Save current db cfg from all your DBs to separate files.
A useful script you can use to keep track of you actual db configuration before migrating to another version of DB2.
for i in `db2 list db directory | grep "Database name" | tr -s " " | cut -f 5 -d " " | sort | uniq`;
do `db2 +o connect to $i && db2 get db cfg show detail > $i.txt; db2 +o terminate;`;
done;