what Disaster Recovery Solution to use?
My company is planning to implement a DR solution for the our production enviornment. The production enviorments that we have are all 2 node fail-over VCS clusters (SFHA 6.0.1). The DR systems consist of a single node. The products used for this DR solution is VVR for data replication and Geo-cluster for the failover. There is layer 2 stretch network between the 2 sites (prod & DR). We are discussing on 3 solutions,
1. Using VVR for data mirroring and creating single node cluster on the DR site and then creating a geo cluster between the prod and the DR sites. Since the network is stretched,we are planning to have the DR ystems on the same VLAN/subnet as the prod systems. The application VIP will also be the same on both the sites as the service group is up only on one site at a time.
2. Using VVR for data mirroring and adding the node in the DR as the third node in the cluster.
3. Having a Pure Stretched Clusters.
Which solution mentioned above will be the best suited for this purpose? Can you tell me about the pors and cons of each option.