Il 13/05/2013 19:50, Wolfgang Richter ha scritto: > Paolo/anyone who knows - > > Are drive-mirror sync points (NBD flush commands) reflecting guest write > barriers? Are guest write barriers respected by drive-mirror? If so, > that would make drive-mirror much more palatable for disk introspection > work (a drop-in usable feature of QEMU!).
Kind of. Sync points reflect points where the destination image is a copy of the source image at some point in time. Destination image write barriers hence reflect places where the destination image is consistent with guest write barriers, but not all guest write barriers become destination image write barriers. Paolo
