I was thinking about one of the most challenging aspects with DR procedures, IP changes. This is a very common problem. Although changing the IP address of a VM is usually straight forward it doesn’t mean that this is propagated to the application layer. Many applications use hardcoded IP addresses and changing these is usually a huge challenge.
But what about using vShield Edge? If you look at how vShield Edge is used in a vCloud Director environment, mainly NAT’ing and Firewall functionality, you could use it in exactly the same way for your VMs in a DR enabled environment. I know there are many Apps out there which don’t use hardcoded IP adresses and which are simple to re-IP. But for those who are not, why not just leverage vShield Edge… NAT the VMs and when there is a DR event just swap out the NAT pool and update DNS. On the “inside” nothing will change… and the application will continue to work fine. On the outside things will change, but this is an “easy” fix with a lot less risk than re-IP’ing that whole multi-tier application.
I wonder how some of you out in the field do this today.