Greetings! We have a few Corosync+PaceMaker+DRBD clusters and a couple older Heartbeat+DRBD clusters. Our infrastructure is currently located in a single facility. We have the opportunity to establish a DR site in another data center over a high bandwidth connection (2-4Gbps). I am thinking of moving the standby cluster nodes to the secondary data center. One thing that concerns me is the greater possibility of split-brain scenarios. Currently our clusters communicate heartbeat through multiple paths: 1. The primary LAN link that users communicate through; 2. The DRBD link; 3. A dedicated cluster communication LAN. If we move the standby cluster nodes to the secondary facility, there will no longer be redundancy on the heartbeat links. Everything will go through the inter-data-center connection. This concept is a little worrisome. Should I be very concerned? Is there a way to minimize the risk of split-brain over WAN?
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