Forgot to mention these are laptops (for primary use), so it will have to be over a network, (or from a CD?)
-----Original Message----- From: Gary Stainburn To: Phil Driscoll; Chris Puttick; 'suse-linux-uk-schools@suse.com' Sent: 1/22/03 9:24 AM Subject: Re: [suse-linux-uk-schools] Cloning machines
On Wednesday 22 January 2003 10:10 am, Phil Driscoll wrote:
On Wednesday 22 January 2003 8:48 am, Chris Puttick wrote:
I know I should be able to do this, but many years of using Ghost
have
made my brain go soft. Can someone talk me through cloning 12
identical
machines? I was assuming something like tar, tftp and lilo, but the
sites
I found on the subject just confused me...
I did this yesterday on my own machine when my main hard disk
overheated
and started making funny noises - however I had the new and old hard
disks
connected to the same machine.
All I had to do was dd if=/dev/hda of=/dev/hdb - although I had to do
much
agonising before hitting return just to make sure I was doing the copy
in
the correct direction. Note that this takes ages as you copy the
entire
disk surface, not just the area covered in files, and the destination
drive
has to be at least as big as the source.
This also has the problem that if the two drives don't have the same geometry it may not work. Generally if they have the same number of heads and sectors and the cylinders is greater on the target you'll be okay. It does work in other circumstances but it's not guaranteed. It's a case of suck-it-and-see.
Also, bear in mind that if the source is mounted at when you're copying, you may end up with an inconsistant target with filesystems needing fscking etc. If you're going to do this, I'd suggest switching to runlevel 1 to close down as many services as possible, and 'sync' before starting. If possible unmount or remount read-only whatever you can.
For best results, run your system from a 3rd HD.
I've not done this over a network, but if I had to, my instinct would
be to
boot up a floppy based distribution (maybe keeper?) and arrange things
so
that I could see the source drive or a tar.gz image of it somewhere
over
the network, and then use the dd command to do the work.
I would try and avoid even a modest clone over a network these days. The smallest drive CCL sells is a 30GB disk. Without doing any maths, I would say that even over a 100MB LAN, that's going to take a while, and that's after all the other technical problems.
However, I'm sure that someone who actually knows what they are doing
might
be aware of a better way :)
Cheers
-
Chris Puttick