В Птн, 08/02/2013 в 09:47 -0500, John Madden пишет: > > As far as I can see there is no difference in configuration. The only > > distinction I can see is the "use case", as N-Way supposed to accept > > writes on all Masters, but Mirror only on one at a time. > > There are configuration differences (see the Admin Guide for the needed > snippets; N-Way requires MirrorMode and then some) but yes, MirrorMode > requires writes to go to only one node at a time.
I've re-red those sections of docs two more times, still don't see the difference > > This is not clearly stated anywhere, so do they really differ only in > > proxy/balancer in front of Mirrors? > > Well I'd say that's a pretty big difference, wouldn't you? :) Sure, this is a big difference if you look at it as on Deployment/Usage case scenarios. And, as the proxy/balancer for Mirror mode could be setup separately, I would think of Mirror mode as of identical configuration to N-Way Multi-Master, plus a separate/combined proxy/balancer. It would be very helpful if somebody can confirm that Mirror mode and N-Way Multi-Master setups are identical in *configuration* not counting proxy/ballancer. I would be thankful for pointers on the difference in setups if that if not true. > > If so, why can't I do 3 Mirrors with proxy/balancer in front? > > You can have multiple replicas, you just have to ensure writes only go > to the current master. So, Mirror mode can be setup across more than 2 Servers?
