[osol-help] b134 - Mirrored rpool won't boot unless both mirrors are present

[William Bauer]

I frequently use mirrors to replace disks, or even as a backup with an esata 
dock.  So I set up v134 with a mirror in VB, ran installgrub, then detached 
each drive in turn.  I completely duplicated and can confirm your problem, and 
since I'm quite comfortable with this process I suggest you have found a 
serious bug and should report it immediately.  This is a horrible problem if a 
mirror member fails and renders a system unbootable!!
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