From owner-freebsd-rc@freebsd.org  Thu Sep 24 11:18:53 2015
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Date: Thu, 24 Sep 2015 14:18:50 +0300
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: "Andrey V. Elsukov" <bu7cher@yandex.ru>
Cc: Andriy Gapon <avg@FreeBSD.org>, cem@FreeBSD.org,
 FreeBSD Current <freebsd-current@FreeBSD.org>, freebsd-rc@FreeBSD.org
Subject: Re: dumpdev in loader.conf vs rc.d/dumpon
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On Thu, Sep 24, 2015 at 11:28:05AM +0300, Andrey V. Elsukov wrote:

> On 23.09.2015 19:57, Andriy Gapon wrote:
> > I do not have a strong opinion.  Either option, rc.d/dumpon change or geom_dev
> > change, is fine with me.
> 
> I added the ability to set dumpdev via loader. But I wasn't aware that
> it was used in rc.d script.
> 
> If you have set dumpdev kenv, it will be already enabled in the time
> when rc.d/dumpon  will be run. So, I think it is useless to try to
> enable dumpdev again. I prefer remove this old code from rc.d script.

rc.d script can redirect dump to device, not available at boot time,
iSCSI disk, for examle.

dumpdev at boot time can be less size, sufficient for dumping at
booting, but insufficient at working time.