Date: Tue, 15 Dec 2009 16:42:38 -0800 From: Xin LI <delphij@gmail.com> To: xcllnt@mac.com, freebsd-stable@freebsd.org Subject: Re: update to 8.0-RELEASE --> partition gone Message-ID: <a78074950912151642q4922cad8r9fef1aed71a6c941@mail.gmail.com> In-Reply-To: <20091216000803.GA39686@osiris.mauzo.dyndns.org> References: <4B2802AE.9090107@kernel32.de> <200912151720.37709.freebsd@insightbb.com> <4678E8AE-B873-460A-B126-420B9A06B875@mac.com> <20091216000803.GA39686@osiris.mauzo.dyndns.org>
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On Tue, Dec 15, 2009 at 4:08 PM, Ben Morrow <ben@morrow.me.uk> wrote:
> Quoth Marcel Moolenaar <xcllnt@mac.com>:
>> On Dec 15, 2009, at 2:20 PM, Steven Friedrich wrote:
>> >>
>> > FreeBSD 8.0 no longer supports "dangerously dedicated" disks.
>>
>> This is not true. The problem is that sysinstall creates an invalid
>> "dangerously dedicated" disk, as demonstrated by doing:
>> =C2=A0 =C2=A0 =C2=A0 # fdisk ad8
>> =C2=A0 =C2=A0 =C2=A0 (shows FreeBSD slice information)
>>
>> =C2=A0 =C2=A0 =C2=A0 # bsdlabel ad8
>> =C2=A0 =C2=A0 =C2=A0 (shows valid but empty disk label)
>>
>> Marian just needs to wipe out the second sector on the disk to
>> remove the BSD disklabel that prevents the kernel from using
>> the master boot record in the 1st sector. This exposes ad8s1.
>> This then will pick up the BSD disklabel in sector 65 (i.e.
>> the second sector in slice 1) to give ad8s1a...
>
> Are you able to clarify exactly what is no longer working in 8? I've
> read things here and there about dangerously dedicated disks no longer
> being supported, but no detail about what exactly had changed. You seem
> to be implying here that there is only a problem if there are invalid
> and/or overlapping labels on the disk; elsewhere I have read that disks
> without an MBR aren't supported at all (I presume the faked-up MBR on a
> GPT disk counts). If I currently have a working ad2{b,c,d,e}, will they
> be picked up by 8, or would I have to repartition slightly smaller with
> a useless MBR slice in front?
My $0.02: what about labelling them, say, tunefs -L on UFS partitions,
and glabel for swap, then change corresponding entry in fstab. Say:
- Start into single user
- tunefs -L root /
- reboot into single user <--- reboot required after tuning /
- mount -u /; mount -a
- vi /etc/fstab and change "/dev/ad0a" to "/dev/ufs/root"
- umount -a
- tunefs -L other partitions
- mount -a
- vi /etc/fstab and change the rest
- reboot
Cheers,
--=20
Xin LI <delphij@delphij.net> http://www.delphij.net
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