Date: Mon, 01 Aug 2005 15:21:34 -0700 From: garys@opusnet.com (Gary W. Swearingen) To: "Alexandre D." <alexandre.delay@free.fr> Cc: freebsd-questions@freebsd.org Subject: Re: Migrate primary disk (duplicate) Message-ID: <a94qa947td.qa9@mail.opusnet.com> In-Reply-To: <MAEBLPAGHGPMOKCBICBNMEKKCHAA.alexandre.delay@free.fr> (Alexandre D.'s message of "Mon, 1 Aug 2005 18:59:27 %2B0200") References: <MAEBLPAGHGPMOKCBICBNMEKKCHAA.alexandre.delay@free.fr>
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"Alexandre D." <alexandre.delay@free.fr> writes:
> Here is the complete process I follow:
>
> sysctl kern.geom.debugflags=16
> dd if=/dev/zero of=/dev/${disk} bs=1k count=1
Shouldn't be needed, but if you're concerned, write enough sectors
to zero the start of {disk} and the start of {disk}s1 -- something
like 63+16; bs=100k maybe.
> fdisk -BI ${disk}
Again, -B and -I don't sound like a good combo.
> disklabel -B -w -r ${disk}s1 auto
You said you were running 5.4. AFAIK, there's no "-w", "-r", and no
"auto". Other than that it looks fine. :) (But knowing the way some
developers think, they might have been removed from the manpage only.
Grrrr.)
> disklabel -R ${disk}s1 generique.disklabel
> newfs /dev/${disk}s1a
> newfs /dev/${disk}s1d
> mount /dev/${disk}s1a ./mnt
> cd ./mnt
> dump 0uafL - / | restore xf -
Looks like you're dumping to a file named "./mnt/L". Does ./mnt
really have anything else in it after that restore?
> -----generique.disklabel file-------
> a: 41943040 0 4.2BSD
> b: 2097152 * swap
> d: * * 4.2BSD
Could be. Have it print out the resulting disklabel and see if looks
OK.
> If I do the same with /stand/sysinstall in stead of
> dd if=/dev/zero of=/dev/${disk} bs=1k count=1
> fdisk -BI ${disk}
> disklabel -B -w -r ${disk}s1 auto
> It works well.
Could it be because it uses "boot0cfg" and you use "fdisk"?
(You haven't said whether you're telling sysinstall to install a
standard MBR or a FreeBSD MBR or none.)
If you're curious, you can dump the two main boot sectors
a readable file and compare the sysinstall version with the
fdisk version and /boot/mbr and /boot/boot0.
dd if=/dev/ad0 count=1 | hd >/tmp/ad0
dd if=/dev/ad0s1 count=1 | hd >/tmp/ad0s1
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