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Date: Wed, 14 Dec 2011 01:11:58 +0900
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From: Randy Bush <randy@psg.com>
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Subject: 8.2->9.prerel: gmirror failed with error 19
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csup
make buildworld
make kernel
boot single

    root mount waiting for: usbus4
    uhub4: 8 ports with 8 removable, self powered
    Trying to mount root from ufs:/dev/mirror/boota [rw]...
    mountroot: waiting for device /dev/mirror/boota ...
    Mounting from ufs:/dev/mirror/boota failed with error 19.

the only way out was via loader

    OK unload
    OK load boot/kernel.old/kernel
    OK load boot/kernel.old/geom_mirror.ko
    OK set kern.geom.part.check_integrity=0
    OK set vfs.root.mountfrom.options=rw
    OK boot -s

this would work with the 8.2 /boot/kernel.old but not with the 9.fresh
/boot/kernel

randy