Check this out...Rim doesnt support clustering for dr in an event of a failure but when we brought this up 2 years ago, they said thats the best way it would work and thats what they would reccomend off the books.

1. for SQL, set up a SQL Server at your DR Site, set replication of the critical besmgmt files you need. Configure it to be the same way (login, apps installed, etc).

2. For Domino servers, set up the cluster server at dr site with their own lotus id's and bring them up online and let them stay online for replication purposes. Install BES and copy all the State DB's to the proper directories.

3. On the desktop, keep the ini and id file of the Headquarter's bes server.

4. In an event you need to switch, swap INI and ID file and bring up domino server.... this is of course you change the dns address, ip address, make the changes you need on the server document when you create the cluster server (s).

We have been using this solution and its quite easy especially with 4.0.