From owner-freebsd-rc@freebsd.org  Thu Sep 24 11:45:56 2015
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Date: Thu, 24 Sep 2015 14:45:54 +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 02:37:39PM +0300, Andrey V. Elsukov wrote:

> On 24.09.2015 14:37, Slawa Olhovchenkov wrote:
> > For example, host with 3TB of RAM, booted from small SSD.
> > This SSD have 16GB slice for dumping. This is sufficent if trouble
> > happen at boot time. This is insuuficient if trouble happen later,
> > after using all 3TB. rc.d script can be used for select iSCSI
> > destination, for dumping after succesefull boot.
> 
> Did you read dumpon script and saw how it uses dumpdev tunable?

This is script try it in case dumpdev=auto, before trying swap
partition.