I have a Head /Tail environment. When I upgrade to SS4, can I use my SS1 Indexing and Document processing servers?

No – you’ll need to have them both on SS4. One reason is the Orchestration FrameWork database will be converted by the head. Then the tail won't be able to connect.  
Another reason is the Orchestration FrameWork database on SS3 or earlier will not transfer over with DCS on SS4. With that said we recommend recreating the Orchestration FrameWork database.

What does that OFW Database contain?

1. The Orchestration FrameWork database contains the following:
   1. If using Distribution it will hold the Distribution jobs

                                                    i.     It is recommended that you recreate your jobs as some of the settings have changed from versions prior to SS4.

1. Pointers/strings to start the document process, distribution / automation jobs and related Orchestration FrameWork settings. The queue information is stored in the Orchestration Framework database.  The Orchestration Framework divides each file extraction process into multiple Stages.  Each stage of the process is represented by a queue and a corresponding executable that resides in memory. As a document is successfully processed through each stage, it is removed from the queue for the current stage and added to the queue for the next stage.

Can I run a dmsconvert on the OFW database?

1. No, Dmsconvert is only for the ProjectWise database.

When you have multiple installations of ProjectWise Orchestration Framework Service, it is recommended that you use the same Orchestration Framework database for all of them.