So what is the better solution for HA at the container level.

We are going to use docker not the virtual machine and SAN is not possible as the installation happen on customer data center, so cost matters. 
I also don't know if there is a packaging solution given by IRIS for dockerized setup (not Kubernetes).

I am wondering, if the following image depicts right design. Please assume IRIS deployed as a container. And what kind of minimum hardware configuration required to deploy dockerized IRIS 2024.x?