Comment 22 for bug 872220

Clint the issue is that it does this regardless of whether the device is a boot device or not and this makes the system unbootable if you have 1 disk from a RAID 5 array attached to it.

1. Set boot degraded to false, result: you get a prompt asking if you want to try boot degraded
1.a Answer no, it drops you into the debug shell
1.b Answer yes, assemble degraded fails, it drops you into a the debug shell
2. Set boot degraded to true, result system tried to attach the degraded array, assemble fails, system drops into the debug shell.