Am 10.06.2012 18:10, schrieb Paolo Bonzini: > Il 08/06/2012 19:57, Kevin Wolf ha scritto: >>>> >>>> I agree, doing it like mirroring for new writes on the top layer makes >>>> sense, as long as you are willing to violate the (optional) speed >>>> parameter. I wouldn't think violating the speed parameter in that case >>>> would be an issue, as long as it is a documented affect of performing a >>>> live commit on the active (top) layer. >> The question is what the speed parameter really means for a live commit >> block job (or for an active mirror). I think it would make sense to >> limit only the speed of I/O that doesn't come from the guest but is from >> the background copying. > > Not necessarily, you can throttle the copying speed. If the I/O from > the guest has bursts, you will pick up the work later when the rate > calms down.
Then it's not an active mirror any more, but a passive one. Kevin
