For IVS license in a SA cluster, do we need 1 or 2 IVS license in a cluster?
We need two licenses.
it depends on what licensing scheme are you using
1. if you are using a scheme where one node has all the feature and IVS license and other node has cluster license, you will need 1 IVS license on the node which has the feaure and advanced licenses
2. in the new licensng scheme where you join 2 nodes where each node has feature and advanced licenses and there is no requirement for clusiter license on any of the nodes, you will need IVS license on both nodes.