Activating the degraded array is done only if the root fs is not found, and only if the mdadm package was configured via debconf to do so. There is nothing wrong with this per se, the problem is that the second disk is automatically added back into the array by mdadm --increment. Once the disk has been marked as removed from the array, it should require manual intervention to put it back.
Activating the degraded array is done only if the root fs is not found, and only if the mdadm package was configured via debconf to do so. There is nothing wrong with this per se, the problem is that the second disk is automatically added back into the array by mdadm --increment. Once the disk has been marked as removed from the array, it should require manual intervention to put it back.