Am 27.04.2011 15:27, schrieb Stefan Hajnoczi: > From: Anthony Liguori <aligu...@us.ibm.com> > > For leaf images with copy on read semantics, the stream commands allow the > user > to populate local blocks by manually streaming them from the backing image. > Once all blocks have been streamed, the dependency on the original backing > image can be removed. Therefore, stream commands can be used to implement > post-copy live block migration and rapid deployment. > > The stream command can be used to stream a single sector, to start streaming > the entire device, and to cancel an active stream. It is easiest to allow the > stream command to manage streaming for the entire device but a managent tool > could use single sector mode to throttle the I/O rate. When a single sector > is > streamed, the command returns an offset that can be used for a subsequent > call.
You mean literally single sectors? You're not interested in completing the job in finite time, are you? ;-) I would suggest adding a length argument for the all=false case, so that management tools can choose more reasonable sizes. Kevin
