without considering DMS in a device, normally, the simplest choices are SMS
or DMS in files.
Is there any performance improvement using a DMS tablepsace container in a
file instead of a SMS ?

We are just starting to use DB2.  I have a question about Control Center and
port 523.  Our DBA set up a database that listens on port 30280 (I have no
idea where that port number came from...).  Our security guy opened that
port so I can access it from my workstation.  It seems to ...