Kimmo Koivisto wrote:

Hello

I have five servers with FDS 1.0.4 and I would like to use multimaster replication in those servers.

I know that there is some kind of limit for the number of servers in MMR, four servers is the maximun if I remember correctly.

So, can I add replication agreements to five servers, is there a hardcoded limit for four servers or what? What happends if I add those agreements?

There is no hard coded limit. 4 is the number of masters we have tested extensively with. The MMR protocol supports a theoretical limit of 65000+ masters, but we've never actually tested with that many :-) The practical limit is the number of threads, since each replication agreement is a separate thread within the server process. So at some point you will see performance degradation, depending on what type of processors you have, how many you have, the amount of RAM, the size of your databases, and the transaction rate.

That being said, 5 masters should work. Please let us know, if you try it, what your experience is, and some information about your replication topology.

Regards, Kimmo Koivisto

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