Hello all,
the reboot worked as planed (only a little late). It took more than 20 minutes because of a slow shutdown of mysql (I will try the trick at [1] next time, maybe it helps). The performance increased not as much as I planed. I will change some more variables and test them with the reboot tonight.
Sincerely, DaB
[1] http://www.mysqlperformanceblog.com/2009/04/15/how-to-decrease-innodb- shutdown-times/