From owner-freebsd-fs@freebsd.org  Tue Sep 22 21:01:24 2015
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Date: Tue, 22 Sep 2015 15:01:22 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Chris Stankevitz <chris@stankevitz.com>
cc: Matt Churchyard <matt.churchyard@userve.net>,
 FreeBSD FS <freebsd-fs@freebsd.org>
Subject: Re: Name/label/id metadata: how do I make it go away
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On Tue, 22 Sep 2015, Chris Stankevitz wrote:

> On 9/22/15 12:12 PM, Chris Stankevitz wrote:
>> I want to read the man page or source for whatever assigns diskid for
>> glabel to subsequently advertise.  That process, for some reason, only
>> assigns diskids for 10 of my 22 drives.  All drives are the same model
>> number, although the drives have different histories.  (some drives
>> lived in FreeNAS in a former life)
>
>
> According to 'geom disk list', each of my 22 drives has an "ident", but only 
> some of them have "labels".
>
> "ident" is turned into a "label" via a process called "tasting":
>  sys/geom/label/g_label_disk_ident.c
>  sys/geom/label/g_label.c
>
> Although it is not yet clear to me why apparently only some of my disks are 
> "tasted".

Labels on devices that are mounted are "withered" and disappear.