@sdetweil , @kristjanesperanto ,
I’ve decided to resolve it by myself - with Sam’s hint/advice/helper-file.
It seems to work - will double check my cache size in a few days.

Thanks again for your great support.
Migration is a bigger task and wihout any need currently too much - even cache-growth wouldn’t change this.

• never touch a running system :-)

Warm regards,
Ralf