On Fri, 19 Nov 2010, Björn Englund wrote:
Should I try mdadm -A -f /dev/md12 or do I need to run a create command to get the array up and running?
Doing a create is always the last measure to try. Forcing re-assembly is a gazillion times safer because you can't get the data-disks in wrong order.
Make sure you have the latest mdadm (3.1.4 I believe) and force-assemble the array and see if that works.
-- Mikael Abrahamsson email: swmike@xxxxxxxxx