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...es/Snapshots2 * In the last para, there is a mention of copy the blocks from the disk using dirty-bitmap as reference. How to accomplish this ? block-mirror with bitmap or is there a qemu-img command ? some details would be appreciated. // backup software now reads foo.img using t0_dirty.dbmp to perform incremental backup, when finished * The backup after few runs in the backup store would be base image + bunch of delta blocks ? Will this be same as base disk and bunch of deltas ? or there is some special way to merge these ? * I am assuming this scheme (snapshot, bitm...

...ommand ? some details > would be appreciated. block-backup is a new QMP command that libvirt would need to expose; I don't know whether it is better to overload the existing virDomainBlockCopy() API for it, or to add a new API. > > // backup software now reads foo.img using t0_dirty.dbmp to perform > incremental backup, when finished > > > > * The backup after few runs in the backup store would be base image > + bunch of delta blocks ? Will this be same as base disk and bunch of > deltas ? or there is some special way to merge these ? > > *...

...overload the existing > virDomainBlockCopy() API for it, or to add a new API. So this seems to be already in qemu. How can I try this with KVM context. Do I need to build from source ? or some version of KVM already has this ? > >> // backup software now reads foo.img using t0_dirty.dbmp to perform >> incremental backup, when finished >> >> >> >> * The backup after few runs in the backup store would be base image >> + bunch of delta blocks ? Will this be same as base disk and bunch of >> deltas ? or there is some special way to merge...