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Date:      Mon, 5 Jan 2015 20:04:34 -0700 (MST)
From:      Warren Block <wblock@wonkity.com>
To:        Bob Willcox <bob@immure.com>
Cc:        Kevin Oberman <rkoberman@gmail.com>, Chris H <chrish@ultimatedns.net>, FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org>
Subject:   Re: I need some swap partion help on new 10.1 install
Message-ID:  <alpine.BSF.2.11.1501051957390.30334@wonkity.com>
In-Reply-To: <20150105225028.GC57206@rancor.immure.com>
References:  <20150102144223.14a2987e@nunki.holyordnance.org> <20150102215604.GF867@rancor.immure.com> <20150102145801.6ea92658@nunki.holyordnance.org> <6b9041859ceb265eedaf6f56f9178a7b@ultimatedns.net> <20150102163539.1eaadbc7@nunki.holyordnance.org> <20150103172527.GI867@rancor.immure.com> <745af5f28074a940e743f6094be15991@ultimatedns.net> <CAN6yY1tAZfp-nDqhYrd63hcxA%2BBKayF3FypOeNvk5cY3e125sg@mail.gmail.com> <54A88D7B.8010901@protected-networks.net> <alpine.BSF.2.11.1501041836540.33242@wonkity.com> <20150105225028.GC57206@rancor.immure.com>

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On Mon, 5 Jan 2015, Bob Willcox wrote:

> On Sun, Jan 04, 2015 at 06:37:18PM -0700, Warren Block wrote:
>> On Sat, 3 Jan 2015, Michael Butler wrote:
>>
>>> On 01/03/15 19:35, Kevin Oberman wrote:
>>>
>>> [ .. snip .. ]
>>>
>>>> As per an earlier suggestion, did you put:
>>>>  kern.geom.label.gpt.enable=0
>>>> into /boot/loader.conf? If so, that's why you lack a /dev/gpt label. This
>>>> is usually a "friendlier" string than the diskid, but both work equally
>>>> well.
>>>
>>> bsdinstall does that on its own - you have to manually
>>> remove/comment/set to "1" after installation :-(
>>
>> gpt, or gptid?  The first would be a terrible regression, the second,
>> not so much.
>
> The more I read of this thread the more confused I get. What should I have in
> /boot/loader.conf to get the old behavior with more traditional device names?
>
> Also, if bsdinstall doesn't do this for me automatically, why did it put
> /dev/ada0p2 in the fstab for swap?

The best way is to use GPT labels, which are stored in the GPT header. 
They are portable, so keep working if the drive device name changes 
(ada0 to da1, say).

GPT labels can be set with gpart modify.  The labels appear in 
/dev/gpt/.  As mentioned before, they might not appear if a partition is 
mounted due to GEOM "withering".

GPT labels are enabled by default.  If bsdinstall is disabling them, it 
is a regression.

GPT IDs, on the other hand, are a unique generated ID code that can 
appear at the same time.  Many of us find them not very useful and 
disable them in loader.conf.

I have only upgraded systems to 10.1, so don't know what bsdinstall does 
on a new install.



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