Hello, The website said user questions are welcome and for one-off questions I could just mail, so here goes:
Background: NetApp Snashot functionality gives you application consistent snapshots of data. Just inform the app a snapshot is about to be made, depending on the app, it needs to go in to some sort of backup mode, of just stop and flush outstanding I/O. Next, a snapshot is made and everything just runs on. Because of the underlying WAFL filesystem design, the snapshot always points to the blocks at the time of the creation without needing to do any COW. Layered on top op this functionality is SnapMirror, where the delta between this snapshot and a previous snapshot (both being static in nature), is asynchronously replicated to a second system. There, this delta is applied to a copy of the disk as a local snapshot. This setup gives you application consistent data disks on a remote location as a form of disaster tolerancy. The RPO is the snapshot/snapmirror frequency. KVM: My question is rather simple. Could something like this be implemented with kvm-img and rsync and/or lvm? I've played with the backing_file option, but this means I have to shutdown the vm a boot is on the new file to let this work. Greetz, Fred -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
