identical disk dump

[Mike McCarty]

Les Mikesell wrote:
> On Tue, 2006-02-14 at 12:36, Mikkel L. Ellertson wrote:
> 
> 
>>>I need to make an identical bit-for-bit transfer of a hard disk from a
>>>*REALLY* slow box to a faster box.
>>>
>>>1- There are no security issues --plugging one box directly into the other.
>>>2- I need to prove/document the copy is identical to the original.
>>>3- I want to do it as efficiently as possible.
>>>4- I "own" both boxes.
>>>---
>>>Has anyone used dcfldd ?? Is this a better tool than dd ??
>>>http://dcfldd.sourceforge.net/
>>>---
>>>Any time-tested commands/flags/scripts would be greatly appreciated.
>>>
>>>Best wishes to everyone,
>>>
>>>Andrew
>>>
>>
>>If you are going from one box to another, then dd type tools are
>>not the right tool for the job. You may want to take a look at
>>Ghost 4 Linux ( http://freshmeat.net/projects/g4l/ ) This also
>>has the advantage that the drives are not mounted during the
>>copy, so you do not have to worry about something changing while
>>the drive is being copied. You do NOT want to do a bit-for-bit
>>copy of a mounted drive!
> 
> 
> You can use dd even across machines if you can boot a
> run-from-CD distro that has ssh like knoppix.  Set a root
> password and start the ssh server on the remote box
> and use a command like:
> dd if=/dev/hda |ssh remote_ip dd of=/dev/hda
> However, to use dd the disks must be the same size. If this

Actually, they need to be identical drives. Just being
the same size is not enough.

[snip]

Mike
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