DR solution options

Hi,I need to create a DR environment for the production middle tier.  I am in the beginning stage, but one thing I am not clear on is the state of the database.  In my environment I have two databases, one metadata database which holds the webcenter and ucm schemas, and another database which holds, among other schemas, the online user, webcenter schema (data source connects to this database).  Since this is a DR environment, the two databases are only mounted and in managed recovery mode.  I am not clear how can I keep the middle tier up if it can not