If you have used a symbolic link to the chunk, as described in the
Administrator's guide, you can take a level 0 archive, close down the
engine, re-establish the link to the new disk area, and restore.
If you haven't used symbolic links, you'll have to dbexport or
tb/onunload your database(s), re-create your database on the new chunk,
and dbimport/onload.
Neil