I'm just wondering what people typically mean by these terms and what the difference is. We're procuring a new application at work, and we've been having the various reps in to talk about their particular application solution. Various vendors and other staff on the purchase review committee seem to be using different definitions for these terms, so I was hoping to get a bit of consensus. For example, one vendor offers 2 servers, each with multi-path connections via redundant FC switches to the application-SAN. Optionally, they can provide a 3rd lower-end server with a DAS to provide operation with limited (the most recent) data, and limited performance, in the event that both main app servers or SAN are down. The other guys at work are now praising the vendor (of quite a poor product) because of their disaster recovery provisions. I seem to be a lone voice, in saying that it isn't disaster recovery but DR is irrelevant; we are purchasing a "bulk data store" from a 3rd party. This will receive the data from the app servers, and archive it for permanent storage. The application SAN will, in effect, be relegated to the role of cache. In my view, the DR comes from the bulk store - if the app servers/SAN die, then the system can be restarted with clean servers which will populate from the bulk store. Amiright?