Hi, thanks for your reply. Now, I have another question. Given all the writes are replicated in order, why is flush event replicated? As far as I know, what a flush does is just making previous writes committed and doesn't do any modification to the data, which makes it seem to me that replicating it or not doesn't make any difference. Sent from my Mi phone On Jason Dillaman <jdillama@xxxxxxxxxx>, Jun 6, 2017 19:20 wrote: On Tue, Jun 6, 2017 at 4:07 AM, xxhdx1985126 <xxhdx1985126@xxxxxxx> wrote: > So, if that case happens, rbd-mirror will go on replicate subsequent writes, is this right? Yes -- until it reaches a flush event and is stalled on the uncommitted IO from the down OSD (or until it reaches the hard-stop of 100 in-flight, uncommitted IOs). -- Jason ��.n��������+%������w��{.n����z��u���ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f