Small update:

@SirDice thanks but I've already read those two links ;-)

A few days ago I posted that I should upload the logfiles. Because the filesystem is in read
only mode (god knows why) the logfiles cannot be updated.

I know that the system first mounts the filesystem in ro mode but the it should switch to
rw mode which is not happening at my system when I turn full journaling on. Anyway
I'm still searching for a solution, when I find it I'll post it here.