The developers mounted the snapshot, applied the patch, and... it broke the database schema. The test failed. However, in the process, they had also generated some valid configuration files inside that snapshot that they wanted to keep, while discarding the broken database changes.
Would you like a working shell/PoC script implementing a basic version of lvmerge , or a man page draft for it? lvmerge
She corrected herself. The true power move—and the lesson for the day—was understanding that lvmerge (often implemented via lvconvert --merge ) is the mechanism used to fold a snapshot's changes back into the main volume, making the data consistent without downtime. The developers mounted the snapshot, applied the patch, and