*** This bug is a duplicate of bug 942106 ***
    https://bugs.launchpad.net/bugs/942106

i can't tell from the initial description whether or not there was a
truly degraded array on his system.  perhaps not, in which case the
fixes described in #942106 would help.

but since the topic of this bug very precisely describes my current
issue, and my issue is definitely not a duplicate, i'm commenting here.

i'm running oneiric.

my root fs is _not_ a RAID disk.

i have a single mirrored RAID pair, which is _not_ mentioned in
mdadm.conf.

this pair is _always_ degraded, intentionally so.  so it's clearly
important for my system to boot with it in a degraded state.

[rationale, for the curious:   the disk stores my BackupPC backup pool,
which is extremely difficult (impossible, really) to copy (for offsite
purposes) with standard rsync/cp tools, due to its huge numbers of
hardlinks.  it could be copied using dd, but that would involve taking
the disk offline for long periods.  instead, i do my backups to one half
of a degraded RAID.  when i want a copy for offsite storage i add the
missing disk, sync it (which all happens with the pair online), then
(the next day, when syncing is done) briefly shut down BackupPC, unmount
the RAID pair, manually fail the offsite disk, remove it, and remount
the now-degraded pair.]

clearly, setting BOOT_DEGRADED will fix (i hope) my problem -- i only
have one RAID, and maintain it in a somewhat unusual way.

but i've been thinking of using RAID for my root disk soon.  if i do, i
may well not want to set BOOT_DEGRADED.  so i'll be stuck.

here's the critical part of the original description:  "The complete
solution will be to provide BOOT_DEGRADED on a per array basis."   and,
as a corollary, booting shouldn't be prevented when degradation is
detected in an array that's not even configured.

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https://bugs.launchpad.net/bugs/917520

Title:
  Regression: mdadm drops to initramfs shell on unregistered array

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