Jim,  as far as i know SRDF/DM is designed for migration purposes only, it does not offer any consistency. It's the same as running SRDF in acp_disk mode where data gets sent over the wire in any order possible, so copy of data on the R2 is not consistent.  So if you bring R2 online and data is recoverable (in database case"), you might be missing transactions.
I have a HP-UX 11.31 system that I use Timefinder and SRDF to replicate from the local DMX4 to a remote DMX4.  There are three volume groups that I have created three separate TF/SRDF device groups.  Each device group is synchronized separately.  I have heard about consistancy groups but I am not sure how to combine the three device group to synchronize all at once so they are consistant.  One volume group is vg00 (OS), one is the oracle database files, and the other is the application.  This system is a virtual HPUX system create with HP's VSE virtualization software.  I have tested bringing up the R2's on a virtual system on the remote site and it seems to work fine.  I just want to make sure all volume groups are in sync as close  as possible. 
How to create TF/SRDF Consistancy group