db2 9.7 -> 10.1 upgrade problem

Hello again :) ,

I am trying to upgrade my db2 from 9.7 to 10.1.

I installed as root the db10.1 binaries in parallel with 9.7, deactivated the dbs, disabled hadr, stopped instance etc

I ran as root the db2iupgrade tool (/db2/V10.1/instance/db2iupgrade -u db2inst db2inst)

and I get the following error from the logs
/db2/db.DOOS01/db2inst has of course the proper rights.

Any help?