Disadvantages of CCR in Exchange 2007
Posted on 2008-11-02
At the moment, our Exchange servers (2) are arranged in a 2+1 clustered formation, i.e. active-active-passive.
We are evalutating the different types of DR/HA in Exchange 2007, and are thinking of moving to CCR.
However, I have heard of two drawbacks;
a) CCR only supports two nodes
b) With CCR, the logs are only replicated across from the active to passive once they have been commited.
So, I can see two issues;
a) If we have two Exchange servers, how can we get this onto a two node cluster? Or do we build two clusters, i.e. one active-passive and another active-passive. So really, this is two two-node clusters, as opposed to a four node one?
b) If the active server was to be lost due to corruption and we had to move to the passive, any uncommited transacations would be lost?
Hope someone can clarify