[libvirt] Checkpoint VMs

Hi! Some months ago there were some mails about ideas of adding new API functions for checkpointing of domains. For the project group Virtualized SuperComputer (the crazy guys with the ESX driver) we would like to have such a feature and would be willing to propose API patches and anything the like. As we have to deal with many VMs at the same time which belong to one computation job (think: virtualized HPC cluster) we are facing the problem to checkpoint a set of VMs at the same time. So besides a usual checkpoint we would be interested in something like checkpointAt (host, vm, timestamp) restoreFromCheckpointAt (host, vm, timestamp) an let the hypervisor / libvirtd / whatever piece of software on the host face the problem to execute the checkpoint/restore command at <timestamp>. The main idea behind this is to checkpoint or restore the set of VMs as simultaniously as possible. As far as I got it ESX for examples is able to execute tasks at a given point of time once or recurring as far as you have a Virtual Center with all your hosts belong^Wconnected to it. Any opinions on such new functions? I guess more people could be interested in this functionality. Comments welcome. Ciao Max -- Follow the white penguin.