Do you agree that building CMS cluster in two Datacenter not provide full resilience. According to CMS clustering guidlines, cluster database should consist of minimum 3 nodes. Lets assume taht we have 2nodes in datacenter 1 and one nodes in datacenter 2. If we have outage in Datacenter1, where we have deployed 2 Database nodes, third one on Datacenter2 will not be able to check whether it's safe to promote itself to master and continue servicing the database requests. So is it means that videoconferencing services wan't be operational at all or no write operation will be possible. From my point of view it makes sense to cluster CMS in minimum 3 datacenters.
