Date: Mon, 8 Jan 2007 22:43:39 -0300 From: "Fernan Aguero" <fernan.aguero@gmail.com> To: "R. B. Riddick" <arne_woerner@yahoo.com> Cc: geom@freebsd.org Subject: Re: clear metadata using dd? Message-ID: <520894aa0701081743y49420d19u543e46edf7d61e79@mail.gmail.com> In-Reply-To: <20070108231751.78304.qmail@web30310.mail.mud.yahoo.com> References: <520894aa0701081445i43d76098m418ce695d2133e53@mail.gmail.com> <20070108231751.78304.qmail@web30310.mail.mud.yahoo.com>
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On 1/8/07, R. B. Riddick <arne_woerner@yahoo.com> wrote:
> --- Fernan Aguero <fernan.aguero@gmail.com> wrote:
> > I imagine I have to use something like
> > dd if=/dev/zero of=/dev/ad4s3? bs=512 count=1
> >
> > but adding either skip=? or seek=? to taste.
> >
> > gama# fdisk -s /dev/ad4
> > /dev/ad4: 310101 cyl 16 hd 63 sec
> > Part Start Size Type Flags
> > 1: 63 16771041 0xa5 0x00
> > 2: 16771923 146795229 0xa5 0x80
> > 3: 146795292 188742708 0xa5 0x00
> >
> What about "dd if=/dev/zero of=/dev/ad4s3 oseek=188742707"?
gama# dd if=/dev/zero of=/dev/ad4s3 oseek=188742707
dd: /dev/ad4s3: Operation not permitted
gama# whoami
root
> What does "gmirror status" say?
gama# gmirror status
Name Status Components
mirror/gm0 COMPLETE ad4s2
ad6s2
As I said, I had (past time) a mirror on ad4s3/ad6s3, but I decided to
resize s2 and s3,
so I removed ad6s3 from the mirror, reformatted ad6 (dd bs=512
count=79 only) and
moved all data in ad4s3 to it, but this time I put the active 'a'
partition in the s2 slice.
After doing this I rebooted mounting the root fs from ad6s2a and then
I removed ad4s3 from
the mirror and did the same reformatting with ad4.
> I would remove the gmirror-s with "gmirror remove <device> <disk/slice>" (its
> easier than dd)...
IIRC this is what I did.
--
Fernan Aguero
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