[Bug 232671] [gmirror] gmirror fails to recover from degraded mirror sets in some circumstances

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232671

--- Comment #4 from Conrad Meyer <cem at freebsd.org> ---
Oh, and one more thing to consider: gmirror is really aggressive about
destroying itself when it gets into a bad state.  That might not be the best
thing for resiliency, even if all mirrors are dead?  I.e. it could stay alive
and ENXIO or EIO all IO and wait for an administrator to add or remove disks
(or administratively kill it).

This is mostly orthogonal to this bug, except I'd like gmirror's self-destruct
function to log much more explicitly than it does today.  The only hint we have
during the boot process is: "root_mount_rel[2352] 0xppppppp", and that only
because we have GEOM debugging level 1 enabled!  If a CAM device dies and
removes itself, you bet the console hears about it.  Just my 2¢.

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