Il 31/05/2012 13:08, Geert Jansen ha scritto: > 1) Target flushes are not guaranteed to happen at all. If the latency of > the target is higher than the maximum interval between writes to the > source, the bitmap will always be dirty when a write to the target > returns, and a target flush will never be issued.
That's a very good point. > 2) The fact that drive-mirror waits for acknowledgments of writes to the > target means that there is at most one I/O outstanding and throughput is > bound by latency. That can be fixed, I'll add it on my ever-growing todo list. :) Paolo
