Re: [Xen-users] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(8, 1)

[Jon Reynolds <jonr@xxxxxxxxxx>]

Sateesh Babu wrote:
> Hello,
>
> I have seen a similar post about the "Kernel panic - not syncing: VFS:
> Unable to mount root fs on unknown-block(8,1)" problem in the mailing
> list, but no one has posted the solution. So, asking it agian.
>
> I am facing problems in creating new virtual machine. I have installed
> Xen3.0 using apt-get on Ubuntu (dom0) and it starts up fine.
>
> Following is my vm config file:
> ------------
> name="vm01"
> kernel="/boot/vmlinuz-2.6.22-14-xen"
> root="/dev/sda1"
> memory=128
> disk=['file:/vserver/images/vm01.img,sda1,w']
>
> # network
> #vif=[ '' ]
> dhcp="off"
> ip="192.168.0.3"
> netmask="255.255.255.0"
> gateway="192.168.0.1"
> hostname="kavuri"
>
> extra="3"
> ------------
>
> When I try to start the virtual machine vm01, I get an error mount
> error as under:
>
> -------------
> [49158.057862] Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
> [49158.057972] io scheduler noop registered
> [49158.057976] io scheduler anticipatory registered
> [49158.057980] io scheduler deadline registered
> [49158.057994] io scheduler cfq registered (default)
> [49158.075321] Real Time Clock Driver v1.12ac
> [49158.075759] RAMDISK driver initialized: 16 RAM disks of 65536K size
> 1024 blocksize
> [49158.075918] input: Macintosh mouse button emulation as /class/input/input0
> [49158.075956] xencons_init: Initializing xen vfb; pass xencons=tty to
> prevent this
> [49158.076010] Xen virtual console successfully installed as xvc0
> [49158.076038] Event-channel device installed.
> [49158.085815] netfront: Initialising virtual ethernet driver.
> [49158.086075] PNP: No PS/2 controller found. Probing ports directly.
> [49158.086896] i8042.c: No controller found.
> [49158.086986] mice: PS/2 mouse device common for all mice
> [49158.087104] TCP cubic registered
> [49158.087125] NET: Registered protocol family 1
> [49158.087152] Using IPI No-Shortcut mode
> [49158.088922] xen-vbd: registered block device major 8
> [49158.088940] blkfront: sda1: barriers enabled
> [49158.184271] XENBUS: Device with no driver: device/console/0
> [49158.184771] List of all partitions:
> [49158.184779] 0801    1024000 sda1 driver: vbd
> [49158.184783] No filesystem could mount root, tried:  cramfs
> [49158.184790] Kernel panic - not syncing: VFS: Unable to mount root
> fs on unknown-block(8,1)
> ---------------
You need to create an initramfs or initrd file and add the filesystem to 
it. Then add a module stanza in your menu.lst file.
Hope this helps,

Jon


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