docs/162723: gmirror handbook instructions ate my disk

Michael W Lucas mwlucas at
Mon Nov 21 16:30:09 UTC 2011

>Number:         162723
>Category:       docs
>Synopsis:       gmirror handbook instructions ate my disk
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-doc
>State:          open
>Class:          doc-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Nov 21 16:30:08 UTC 2011
>Originator:     Michael W Lucas
>Release:        FreeBSD 9.0-BETA2 amd64
System: FreeBSD 9.0-BETA2 FreeBSD 9.0-BETA2 #12: Wed Sep 7 03:29:55 EDT 2011 mwlucas at amd64

Installed 9.0-RC1/i386 from CD, built & installed RC2.


Tried to mirror my root drive as per

System did not recover from reboot, failing with:

GEOM: mirror/gm0: corrupt or invalid GPT detected.
GEOM: mirror/gm0: GPT rejected -- may not be recoverable

Further research shows that this is expected, and is a result of our
new GPT overlords



Could we get a warning at the top of the page that says "For FreeBSD 8
and earlier. Do not use on FreeBSD 9." ?

We need updated docs, yes, but a warning in the directions would
reduce user annoyance.

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