Re: reiserfsck 3.6.11 locks up

[Alex Malinovich <demonbane@the-love-shack.net>]

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On Sun, 2003-12-21 at 07:27, David Fendrich wrote:
> I have a disaster on my hands. I have important data on a HD which
> crashed a few days ago. It turns out that the back up system has been
> down for 1 month, so I really need to recover data from this HD. I used
> dd_recover to rescue what I could to a clean drive (very few blocks were
> damaged, fortunately).
> 
> I then mounted this 200 gig file with losetup and ran reiserfsck --check
> on it. Reiserfsck said that I needed to run with --rebuild-tree. So I
> did. Pass 0 went fine. Pass 1 locked up everything after 40%. I
> downloaded the latest reiserfsck (my first version was 3.6.6 or
> something like that) and tried again. Same result at the exakt same
> position.

I just did this exact thing finishing about half an hour ago. I had a
very badly corrupted RAID 0 array to try and get data from. Using
dd_rescue, each time a read failed the kernel would disconnect the drive
altogether, forcing me to reboot. Altogether I spent about 2 full days
doing nothing but running dd_rescue with various starting points. Here's
my full procedure:

1) run dd_rescue to get the data off the drive and dump it into a file
on another partition. In my case, the file was /backup/sda-rescue

2) Once I had a full backup, I made a copy of sda-rescue on another
drive just in case.

3) I ran the following: reiserfsck --rebuild-tree --logfile
/root/reiserfsck-rebuild-tree.log /backup/sda-rescue

4) This resulted in about 3000 files in lost+found and nothing else. The
original partition had about 130,000 files total. Luckily, I made a copy
of the backup at /other/sda-rescue. :)

5) I re-ran reiserfsck with the --scan-whole-partition option:
reiserfsck --rebuild-tree --scan-whole-partition --logfile
/root/reiserfsck-rebuild-tree.log /other/sda-rescue

6) Once this completed, I mounted the partition with the following
command and got a good chunk of my data back: mount -t reiserfs -o
loop,ro /other/sda-rescue /rescue

Unfortunately, I'm far from being an expert on reiserfs, this just
happened to work for me. Best of luck. :)

-- 
Alex Malinovich
Support Free Software, delete your Windows partition TODAY!
Encrypted mail preferred. You can get my public key from any of the
pgp.net keyservers. Key ID: A6D24837

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