On Fri, Jul 5, 2013 at 12:10 AM, Jan Kesten <j.kesten@enercast.de> wrote:
i tried to scrub the keyspace - but with no success either, the process threw an exception when hitting the corrupt block and stopped then. I will rebootstrap the node :-)

http://www.datastax.com/docs/1.1/install/upgrading

Did you try offline scrub?

=Rob