Hi, I installed ubuntu 12.04 64 bit server by setting the raid 1.
I waited for the synchronization, rebooted the system.. all ok so I decided to do a test to see if the properly with only one disk. If I use only the first disc the system starts properly but if I use only the second disk the system will not start: the system reboot. I also tried to connect the second disk to the same cable of the first disk but the problem still remains .
I've done tests with different hardware, also swapping the two discs ... the problem is always the same. The disc number 2 does not boot properly but rather the PC will restart.

Do you have any suggestion ?

Best regards