[x] methods specific to StorageParticipant
[o] redis -> @redis

[ ] 1 ::Redis instance per thread ? (instead of :thread_safe => true)
[ ] update to redis-rb 2.0 (which has sthing about threads)
    http://blog.citrusbyte.com/2010/05/14/redis-rb-200/

[ ] double-check for deletion of old keys