Date: Fri, 10 Feb 2006 12:29:19 +0200 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: Kevin Kinsey <kdk@daleco.biz> Cc: freebsd-questions@freebsd.org Subject: Re: Using dd to Make a Clone of a Drive Message-ID: <20060210102919.GA1056@flame.pc> In-Reply-To: <43EBE2F8.8000501@daleco.biz> References: <200602092036.k19KaIhn086956@dc.cis.okstate.edu> <20060209220123.GA4751@flame.pc> <43EBE2F8.8000501@daleco.biz>
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On 2006-02-09 18:48, Kevin Kinsey <kdk@daleco.biz> wrote:
>Giorgos Keramidas wrote:
>> Bah! That's too slow for my taste. I would usually go for a newfs,
>> dump, and restore option. For instance, to create a copy of /usr on a
>> second disk:
>>
>> newfs -U /dev/ad1s1a
>> mount /dev/ad1s1a /mnt
>> dump -0 -a -L /usr | ( cd /mnt ; restore ruvf - )
>>
>> Copying with dd(1) is not as fast :)
>
> Sorry to butt in --- but I'm needing to start cloning too. Looks
> like a winner to me ... wouldn't this have the added advantage
> of making "same size and geometry" (cf. Erik Trulsson, 4 hours ago,
> this thread) less relevant?
Yes, this is pretty much the important point :)
> As long as the "new" slice had enough space, geometry shouldn't
> matter to dump|restore .... <?>
Right :) It also allows restoring in a different partition layout.
I used this recently to 'recover' my laptop's installation, using a
spare partition. Before running 'installkernel' and 'installworld',
a backup of my root, /var and /usr partitions was saved with:
# cd /home/backup
# dump -o -aL -f root.ad0s1a /
# dump -o -aL -f var.ad0s1d /var
# dump -o -aL -f usr.ad0s1e /usr
A 'copy' of the original /, /var and /usr was restored in ad0s2a, which
was a single UFS partition, large enough to hold a restored copy of my
old /, /var and /usr partitions:
# newfs -U /dev/ad0s2a
# mount /dev/ad0s2a /mnt
# ( cd /mnt; restore -ruf /home/backup/root.ad0s1a )
# ( cd /mnt/var ; restore -ruf /home/backup/var.ad0s1d )
# ( cd /mnt/usr ; restore -ruf /home/backup/var.ad0s1e )
Then, when things went totally nuts after the installation of a new
system on ad0s1* partitions, I could still boot from ad0s2a and restore
my old backup copies from /home :)
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