> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of youhongyu
> Sent: 29 May 2007 17:35
> To: xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] xen kernel can't boot up! it say: VFS:
> Cannot open root device "sda4" or unknown-block(0,0)
>
>
> hi all,
>
> I am really need help!
> My case: fedora 3, hdc1 is /boot, hdc2 is swap, hdc3 is / .
> I download xen barball and follow the README in it to
> compile, but when I
> turn to boot xen-kernel, I got this:
> VFS: Cannot open root device "sda4" or unknown-block(0,0)
> Please append a correct "root=" boot option
Natural, if you don't have a "/dev/sda4" in the first place...
> or
> VFS: Cannot open root device "/dev/hdc3" or unknown-block(0,0)
> Please append a correct "root=" boot option
Most likely because you don't have a (correct) initrd file.
"mkinitrd /boot/<something> 2.6.18-xen" or something similar should work
here.
> or
> VFS: Cannot open root device "LABEL=/" or unknown-block(0,0)
> Please append a correct "root=" boot option
I'm sure "LABEL" can be made to work, but if you know which disk is your
root disk, it works just as well to give it "/dev/hdc3" or some such -
it really is just a way to link the device and to a "name".
> why? and i am also wonder why install program will give
> /dev/sda4 to my
> grub?
Because it's stupid??? What install program did you use?
> Following may be needed to spot my fault. Can anybody help
> me? I had stop at
> here for a few days!
> thanks very much.
Perhaps the next problem is that the install program built a initrd
based on you having a "scsi" type disk to boot from? Try using
"mkinitrd" manuallay as above.
--
Mats
>
> youhongyu
>
> --------------------------------------------------------------
>
> [root@localhost xen-install]# fdisk -l
>
> Disk /dev/hdc: 80.0 GB, 80026361856 bytes
> 255 heads, 63 sectors/track, 9729 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
>
> Device Boot Start End Blocks Id System
> /dev/hdc1 * 1 13 104391 83 Linux
> /dev/hdc2 14 144 1052257+ 82 Linux swap
> /dev/hdc3 145 9729 76991512+ 83 Linux
>
> --------------------------------------------------------------
>
> [root@localhost xen-install]# df -lh
> Filesystem Size Used Avail Use% Mounted on
> /dev/hdc3 73G 4.4G 65G 7% /
> /dev/hdc1 99M 29M 65M 31% /boot
> none 249M 0 249M 0% /dev/shm
>
> --------------------------------------------------------------
>
> [root@localhost xen-install]# cat /proc/partitions
> major minor #blocks name
>
> 22 0 78150744 hdc
> 22 1 104391 hdc1
> 22 2 1052257 hdc2
> 22 3 76991512 hdc3
>
> --------------------------------------------------------------
> [root@localhost xen-install]# cat /etc/fstab
> # This file is edited by fstab-sync - see 'man fstab-sync' for details
> #/dev/hdc3 / ext3
> defaults 1
> 1
> LABEL=/ / ext3
> defaults 1 1
> #/dev/hdc1 /boot ext3
> defaults 1 2
> LABEL=/boot /boot ext3
> defaults 1 2
> none /dev/pts devpts
> gid=5,mode=620 0 0
> none /dev/shm tmpfs
> defaults 0 0
> none /proc proc
> defaults 0 0
> none /sys sysfs
> defaults 0 0
> #/dev/hdc2 swap swap defaults 0 0
> LABEL=SWAP-hdc2 swap swap
> defaults 0 0
> /dev/hdd /media/cdrom auto
> pamconsole,ro,exec,noauto,managed 0 0
>
> --------------------------------------------------------------
>
> /boot/grub/grub.conf:
> default=0
> timeout=8
> splashimage=(hd0,0)/grub/splash.xpm.gz
> hiddenmenu
> title Fedora Core (2.6.9-1.667)
> root (hd0,0)
> kernel /vmlinuz-2.6.9-1.667 ro root=LABEL=/ rhgb quiet
> initrd /initrd-2.6.9-1.667.img
>
> title Xen 3.0 / XenLinux 2.6
> root (hd0,0)
> kernel /xen-3.gz dom0_mem=262144
> # module /vmlinuz-2.6-xen ro root=LABEL=/
> # module /vmlinuz-2.6-xen root=/dev/sda4 ro console=tty0
> module /vmlinuz-2.6-xen root=/dev/hdc3 ro console=tty0
> module /xen.new.img
> --------------------------------------------------------------
>
> --
> View this message in context:
> http://www.nabble.com/xen-kernel-can%27t-boot-up%21-it-say%3A-
> VFS%3A-Cannot-open-root-device-%22sda4%22-or-unknown-block%280
> %2C0%29-tf3835072.html#a10857713
> Sent from the Xen - User mailing list archive at Nabble.com.
>
>
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