topic superblock is corrupt -- help plz in Operating System - Linux

superblock is corrupt -- help plz

Maaz — Wed, 06 Oct 2004 13:04:43 GMT

Hello Dear Gurus,

os=rhl 9
/dev/hda1 vfat
/dev/hda2 ntfs
/dev/hda3 ext3 /
/dev/hda4
/dev/hda5 swap

grub is installed on MBR. every thing was alright, when i shutdown the system yesterday.

today when I boot the system, and following messages receives.

Setting hostname woodmas [ok]
Initiallizing USB keyboard [ok]
Initiallizing USB mouse [ok]
.
.
checking root filesystem
ABEL=/:
The superblock could not be read or doesnt describe a correct ext2 filesystem. If the device is

valid and it really contains an ext2 filesystem(and not swap or ufs or something else), then the

superblock is corrupt, and u might try running e2fsck with an alternate superblock:
e2fsck -b 8139
fsck.ext3: No such file or directory while trying to open ABEL=/ [failed]
*** An error occured during the file system check
*** Dropping you to a shell; the system will reboot
*** when you leave the shell
Give root password for maintenance
(or type Control-D to continue): #here I gave the root password

(Repair filesystem) 1#

After getting the prompt, i issued the following command

(Repair filesystem) 1# e2fsck -f /dev/hda3
e2fsck 1.32 (09-NOV-2002)
Pass 1: Checking inodes, block & sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking referrence counts
Pass 5: Checking group summary information
/: 101382/320640 files (0.1% non-contiguous), 459015/640591 blocks

then i type
(Repair filesystem) 2#init 3
INIT: Switching to runlevel: 3
INIT: Sending process the TERM signal
HANGUP
Checking for new hardware
Updating /etc/fstab unable to open /etc/fstab for writing: Read-only filesystem [failed]
touch: creating '/var/lock/subsys/kudzu: Read-only file system
Starting system logger # at this point system remains hang for about 5 min
.
.
.
.
.
INIT: Id "3" respawning too fast: disable for 5 minutes
INIT: Id "1" respawning too fast: disable for 5 minutes
INIT: Id "2" respawning too fast: disable for 5 minutes
INIT: Id "5" respawning too fast: disable for 5 minutes
INIT: Id "6" respawning too fast: disable for 5 minutes
INIT: Id "4" respawning too fast: disable for 5 minutes
INIT: no more process left in this run level

And nothing happens any more, i.e the system remains hang.

Any1 any help :(

Best Regards
Maaz

Re: superblock is corrupt -- help plz

Steven E. Protter — Wed, 06 Oct 2004 13:21:52 GMT

If fsck can't fix it you are in restore mode.

Try the real fsck command and then plan to put the sysem back together. Surely it has been backed up.

SEP

Re: superblock is corrupt -- help plz

Maaz — Wed, 06 Oct 2004 13:45:35 GMT

Dear SEP, i dont know abt the REAL fsck. could u plz le me know how to run REAL fsck, plz

Many Thanks
Regards
Maaz

Re: superblock is corrupt -- help plz

John Poff — Wed, 06 Oct 2004 15:54:52 GMT

Hi,

Did your root filesystem get converted from ext2 to ext3 somehow, and your /etc/fstab not get updated to reflect that change?

JP

Re: superblock is corrupt -- help plz

Ermin Borovac — Wed, 06 Oct 2004 23:07:50 GMT

The following line looks a bit suspicious (note ABEL instead of LABEL).

fsck.ext3: No such file or directory while trying to open ABEL=/ [failed]

You can try rebooting your system again and when it goes into recovery shell check /etc/fstab.

ABEL=/ / ext3 defaults 1 1

If you see the line as shown above do the following.

# mount -o rw,remount /
# vi /etc/fstab
Modify ABEL to LABEL and save the save
# exit

This should reboot the system and hopefully it will come clean.

Re: superblock is corrupt -- help plz

Maaz — Thu, 07 Oct 2004 00:03:00 GMT

Dear John poff, and Ermin Borovac, many thanks for the reply/help

John I'll check it, but there is no chance that root filesystem is changed from ext3 to ext2.

Ermin, your advice sounds very nice, and I think, that the point u mentioned, is the reall situation.

the system is in my office, and I'll follow the advices, when i'll be in my office.

Many Thanks
Regards
Maaz

Re: superblock is corrupt -- help plz

Johannes Krackowizer_1 — Thu, 07 Oct 2004 03:16:27 GMT

hi maaz,

the message:

checking root filesystem
ABEL=/:

might be a missing character in your /etc/fstab. there are two ways to select the correct device for a mount point:

LABEL=/ ext3 defaults 1 1

or yust type the device instead of LABEL...

/dev/hda3 ext3 defaults 1 1

if you type:
ABEL=/ ext3 defaults 1 1
the mount command trys to mount the device ABEL=/ as root filesystem. but there is no such device so you have to correct the spelling in your /etc/fstab.

johannes

Re: superblock is corrupt -- help plz

Johannes Krackowizer_1 — Thu, 07 Oct 2004 03:29:27 GMT

ps: it's very simple to convert a ext3 to an ext2 also if it is the rootfs. you only need a recovery cd.

boot from the cd.
use tune2fs -O ^has_journal
and sometimes you also need:
dumpe2fs /dev/hdax to see witch Filesystem Features are installed
tune2fs -O ^dir_index

after that you have to change in /etc/fstab
ext3 to ext2 and you can run the filesystem without journaling. But this is NOT recommended!!!

and as i wrote in the post before the type of your filesytem is not the problem. /etc/fstab is set incorrect. correct ABEL=/ to LABEL=/ or /dev/hda3 and it should work fine.

johannes

Re: superblock is corrupt -- help plz

Maaz — Thu, 07 Oct 2004 13:31:41 GMT

Many Thanks Ermin, u deserve 100++ points.
Yes Dear Ermin Borovac, as u mentioned, in /etc/fstab, there was written
ABEL=/ / ext3 defaults 1 1

instead of
LABEL=/ / ext3 defaults 1 1

Many Thanks SEP, and John.
Many Thanks Johannes Krackowizer .

Thanks Great Forum

Regards
Maaz