Hello,

Can any one please help me for this error.
Kernel Panic!!! -Not Syncing VFS:Unable to mount root FS on unknown - block
(0,0)
Please find the grub.conf. I am using RHEL-4. I rebuild the 2.6.9 kernel .I have applied KDB patch. Patch was applied succesfully and kernel compilation also well. But if I boot my machine with this kernel I am getting above error. Below are my details

[root@localhost linux-2.6.9-kdb]# fdisk -l
Disk /dev/sda: 40.0 GB, 40000000000 bytes
255 heads, 63 sectors/track, 4863 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 1 4 32098+ de Dell Utility
/dev/sda2 * 5 1309 10482412+ 7 HPFS/NTFS
/dev/sda3 1310 4862 28539472+ f W95 Ext'd (LBA)
/dev/sda5 1310 3982 21470841 7 HPFS/NTFS
/dev/sda6 3983 4862 7068568+ 7 HPFS/NTFS

Disk /dev/sdb: 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/sdb1 2 10200 81923467+ f W95 Ext'd (LBA)
/dev/sdb2 * 10201 10213 104422+ 83 Linux
/dev/sdb3 10214 10474 2096482+ 82 Linux swap
/dev/sdb4 10475 19457 72155947+ 83 Linux
/dev/sdb5 2 10200 81923436 7 HPFS/NTFS

#cat /boot/grub/grub.conf
# 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 (hd1,1)
# kernel /vmlinuz-version ro root=/dev/sdb4
# initrd /initrd-version.img
#boot=/dev/sda
default=3
timeout=5
splashimage=(hd1,1)/grub/splash.xpm.gz
hiddenmenu
title Red Hat Enterprise Linux WS (2.6.9)
root (hd1,4)
kernel /vmlinuz-latest new ro root=LABEL=/dev/sdb4 rhgb quiet
initrd /initrd-2.6.9.img
title Red Hat Enterprise Linux WS (2.6.9-5.ELsmp)
root (hd1,1)
kernel /vmlinuz-2.6.9-5.ELsmp ro root=LABEL=/ rhgb quiet
initrd /initrd-2.6.9-5.ELsmp.img
title Red Hat Enterprise Linux WS-up (2.6.9-5.EL)
root (hd1,1)
kernel /vmlinuz-2.6.9-5.EL ro root=LABEL=/ rhgb quiet
initrd /initrd-2.6.9-5.EL.img
title Windows
rootnoverify (hd0,1)
chainloader +1
I have copied bzImage and System.map into boot.
[root@localhost linux-2.6.9-kdb]# ll /boot/
total 23604
-rw-r--r-- 1 root root 48177 Jan 6 2005 config-2.6.9-5.EL
-rw-r--r-- 1 root root 47672 Jan 6 2005 config-2.6.9-5.ELsmp
drwxr-xr-x 2 root root 1024 Aug 13 14:31 grub
-rw-r--r-- 1 root root 489233 Aug 7 17:07 initrd-2.6.9-5.EL.img
-rw-r--r-- 1 root root 480812 Aug 7 17:07 initrd-2.6.9-5.ELsmp.img
-rw-r--r-- 1 root root 305107 Aug 9 11:43 initrd-2.6.9.img
-rw-r--r-- 1 root root 305113 Aug 8 16:04 initrd-2.6.9.img-kdb
drwx------ 2 root root 12288 Aug 7 22:33 lost+found
-rw-r--r-- 1 root root 23108 Dec 3 2004 message
-rw-r--r-- 1 root root 21282 Dec 3 2004 message.ja
lrwxrwxrwx 1 root root 16 Aug 9 11:43 System.map -> System.map-2.6.9
-rw-r--r-- 1 root root 987854 Aug 9 11:43 System.map-2.6.9
-rw-r--r-- 1 root root 712698 Jan 6 2005 System.map-2.6.9-5.EL
-rw-r--r-- 1 root root 741143 Jan 6 2005 System.map-2.6.9-5.ELsmp
-rw-r--r-- 1 root root 987854 Aug 13 11:53 System.map-latest
lrwxrwxrwx 1 root root 13 Aug 9 11:43 vmlinuz -> vmlinuz-2.6.9
-rw-r--r-- 1 root root 2007136 Aug 9 11:43 vmlinuz-2.6.9
-rw-r--r-- 1 root root 1433988 Jan 6 2005 vmlinuz-2.6.9-5.EL
-rw-r--r-- 1 root root 1400620 Jan 6 2005 vmlinuz-2.6.9-5.ELsmp

-rw-r--r-- 1 root root 2007136 Aug 13 11:53 vmlinuz-latest

FYI :
[root@localhost linux-2.6.9-kdb]# mkinitrd --preload=scsi_mod --preload=sd_mod --with=ata_piix \/boot/initrd-2.6.9.img-sata 2.6.9
No module ata_piix found for kernel 2.6.9, aborting.
I dont know whether SATA disk requres ata_piix or not.

Please let me know what could be the reason.

Thanks in advance,

cyber

I am not up on Redhat's "LABEL" system, but here is what I can see:

You have root(hd1,4) for one of your kernels, and root(hd1,1) for the others. If your kernels are all in the same /boot directory, then one of these is wrong. It looks like hdb2 is where /boot is, so they should all be root (hd1,1)

Similarly, you have root=LABEL=/ in some kernel lines, and root=LABEL=/dev/sdb4 for another.

Hello,
Thanks for your reply,

>>>root=LABEL=/ in some kernel lines, and root=LABEL=/dev/sdb4 for another

Previously it was root=LABEL=/ only . I made it into root=LABEL=/dev/sdb4

Thanks!