Superblock Problem

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  Hi all,

After rebooting my CentOS 5.5 server, i have the following message:

==================================
Red Hat nash version 5.1.19.6 starting
EXT3-fs: unable to read superblock
mount: error mounting /dev/root on /sysroot as ext3: invalid argument
setuproot: moving /root failed: No such file or directory
setuproot: error mounting /proc: No such file or directory
setuproot: error mounting /sys: No such file or directory
switchroot: mount failed: no such file or directory
Kernel panic - not syncing: Attempted to kill init!


I booted the server (rescue mode) with CentOS 5.4 x64 i have used to 
initially install it.  It recognizes all the RAID1 partitions i have.

cat /mnt/sysimage/proc/mdstat
============================
md3 : active raid1 sdb2[1] sda2[0]
       2048192 blocks [2/2] [UU]

md1 : active raid1 sdb3[1] sda3[0]
       486134848 blocks [2/2] [UU]

md0 : active raid1 sdb1[0] sda1[1]
       200704 blocks [2/2] [UU]

unused devices: <none>


cat /mnt/sysimage/boot/grub/menu.lst
===================================
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/md1
#          initrd /initrd-version.img
#boot=/dev/md0
default=0
timeout=5
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title CentOS (2.6.18-164.10.1.el5xen)
         root (hd0,0)
         kernel /xen.gz-2.6.18-164.10.1.el5
         module /vmlinuz-2.6.18-164.10.1.el5xen ro root=/dev/md1 rhgb quiet
         module /initrd-2.6.18-164.10.1.el5xen.img
title CentOS (2.6.18-164.10.1.el5)
         root (hd0,0)
         kernel /vmlinuz-2.6.18-164.10.1.el5 ro root=/dev/md1 rhgb quiet
         initrd /initrd-2.6.18-164.10.1.el5.img
title CentOS (2.6.18-164.6.1.el5)
         root (hd0,0)
         kernel /vmlinuz-2.6.18-164.6.1.el5 ro root=/dev/md1 rhgb quiet
         initrd /initrd-2.6.18-164.6.1.el5.img
title CentOS (2.6.18-164.6.1.el5xen)
         root (hd0,0)
         kernel /xen.gz-2.6.18-164.6.1.el5
         module /vmlinuz-2.6.18-164.6.1.el5xen ro root=/dev/md1 rhgb quiet
         module /initrd-2.6.18-164.6.1.el5xen.img
title CentOS (2.6.18-164.el5xen)
         root (hd0,0)
         kernel /xen.gz-2.6.18-164.el5
         module /vmlinuz-2.6.18-164.el5xen ro root=/dev/md1 rhgb quiet
         module /initrd-2.6.18-164.el5xen.img
title CentOS-base (2.6.18-164.el5)
         root (hd0,0)
         kernel /vmlinuz-2.6.18-164.el5 ro root=/dev/md1 rhgb quiet
         initrd /initrd-2.6.18-164.el5.img



./getinfo.sh disk
==============
== BEGIN uname -rmi ==
2.6.18-164.el5 x86_64 x86_64
== END   uname -rmi ==

== BEGIN rpm -q centos-release ==
centos-release-5-5.el5.centos
== END   rpm -q centos-release ==

== BEGIN getenforce ==
Permissive
== END   getenforce ==

== BEGIN cat /etc/fstab ==
/dev/md1                /                       ext3    defaults,acl    1 1
/dev/md0                /boot                   ext3    defaults        1 2
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
/dev/md3                swap                    swap    defaults        0 0
== END   cat /etc/fstab ==

== BEGIN df -h ==
Filesystem            Size  Used Avail Use% Mounted on
/dev/md1              450G   72G  355G  17% /
/dev/md0              190M   45M  136M  25% /boot
== END   df -h ==

== BEGIN fdisk -l ==
Disk /dev/md0 doesn't contain a valid partition table
Disk /dev/md1 doesn't contain a valid partition table
Disk /dev/md3 doesn't contain a valid partition table

Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

    Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          25      200781   fd  Linux raid 
autodetect
/dev/sda2              26         280     2048287+  fd  Linux raid 
autodetect
/dev/sda3             281       60801   486134932+  fd  Linux raid 
autodetect

Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

    Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *           1          25      200781   fd  Linux raid 
autodetect
/dev/sdb2              26         280     2048287+  fd  Linux raid 
autodetect
/dev/sdb3             281       60801   486134932+  fd  Linux raid 
autodetect

Disk /dev/md0: 205 MB, 205520896 bytes
2 heads, 4 sectors/track, 50176 cylinders
Units = cylinders of 8 * 512 = 4096 bytes


Disk /dev/md1: 497.8 GB, 497802084352 bytes
2 heads, 4 sectors/track, 121533712 cylinders
Units = cylinders of 8 * 512 = 4096 bytes


Disk /dev/md3: 2097 MB, 2097348608 bytes
2 heads, 4 sectors/track, 512048 cylinders
Units = cylinders of 8 * 512 = 4096 bytes

== END   fdisk -l ==

== BEGIN blkid ==
/dev/md3: TYPE="swap"
/dev/md0: UUID="085a2fe2-a28b-4c82-aae8-d4711a73f824" TYPE="ext3"
/dev/md1: UUID="4e26e66d-b4f3-45e3-8307-e13358b13610" TYPE="ext3"
/dev/sdb3: UUID="4e26e66d-b4f3-45e3-8307-e13358b13610" TYPE="ext3"
/dev/sdb2: TYPE="swap"
/dev/sdb1: UUID="085a2fe2-a28b-4c82-aae8-d4711a73f824" TYPE="ext3"
/dev/sda3: UUID="4e26e66d-b4f3-45e3-8307-e13358b13610" TYPE="ext3"
/dev/sda2: TYPE="swap"
/dev/sda1: UUID="085a2fe2-a28b-4c82-aae8-d4711a73f824" TYPE="ext3"
== END   blkid ==


Tried to boot from different kernels, same result.  I searched Google 
and read something about superblock being "repeted" to many places on 
the filesystem but didn't tried anything because of bad explanations and 
fear of srewing up the partition.

I already backed up the important stuff to another server.  I'd like to 
know if it's possible to fix that problem quickly, if not i'll 
re-install it.  But i'd like to know the fix anyway so if it appends 
again, would know what to do!

Thanks!

Guy Boisvert
IngTegration inc.


-- 
Guy Boisvert, ing.
IngTegration inc.
http://www.ingtegration.com

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