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BAD MAGIC NUMBER IN SUPER-BLOCK OS FC3

OS is FC3.
In my home user contained deleted data wich I want to restore.

After typing :  telinit -s

I type :           lvmdiskscan
/dev/hda       [149.05 GB]
/dev/hda1     [101.94 MB]
/dev/hda2     [148.95 GB]  LVM physical volume
1 disk
1 partition
0 LVM physical volume whole disks
1 LVM Physical volume

My home is on /dev/hda2

I type :        e2fsck -b 8193 /dev/hda2
or
                  fsck.ext3 -vc -b 8193 /dev/hda2

I have as result:       ...
                  Bad magic number in super-block while trying to open /dev/hda2
                  ...

How can I resolve this problem? Is anybody have a solution for me? it is very important for me.

Regards
0
blanom
Asked:
blanom
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1 Solution
 
joolsCommented:
you have an entry for /dev/hda and /dev/hda2 which looks a little strange.

I would have thought /dev/hda would have been the whole disk but the numbers don't add up (unless I'm misunderstanding something here!)

You shouldn't fsck the lvm partition, what do your lvm partitions get mounted as? A look at /etc/fstab may help here, also use vgdisplay!

Can you post back you fstab on this group?



My output is as follows;
# lvmdiskscan
  /dev/hde1 [      199.80 MB]
  /dev/hdg1 [      152.66 GB] LVM physical volume
  /dev/hde2 [        9.77 GB]
  /dev/hde3 [        1.00 GB]
  /dev/hde5 [       19.53 GB]
  /dev/hde6 [        4.88 GB]
  /dev/hdf1 [       13.98 GB]
  /dev/hdf2 [        1.44 GB]
  /dev/hdf3 [       22.74 GB]
  0 disks
  8 partitions
  0 LVM physical volume whole disks
  1 LVM physical volume

My fdisk output looks like this;
# fdisk -l

Disk /dev/hde: 40.0 GB, 40020664320 bytes
16 heads, 63 sectors/track, 77545 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hde1   *           1         406      204592+  83  Linux
/dev/hde2             407       20723    10239768   83  Linux
/dev/hde3           20724       22804     1048824   82  Linux swap / Solaris
/dev/hde4           22805       77545    27589464    f  W95 Ext'd (LBA)
/dev/hde5           22805       63439    20480008+  83  Linux
/dev/hde6           63440       73598     5120104+  83  Linux

Disk /dev/hdf: 40.9 GB, 40982151168 bytes
255 heads, 63 sectors/track, 4982 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hdf1   *           1        1825    14659281   83  Linux
/dev/hdf2            1826        2013     1510110   82  Linux swap / Solaris
/dev/hdf3            2014        4982    23848492+  83  Linux

Disk /dev/hdg: 163.9 GB, 163928604672 bytes
255 heads, 63 sectors/track, 19929 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hdg1   *           1       19929   160079661   8e  Linux LVM
#

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blanomAuthor Commented:
OS FC3
I let FC3 to do the partitions during  OS installation
You said device entries are little strange. I don't know I am a newbie

As follows my outputs

# lvmdiskscan
/dev/hda       [149.05 GB]
/dev/hda1     [101.94 MB]
/dev/hda2     [148.95 GB]  LVM physical volume
1 disk
1 partition
0 LVM physical volume whole disks
1 LVM Physical volume

#fdisk -l
Disk /dev/hda:160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device             Boot         Start             End                Blocks           Id               System
/dev/hda1       *              1                  13                  104391         83              Linux
/dev/hda2                       14                 19457       156183930         8e              Linux LVM

#cat /etc/fstab
#this file is edited by fstab-sync - see 'man fstab-sync' for details
/dev/VolGroup00/LogVol00           /                             ext3                 defaults                   1     1
LABEL=/boot                               /boot                       ext3                 defaults                   1     2
none                                          /dev/pts                   devpts              gid=5, mode=650    0     0
none                                          /dev/shm                 tmpfs               defaults                   0     0
none                                          /proc                       proc                 defaults                   0     0
none                                          /sys                         sysfs                defaults                   0     0
/dev/VolGroup00/LogVol01          swap                        swap                defaults                  0     0
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joolsCommented:
Errr.....right!

So lets go thru this bit by bit as I think I may have been a little confused....

You deleted some data and you are trying to get it back. To get it back you tried using telinit and fsck and you say your /home partition is on /dev/hda2 which is quite right but it's part of a logical volume.

I think there is a little confusion here, I've no idea why you used telinit but fsck is use to fix filesystems, not recover data. Check out the man pages for more information.

On the other hand, the error you got from fsck was indeed correct, there is no filesystem on /dev/hda.

Did you backup your data? I'm guessing not in which case you may have learned about the importance of backups the hard way, I think most of us have been there, done that!

As hard as it may be to understand, the likelyhood of you getting your lost file(s) back is low.....extreemely low or in fact...nil! If you're using just a basic system which I believe you are then the file(s) may well have gone for good.

If you removed the files by dragging them to the trash on the X desktop then you may be in luck (open the trash and see).

Let me know how you get on.

J
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blanomAuthor Commented:
Thanks Jools

What I have done exactly. On machine A under my /home/user/ I have some folders (our current jobs), on machine B My backup.

I used Nautilus to browse folders and make copie and paste.  My fault is I copied the backup and paste on the current job. I seen it too late when all folders are deleted.  I have seen in the trash but I have nothing.

I want to repair it recovery block but my knowing is  too small. I try to recover it with  Stellar Phoenix Linux but it is too long. It is the reason that my reply is late.

My backup is only 2 days late. I prefer restore the backup and forget hard recovery and last job.
Now I try to configure  rsync to make local host backup. rsync local local is working. Connection is refused when I try running rsync local host.
Maybe I need to configure firewall and open 873 port.

Thanks about help.
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joolsCommented:
OK, forget about repairing the filesystem, there is nothing wrong with it.

If you need to restore the files can you just use scp?

Perhaps something like the following could be used to copy a file called /home/user/backup.file from your machineB to the local system (machineA). You would obviously substitute the relevant parts to make it work in your setup.
     Login to machine A!

     # scp root@machineB:/home/user/backup.file /home/user/backup.file

If you want to use rsync you will need to make sure the services are working on both systems (that could be another question entirely), to get your file back quickly scp will do the job with less hassle.

J

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