The current design is:
* if a disk is really not present and the array is truly degraded, we should 
not boot unless boot_degraded is true

* if disks are actually present and healthy, yet the array is detected
as degraded => please file a new bug about your case, it should be
fixed.

The reason is that there is disagreement whether it is safe to boot in
degraded mode automatically, because currently we have no default ways
of notifying the administrator that raid is degraded.

There is dataloss potential: boot once degraded of sda, another time of
sdb. Boot with both => syncing can lead to data loss.

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https://bugs.launchpad.net/bugs/872220

Title:
  Fails to boot when there's problems with softraid

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