Supported Topologies (Workflow Manager 1.0)
Updated: July 10, 2012
The following topologies are supported:
SQL Server can be installed on the same physical machine with Workflow 1.0 and Service Bus, or on a different one.
The Service Bus databases can reside on multiple machines as well. All of them need not be created on a single database server.
Workflow Manager 1.0 MSDN Community Forum