[DRBD-user] 200+ Resources Created, and Now I See My Mistake

[Eric Robinson]

We have created 200+ resources on our new a 5-node Linstor cluster. The database servers each have 4 NICs in 2 bonded sets. There's a bond on the "front" (client-facing) side of the server and a bond on the "back" (replication network) side of the server. When I built the cluster, I didn't know about NIC management. I wanted the servers to use their "back" bonds for DRBD traffic, so I created separate DNS names for the back bonds. For example, if a server is named "server-a," then the DNS name "server-a" resolves to the IP address of the front bond, and "server-a-repl" resolves to the IP address of the back bond.

When I created the cluster, I used node names server-a-repl, server-b-repl, server-c-repl, server-d-repl, because I thought that was the way to make sure DRBD used the back bonds. That was dumb. I should have left the node names alone and just created additional NICs and Linstor could have used PrefNic to assign the proper replication links.

So here's the question. Is there an easy, non-disruptive way to re-name cluster nodes and re-assign replication links without rebuilding almost everything from scratch?

-Eric





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