I can confrm the bug. after boot, in intramfs busybox, the array is installed but in inactive state. The array can be started with
mdadm --run /dev/md0 the array will start as expected in degraded mode, but this doesn't solve the issue. It should be done automatically at boot. Testing config: virtualbox with 2 disk (MBR) configured in raid 1 Tried with and without LVM. Detaching a disk and booting the os fire up busybox. Fully reproducible Still working on
