From owner-freebsd-questions@freebsd.org  Wed Jun 14 02:03:18 2017
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Subject: Re: Drive labelling with ZFS
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From: David Christensen <dpchrist@holgerdanske.com>
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Date: Tue, 13 Jun 2017 19:02:39 -0700
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On 06/13/2017 04:32 PM, David Christensen wrote:
> Both [1] and [3] discuss the fact that a given drive, partition, file
> system, etc., can be identified in various ways, manual or automatic,
> but the kernel will pick one and "wither" the rest.  Once a GPT label is
> set manually, other methods should be disabled via settings in
> /boot/loader.conf and the system rebooted ([1] p. 35):
>
>     kern.geom.label.disk_ident.enable="0"
>     kern.geom.label.gptid.enable="0"

Beware that all your disks need to have GPT labels, and those labels 
need to be carried forward into /etc/fstab, etc., before you reboot, as 
the kernel won't be able to find the disks using Disk ID or GPT GUID 
labels once those methods are disabled.


David