Hi!
On Thu, Feb 24, 2011 at 02:32:43PM +0200, Dotan Cohen wrote:
> I need to dd or cp my laptop's harddrive over the LAN. For a reason
> that I'd rather not get into I cannot remove the drive from the
> laptop.
>
> Should I just use scp to copy over the LAN? Something like this?
> scp -r / root@178.63.65.136:/
Well... SSH has some overhead because it does encryption - you simply cannot
have encryption without _some_ overhead.
I would recommend rsync instead - simply because if things go wrong during the
copy, it can pick up from where it left, rather than restarting from scratch:
rsync -av --numeric-ids / root@otherhost:/
--numeric-ids is to ensure it uses the _numeric_ user/group IDS on the other
side. You may find that some users have differnt IDs between machines - e.g.
IDs that are added by packages (e.g. mysql and stuff).
> Can I actually use dd over the network, maybe by piping to scp
> somehow? What is the canonical way of doing this?
> Thanks!
Yes - if the disks are the same size, it's a no-brainer. My personal preference
for this is to use "nc" - which is lightweight, but does not do encryption.
On the "source" machine, send it out over the network
sourcebox:~# dd if=/dev/sda | nc -l -p 9999
and on the destination box - which should be running a "live CD" or similar, as
blasting over a disk which is in use leads to kernel confusion and human
madness:
destbox:~# nc $IP_OF_OTHER_BOX 9999 | dd of=/dev/sda
You may want to use gzip to trade off CPU usage for better network bandwith:
sourcebox:~# dd if=/dev/sda | gzip | nc -l -p 9999
destbox:~# nc $IP_OF_OTHER_BOX 9999 | gunzip | dd of=/dev/sda
Hope this helps
--
Karl E. Jorgensen
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