2011/8/1 Sage Weil <sage@xxxxxxxxxxxx>: > On Mon, 1 Aug 2011, Gregory Farnum wrote: >> On Mon, Aug 1, 2011 at 8:23 AM, Yehuda Sadeh Weinraub >> <yehuda.sadeh@xxxxxxxxxxxxx> wrote: >> > The osd first sends the ack when it receives the request >> >> Actually it sends an ack when the request is applied in-memory to all >> the up OSDs in the PG. :) > > That was the original intent, at least. More precisely.. > > * ACK means the request is in the page/buffer cache on all replicas > * COMMIT means the request is on stable storage on all replicas > * COMMIT implies ACK. Could we make this an option in librbd? A performance mode with a callback on ACK and a secure mode with callback on COMMIT. Considered that I have two independent datacenters, the performance mode should be "quite safe". I will try this in a few days... Thanks, Christian -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
