On 2016-09-16 01:04, Zaphod Beeblebrox wrote:
>     Are you using zvols to back the VMs? Make sure they are in 'volmode=dev'
>     not 'geom' (the default), or GEOM will lock the device when it detects a
>     partition table being written to the zvol (from the installer inside
>     the VM)
>     Note that this setting requires you to export/import the pool or reboot
>     to apply.
> No, no.  The whole point here is that I was booting the raw disk. 
> "ada1" as it were.

You might try the dangerous 'shoot yourself in the foot mode' for geom:

man 4 geom:
0x10 (allow foot shooting)
        Allow writing to Rank 1 providers.  This would, for example,
        allow the super-user to overwrite the MBR on the root disk or
        write random sectors elsewhere to a mounted disk.  The
        implications are obvious.

sysctl kern.geom.debugflags=16

Allan Jude

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