM disk snapshots | news.ycombinator.com | 2025-10-01
I wonder didn't they used VDO thin provisioning with LVM2.
Also, a few years ago I've implemented VM management tool called 'vmess', in which the concept is to maintain a tree of QCOW2 files, which R/W snapshots are at the leafs and R/O snapshots are the nodes of the tree. The connection up to the root is made via QCOW2 backing-file store mechanism, so a newly created leaf starts a 0 space. I did this because libvirt+qemu impose various annoying limitations surrounding snapshots-with-in-qcow2, and I liked the idea of file-per-snapshot.
VDO: https://github.com/dm-vdo/kvdo
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C vdo discussion
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