I am developing a website that has one production environment and DR environment(disaster recovering). In each environment i have three web servers and they need to have a shared storage to store some files like images. So i am thinking of have one SAN deployed for each environment. However, the two SAN in each environment has to be synchronized. In case production is done, users can access DR with same files.
So my question is is there a way to synchronized two SAN two way? No matter i write to any SAN, it will be synchronized to the other SAN.
Any other suggestions except using SAN is welcome for example using NFX.