If you have legitimate requests for rack space being turned down then you don't really have just enough space for what you need.Hmmm this is an issue as we're seriously strapped for rack space.
We now have a caged area in the single server room with just enough rack space for what we need.
If "wrong" means too low then that will definitely help. I saw a case with a customer DB where a table with many small records was put in the wrong area, so the RPB was too low. Dumping and loading to an area with appropriate RPB gave us a 5x reduction in disk usage for the same data. The change also considerably reduced physical I/O and improved cache efficiency when reading that data, and reduced memory pressure on other data, all of which improve application performance.Once we have a chunk of contiguous disk space a dump and load should bring that down significantly as we have some tables in a really wrong RPB configuration.