After copying the sqllib and successful "db2iupdt db2das", I can start and stop the instance.
However, the DB DAS cannot be activated, because still the "/home/db2das" is somewhere in the configuration (db2 activate db das -> SQL1051N The path "" does not exist or is not valid. SQLSTATE=57019)
A workaround is to put a link /home/db2das -> /db2/DAS.
Actually, I find the wrong homedirectory here an there
-rw-rw-r-- 1 db2das db2das 1512 Jul 10 05:00 sqldbbak
-rw-rw-r-- 1 db2das db2das 1512 Jul 10 05:00 sqldbdir
-rw-rw-r-- 1 db2das db2das 540 Jul 4 05:00 sqldbins
Is there any way to clean the home-directory path in the files?