I have currently my setup on Rackspace. Now, I need to double my Db's capacity (memory). The prices are very high compared to AWS. I need to keep my public IP because of access rules by third parties. Therefore, I am thinking of moving only my Db to AWS and keeping my web server in rackspace (to keep my public IP).
The ping from amazon to rackspace is 0.9-1.2 milliseconds. Do you think this will cause an issue? My web service is an api: there are no web pages involved.
I was thinking of making a vpn between my web server in rackspace and my new aws setup and thus moving my webserver to AWS. That way outgoing connections will still use the same public ip but the lag will be between the incoming/outgoing connections and my webserver in AWS. My humble knowledge in networking tells me that this approach is feasible and better. Is it?