Giorgos Keramidas wrote:
On 2006-02-09 14:36, Martin McCormick <[EMAIL PROTECTED]> wrote:
After installing FreeBSD5.4, the ISC dhcp server and ISC bind
on a hard drive, I wanted to clone that drive to a second drive so as
to generate a second server, using what I had already installed as a
template. I used the following command:
dd if=/dev/da0 of=/dev/da1 bs=512
It turns out that dd defaults to 512-byte blocks so I didn't
really need the bs=512, but I am not sure I haven't made some other
type of mistake. The dd command has been running for about 4 hours on
a very fast system, with a 1-gig processor, 1 gig of RAM and two 31-GB
drives. One would think it should have finished by now, but it is
still running. Is this a valid method of copying the entire contents
of one drive to another? Thank you.
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 :)
I had to clone a couple systems a while back, and I also did it with
dump/restore. The best part was this was the first time I actually
restored my backups to a bare hard drive. It gave me a lot of
confidence that my backups actually work. I think a lot of people find
out too late that whatever backup solution they're using is flawed and
they can't rebuild their system from it.
--
Ken Stevenson
Allen-Myland Inc.
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