Hi again, the solution was to restart the server (the HDD was hot-swaped). Then in the Raid-BIOS I was asked whether I want to rebuild, which I acked. After this, linux began to rebuild it. So initiating the rebuild seems to be brocken, but not the rebuild process itself. Best regards, Michael Fritscher -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html