Re: [libvirt-users] Spawn new domains from a snapshot.

On 25/05/12 18:17, Eric Blake wrote: Is there any link where I can follow the discussion about this topic? Disk snapshot, the full resume would be a cool feature as well but I think that the time spent to realize it may be too much atm compared to the business cases that could benefit from it. As I said disk state. The case is what I wrote before: "Lots of cpu cycles saved once new image versions must be deployed (typical case a windows update to propagate in the nodes network)." Imagine how painful is to maintain in a cloud system OS and software updates. Indeed is read only, to be clear: I don't need anything magical atm, just a "domain lifecycle branching" from disk images. Glossary is quite confusing but for what I understood #2 snapshot disk image should be the "backing file", here comes the problem: as I'm using copy on write snapshot #2 image is not the real backing file, without cow would be really easy. What my system is capable to do atm is: with or without cow, take a snapshot and automatically convert it into a qcow2 disk image through qemu-img snapshot conversion; the resulting disk is used for analysis purposes but would be nice to use it also for this kind of scenario. Everything is already possible if I don't use cow, but you can easily guess in this case how performance suffers.