[clue] Oops, I did it again...

[David L. Willson]

sda and sdb will get dd'd into files on the great big new drive, as soon as I have time. For now, they've been pulled out of the system and are waiting patiently.

What I need is a script that goes something like:

Read a block from sda, read a block from sdb.
If they're the same, overwrite the block from sdb with zeroes.
If they're different, quit.
Read the next block from sda and sdb. Repeat.

Since nobody's produced such a thing, I suppose I'll have to write it...

David L. Willson
Trainer, Engineer, Enthusiast
RHCE MCT MCSE Network+ A+ Linux+ LPIC-1 NovellCLA UbuntuCP
tel://720.333.LANS
Freedom is better when you earn it. Learn Linux.

----- Original Message -----
> I suspect that you  don't have any other backup of the sdb drive?
> yeah. I've been there.  Sucks to be you right now. :-(
> 
> At this point the most important thing is to preserve the state of
> what you have.  I hate to say it but you might want to dd what's left
> of /dev/sdb to some static storage like a usb drive.
> Step 2 is to try to fsck with some alternate superblock.  With luck
> you'll get a file system back from that.  After that its pretty much
> catch as catch can as to what will work.
> If you know how much got over written you can write back that amount
> from a newfs'd drive and retry the fsck.
> 
> On Mon, Jul 25, 2011 at 3:00 PM, David L. Willson
> <DLWillson at thegeek.nu> wrote:
> > Damn it, dd! Stop doing what I say! Or at least warn me... Ugh...
> >
> > I ~meant~: $ dd if=/dev/sda of=/dev/sdc
> > but I said: $ dd if=/dev/sda of=/dev/sdb
> >
> > /dev/sdb ~had~ important stuph on it.
> >
> > Now, it has an in-determinate amount of garbage copied verbatim
> > from
> > /dev/sda, as much as it could copy before I read what I'd written,
> > shrieked,
> > and filled the keyboard buffer with <CTRL>+c's followed by some
> > important
> > stuph I might never see again.
> >
> > Sigh...
> >
> > I think step 0 of my "get some back" plan is to zero out the bit of
> > /dev/sdb
> > that matches /dev/sda, in order to get rid of the bogus information
> > at the
> > beginning of the disk. Anyone have a script handy?
> >
> > Links for when I get to steps 1-99?
> >
> > David L. Willson
> > Trainer, Engineer, Enthusiast
> > RHCE MCT MCSE Network+ A+ Linux+ LPIC-1 NovellCLA UbuntuCP
> > tel://720.333.LANS
> > Freedom is better when you earn it. Learn Linux.
> >
> >
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