We have two 3 node clusters in separate data centers, let's call them
ClusterP is our primary and
ClusterS is our secondary for disaster recovery. Each cluster has multiple failover cluster instances on it but they are completely segregated from each other.
We'd like to introduce AlwaysOn Availability Groups from
ClusterS. I've read multiple guides to this and there is one question I can't really answer. We do NOT have the ability to have cross-datacenter shared storage (no SAN mirroring across datacenters). With this setup, is it possible to setup AlwaysOn Availability Groups?
I understand if we had a standalone server in the secondary datacenter, we could setup an AG with an FCI by adding that server as a node in WFCS, removing it as an owner from any of the FCIs on
ClusterP, and setting it up as an AG member. This method does not use shared storage based on my research.
My confusion comes from having two-three node clusters and how they can work together with AGs. It seems to me I need to disband the cluster on
ClusterS, add the nodes to
ClusterP, add the FCIs needed then setup the nodes so that the physical nodes in location of
ClusterS can only host those FCIs and the nodes in location of
ClusterP can only host those FCIs. Will this work?
I'd appreciate any tips.