Re: dd if=/dev/hda

[Damacus <damacus@bastion.yi.org>]

I used to do that to duplicate hard drives when I was helping one of my
teachers set up a school computer lab at Springfield High School.

It worked just fine, as we made sure nothing else was running on the system...
killing a couple processes first to prevent freak accidents.

One thing that would always happen, when we stuck the drive with data copied
to it into another system, FSCK would run saying that the system hadn't been
unmounted cleanly (ie, mtab showed it mounted, as that was the status of the
mtab on dd time).

All in all, it's just a quick hack.

On Mon, Apr 01, 2002 at 05:35:29PM -0600, Charles Menzes wrote:
> when i was working at my last job, i saw a guy doing something of a 
> nightly "backup" on his system by doing
> 
>   dd if=/dev/hda of=/dev/hdc		
> 
> or something along those lines. i am not certain if there were any other 
> flags being used or not. regardless, i remember someone in the unix group 
> freaking out that it was being done. 
> what are the risks of such an action? the guy doing it claimed he was well 
> safe since the two disks being "mirrored" were identical, same brand, same 
> model, etc... the guy complaining, complained with facts that were frankly 
> way past my understanding. can someone comment on the why's not to do 
> this? or why its okay.
> 
> thanks -c
> 
> 
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