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Date:      Wed, 20 May 2009 10:06:26 +0100
From:      Vincent Hoffman <vince@unsane.co.uk>
To:        Randy Bush <randy@psg.com>
Cc:        Marcel Moolenaar <xcllnt@mac.com>, current@freebsd.org
Subject:   Re: gpart
Message-ID:  <4A13C812.5070206@unsane.co.uk>
In-Reply-To: <m2zld8d1ow.wl%randy@psg.com>
References:  <20090518162253.GA78829@citylink.fud.org.nz>	<20090519100744.GB5943@server.vk2pj.dyndns.org>	<m2iqjxfbsr.wl%randy@psg.com>	<20090519162936.GB1457@carrot.geeknest.org>	<m2r5yldnt7.wl%randy@psg.com>	<20090519171030.GG78829@citylink.fud.org.nz>	<m2pre5dmkz.wl%randy@psg.com>	<BC7D30D0-00ED-4B07-977E-9A3D45383C9E@mac.com>	<20090519190648.GD1050@camelot.theinternet.com.au> <m2zld8d1ow.wl%randy@psg.com>

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On 20/5/09 02:04, Randy Bush wrote:
> as punishment, here is yet another email
>
> so i have it all partitioned using fixit/dist.
>   ad4p1 64k freebsd-boot
>   ad4p2	64g freebsd-zfs (to use as zfs mirror)
>   ad4p3 64g freebsd-swap
>   ad4p4 2tb freebsd-zfs (to use as raidz2)
>
> same for ad5.  ad6 and ad7 have only p1 to join the raidz2.
>
> but i can not build the boot zfs mirror because i can not follow the
> destructions at
>
>     http://lulf.geeknest.org/blog/freebsd/Setting_up_a_zfs-only_system/
>     http://wiki.freebsd.org/AppleMacbook
>     etc
>
> because fixit/dist is a world where i can not mount the zfs pool because
> / is read-only md0.  so i can not set up the bootable zfs mirror system.
>
> and, to add to the fun.  due to time pressure, i go to back off to my
> old faithful hack of small gmirrored boot partitions with big zfs.  i dd
> whomp the base drives (dd if=/dev/zero of=/dev/da4 count=1000000).  but
> it seems not to stomp them.  the sysinstall fdisk partiton editor keeps
> seeing ad4p[1-4]!
>
>   
Try using
gpart destroy -i X da4
where X is the partition index as seen from gpart show
or possibly
gpart destroy da4
I think your problem is that gpt keeps a secondary header at the end of
the disk
http://en.wikipedia.org/wiki/GUID_Partition_Table


Vince

> coffee or sleep, tough call.
>
> randy
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