We have a Windows Server 2003. This server is used for the following purposes/roles: Web-Application, SQL Server, and Terminal Services. As the company is growing we are becoming more and more dependent on the server and its dependability is becoming more and more important and crucial. So I have been asked to look into a failsafe setup with Active-Passive configuration. Therefore, in the event the Active server hardware goes down the passive server will take over till the Active server is repaired.
The current server is a custom built machine.
My question is where would I start and how plausible is this solution given the server role and our current hardware.