I understand, I do not think that we need instant mirroring, our setup after torromow (because I am making some changes) will be:
--Internet --> load balancing ---> application servers (3x) ---> backend high throughput DB (Oracle 9i).
I am looking into DB replication because it is only the DB that needs to be mirror.
Now I am trying to convincing the Pres.. to buy a SAN's device, for stability and performance, then if we want to we can mirror that device with another SAN's in location B.
But he wants the data to be "instant" for marketing and so location A can handle the east coast and location B can handle the west cost.
I was thinking about ISCSI and mirroring the two DB servers.
I guess we will see - I agree that it will be very expensive because of the cost ($ per GB transfered) to ISCSI the data across a network.
Can you use ISCSI over VPN, since it is IP based ? I would assume yes.