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From: John Nielsen <lists@jnielsen.net>
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Date: Wed, 14 Feb 2007 15:22:12 -0500
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Cc: Ville Lundberg <freebsd@juiceless.net>,
	"Brian A. Seklecki" <lavalamp@spiritual-machines.org>
Subject: Re: gmirror: degraded, Component ad4 (device gm0) broken, skipping.
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On Wednesday 14 February 2007 15:13, Brian A. Seklecki wrote:
> > gmirror insert gm0 ad4
>
> The big question is:
>
> In your example, ad4 has already been "prepped" for use in as a component
> in the gmirror by ....?
>
> Or will it just overwrite anything on ad4 regardless?

No prep is necessary when using raw devices such as ad4. The insert operation 
will overwrite everything (or the first $VOLUME_SIZE blocks) on ad4 with the 
contents of the mirror.

Obviously if you want to use only a portion of a drive as a gmirror consumer 
then the drive should be fdisk'ed and/or bsdlabel'ed and the device name of 
the slice or partition (e.g. ad4a, ad4s1, or ad4s1a depending) should be used 
instead of ad4 as the gmirror consumer.

JN