Hello. I'm setting up a cluster that has three nodes in our production rack. My intention is to have a replication factor of two for this. For disaster recovery purposes, I need to have another node (or two?) off-site.
The off-site node is entirely for the purpose of having an offsite backup of the data - no clients will connect to it. My question is, is it possible to configure Cassandra so that the offsite node will have a full copy of the data set? That is, somehow guarantee that a replica of all data will be written to it, but without having to resort to an ALL consistency level for writes? Although the offsite node will on a 20Mbit leased line, I'd rather not have the risk that the link goes down and breaks the cluster. I've seen this suggestion here: http://www.datastax.com/docs/0.7/operations/datacenter#disaster but that configuration is vulnerable to the link breaking, and uses four nodes in the offsite location. Regards, Brian
