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Old 07-12-2006, 12:51 PM   #1
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Registered: Jul 2006
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could not find filesystem /dev/root

This may be an FC5 specific question.

I have an AMD Quad opteron system that has all of its
partitions on RAID-1 (from sda and sdb SATA disks through
Si3114 + libata driver). All partitions are XFS, except for
the /boot, which is ext3 (FC5 refused to create an XFS boot
partition, which BTW works on many other systems i have
under FC3).

When booting in the latest 2.6.17 FC5 kernel, I get the
following message:

mount: could not find filestystem '/dev/root'.
Setting up other filesystems
Setting up new root fs
setuproot: moving /dev failed: No such file or directory
no fstab.sys mounting internal defaults
setuproot: error mounting /proc: No such file or directory
setuproot: error mounting /sys: No such file or directory
Switching to new root and running init
unmounting old /dev/
unmounting old /proc
unmounting old /sys
switchroot: mount failed: No such file or directory
Kernel panic - not syncing: Attempted to kill init

BTW, I get similar (but not identical) error when booting
in the older 2.6.15 kernel.

The / partition is on /dev/md1, and it has type of XFS. See
below the /etc/fstab. I have an initrd image that I believe
is OK (but maybe not). I tried booting with the default =
grub, but then I got frustrated, and moved to lilo (22.7,
also pretty intelligent about RAID, XFS, and all that
stuff). No difference -- so i may as well go back to grub.
The system boots in fine from the rescue CD followed by a
chroot /mnt/sysimage.

Here is /etc/fstab:

/dev/md1 / xfs defaults 1 1
/dev/md0 /boot ext3 defaults 1 2
devpts /dev/pts devpts gid=5,mode=620 0 0
tmpfs /dev/shm tmpfs defaults 0 0
/dev/md5 /home xfs defaults 1 2
/dev/md4 /myroot xfs defaults 1 2
proc /proc proc defaults 0 0
sysfs /sys sysfs defaults 0 0
/dev/md2 /usr/local xfs defaults 1 2
/dev/md3 /var xfs defaults 1 2
LABEL=SWAP-sdb3 swap swap defaults 0 0
LABEL=SWAP-sda3 swap swap defaults 0 0

( With the rescue CD the swap partitions also come up nice. )

Here is initrd:

|-- bin
| |-- insmod
| |-- modprobe
| -- nash
|-- dev
| -- mapper
|-- etc
|-- init
|-- lib
| |-- ext3.ko
| |-- jbd.ko
| |-- libata.ko
| |-- raid1.ko
| |-- sata_nv.ko
| |-- scsi_mod.ko
| |-- sd_mod.ko
| -- xfs.ko
|-- proc
|-- sbin
| |-- insmod
| |-- modprobe
| -- nash
|-- sys
-- sysroot

I made several attempts to re-create initrd myself after
the failures with default one. I thought maybe the SATA
drivers or XFS, or ext3 or whatever is missing.

For example:
mkinitrd -f -v --preload ext3 --preload xfs /boot/initrd-2.6.17.img 2.6.17

But it seems to me that all essential components are in the initrd/ .

HEre is lilo.conf:



And here is grub.conf:

title Fedora Core (2.6.17-1.2145_FC5smp)
root (hd0,0)
kernel /vmlinuz-2.6.17-1.2145_FC5smp ro root=/dev/md1 rhgb quiet
initrd /initrd-2.6.17-1.2145_FC5smp.img
title Fedora Core (2.6.17-1.2145_FC5)
root (hd0,0)
kernel /vmlinuz-2.6.17-1.2145_FC5 ro root=/dev/md1 rhgb quiet
initrd /initrd-2.6.17-1.2145_FC5.img

There must be a simple solution but i have a hard time finding it.
Old 07-12-2006, 08:31 PM   #2
LQ Newbie
Registered: Jul 2006
Posts: 2

Original Poster
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Problem solved. The trouble is that I don't _exactly_ know what changed.

I switched back to grub from lilo.
Then grub-install.
Then changed grub config and removed "quiet".

Then the UP kernel boots in.
The SMP still crashes, but that is a different issue.


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