Recover fs

Recover fs

[Alberto (albertix.com)]

Hi,

This is my first question, sorry for my english.
I have a very serious problem. I've demage (suppose) data on XFS  RAID 0 
disk, I'll try explain steps:

before:
n.2 sata hard disk monted on raid0 with xfs fs

after:
n.2 sata hard disk monted on raid0 with reiser fs

Story:
Server is gentoo based OS with TYAN MB with n.4 SATA onboard can be 
configured in Raid0, raid1, raid0+1.
On another controller (PCI) was mounted another sata hd with OS. This hd 
was faulted, than I decide to mount 2 hd with raid1 configuration for 
better security.
I've decided to move all same size disk to unique controller (on MB). 
When i moved this hard disks I've confused old disks with new and I've 
created new raid array on them.
Old array was xfs fs and new one i've decided to make reiserfs. After 
creation of RAID, i've make "mkreiserfs /dev/md1", but not on each single hd
Now I have new array (reiserfs) on disks witch before has very important 
data. When I saw my error, I've unmount array. With fdisk I see my sdc1 
free space.
In this exact moment i've lounched command: "xfs_repair -n /dev/sdc1".

I'm desperade (aprox. crying) , on this disks was 3 years of work data 
(web, db, materials).
It's possibility to recover this data (nothing else was writing after on 
disk disks) ??? . Pls help me
If is possibilty, I promise to make 10 copies (for penitency).

Alberto.

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Re: Recover fs

[Emmanuel Florac]

Le Tue, 09 Oct 2007 11:43:22 +0200 vous écriviez:

> I'm desperade (aprox. crying) , on this disks was 3 years of work
> data (web, db, materials).
> It's possibility to recover this data (nothing else was writing
> after on disk disks) ??? . Pls help me
> If is possibilty, I promise to make 10 copies (for penitency).

Alberto, apparently nobody cares to reply because 1) there's
essentially nothing to do and 2) you deserved it. I'm sorry, but you
really deserved it. Not backing up important data is plain stupid, but
not backing up important data when moving it around is completely crazy.

Now there is only one thing you may still try, but you won't get back
everything, and it will be very long and very painful : scan the hard
drive one byte at a time, and look for something you know. If you're
looking for JPG files, look for JPG headers, or HTML headers, for
databases there's probably some sort of identifiable header too.
I  did it one for a 12 TB X>FS that went booom (2.6.17 bug) containing
only DV files. Here is the perl program I used. 

#!/usr/bin/perl


use strict;
use warnings;

my ( $file )  = @ARGV;
my $blocksize = 144000 ;

my $lookupstring = pack "H*", "1F0700" ;
my $regexp = qr/^(.*?)($lookupstring.*)$/s ;

open ( my $raid, "< $file" ) or die "impossible d'ouvrir $file \n" ;

{
        my $block ;
        my $offset = 0 ;
        my $nextblock = 0;
        my $testfile;

        my $outnumber = 0;
        seek $raid, $offset, 0 or die ;

        while ( my $readbytes = read $raid, $block, $blocksize ) {
                $offset += $readbytes ;
                if ( $block =~ m/$regexp/ ) {
                        print "trouvé, fichier $outnumber offset
$offset\n";

                        if ( $testfile ) {
                                print $testfile $1;
                                close $testfile or die "Peut pas
fermer, $! "; undef $testfile ;
                                $outnumber++;
                                open $testfile,
">/mnt/destination/out". sprintf ("%09d", $ outnumber) . ".dv" or die
"impossible d'écrire sur fichier $outnumber "; print $testfile $2 ;
                        } else {
                                print "OPEN\n";
                                open $testfile,
">/mnt/destination/out". sprintf ("%09d", $ outnumber) . ".dv" or die
"impossible d'écrire sur fichier $outnumber "; print $testfile $2 ;
                        }
                } else {
                        if ( $testfile ) {
                                print $testfile $block;
                        }
                }

                if ($offset > 14293651161088 ) {
                        print "fini....\n";
                        exit;
                }
        }

}

-- 
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Emmanuel Florac               www.intellique.com   
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