> And if it issues a smaller request, there is no way for a guest device > to tell it “OK, here’s your data, but note we have a whole 4 MB chunk > around it, maybe you’d like to take that as well...?” > > I understand wanting to increase the backup buffer size, but I don’t > quite understand why we’d want it to increase to the source cluster size > when the guest also has no idea what the source cluster size is.
Because it is more efficent.
