Guy Boisvert wrote:

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

<snip> First, have you tried booting with the second one, or do you require xen?

Second, I find it odd, since the kernel I have with 5.5 is 2.6.18-194.3.1.el5 (well, the initial install gave me 2.6.18-194.el5, but this was the first upgrade).

Finally, it's almost as though grub were not correctly installed - have you checked /boot/grub/device.map?

mark