gmirror failed with error 19.

Sascha Klauder sascha at
Fri Oct 28 10:28:27 UTC 2011

On Tue, 2011-10-25 12:27 -0700, Garrett Cooper wrote:
> On Tue, Oct 25, 2011 at 11:15 AM, Martin Wilke <miwi at> wrote:
> > I face the same error since upgrade from 8.2 to 9.0RC1, is there any way to fix that?
> errno == 19 => ENODEV -- so the question is, what device is missing?

 I've got bitten by this as well when trying a source up-
grade of a freshly installed 8.2-RELEASE system that had
gmirror configured after installation according to the 
procedure in the Handbook.

 The 9.0-RC1 kernel drops to the mountroot prompt when
booting with

 GEOM_MIRROR: Device mirror/gm0 launched (2/2).
 GEOM_PART: partition 1 has end offset beyond last LBA: 490350671 > 490350670
 GEOM_PART: integrity check failed (mirror/gm0, MBR)
 Trying to mount root from ufs:/dev/mirror/gm0s1a [rw]...
 mountroot: waiting for device /dev/mirror/gm0s1a ...
 Mounting from ufs:/dev/mirror/gm0s1a failed with error 19.

which can be circumvented by setting the loader tunable

 The only immediately obvious difference I could find is
that "gpart list" reports the last sector of the mirror/gm0
device different from the 8.2 kernel (490350670 vs 490350608).

"gpart list" output when running the 8.2-RELEASE kernel: 
vs 9.0-RC1:

Image of the MBR:


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