HP StorageWorks XP Fast Recovery Solution administration guide: Windows Server 2003 (B9552-96004, September 2005)

Configuration 41
Important Exchange 2003 configuration notes
FRS works within the limits of Exchange 2003. No more than five
databases per storage group and no more than four storage groups per
Exchange instance are supported.
FRS manages Exchange 2003 at the storage group level. The following
configuration rules apply:
• All databases within a storage group must reside on one LUN of the
HP disk array. Databases cannot be separated onto different storage
LUNs.
• The logs for each storage group must also reside on an HP disk array
LUN, and the logs and the checkpoint file must remain together on the
same LUN.
The LUN that the databases reside on and the LUN that the logs reside on
must NOT be the same LUN.