On Sat, Feb 14, 2009 at 2:28 PM, Dor Laor <dlaor@xxxxxxxxxx> wrote: > > Both qcow2 and vmdk have the ability to keep 'external' snapshots. I know but they don't implement one feature I cited: clones, or "writable snapshots", which I would like implemented with support for deduplication. Base images / backing files are too limited because they have to be managed by the enduser and there is no deduplication done between multiple images based on the same backing file. > We might use vmdk format or VHD as a base for the future high performing, > safe image format for qemu Neither vmdk nor vhd satisfy my requirements: not always consistent on disk, no possibility of detecting/correcting errors, susceptible to fragmentation (affects vmdk, not sure about vhd), and possibly others. Jamie: yes in an ideal world, the storage virtualization layer could make use of the host's filesystem or block layer snapshotting/cloning features, but in the real world too few OSes implement these. -marc -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
