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[Xen-users] Reg:Error: VFS: Cannot open root device.

  • To: <xen-users@xxxxxxxxxxxxxxxxxxx>
  • From: <ramamurthy.suresh@xxxxxxxxx>
  • Date: Tue, 10 Jun 2008 19:41:13 +0530
  • Delivery-date: Tue, 10 Jun 2008 07:12:06 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>
  • Thread-index: AcjLA9dd2qc/P1fsTReX0aBT3w357w==
  • Thread-topic: Reg:Error: VFS: Cannot open root device.

Hi all,

 

I’m trying to bring up a guest OS on Linux with Xen. I have booted the PC with Dom 0 in the partition /dev/hdc2 (Size 10 GB).  

 

I have created a separate partition /dev/hdc3 (size 10 GB) and replicated the Dom 0 directories in this partition and changed the /etc/fstab in /dev/hda3 (/mnt - have mounted this partition (/dev/hdc3) in /mnt ) as

 

/dev/sda1            /                       ext3    defaults       1 1    (sda1 -> because have specified this in the guest os configuration file)

 

I have unmounted /dev/hdc3 (/mnt) before booting the guest OS. ( ! )

 

The Guest OS configuration file looks like

 

kernel = "/boot/vmlinuz-2.6.18-53.el5xen" – this image in same as Dom 0.

memory = 64

vif = [ '' ]

disk = [ 'phy:hdc3,sda1,w' ]

root = "/dev/sda1 ro"

extra = "4 debug"

 

When I ran this configuration file for booting guest OS using - xm create myvmconf vmid=1, I’m getting the following errors:

 

XENBUS: Device with no driver: device/vbd/257

XENBUS: Device with no driver: device/vif/0

md: Autodetecting RAID arrays.

md: autorun ...

md: ... autorun DONE.

VFS: Cannot open root device "sda1" or unknown-block(0,0)

Please append a correct "root=" boot option

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

 

The Xend log shows

 

[2008-06-10 19:22:17 xend 2404] INFO (image:136) buildDomain os=linux dom=95 vcpus=1

[2008-06-10 19:22:17 xend 2404] DEBUG (image:201) domid          = 95

[2008-06-10 19:22:17 xend 2404] DEBUG (image:202) memsize        = 64

[2008-06-10 19:22:17 xend 2404] DEBUG (image:203) image          = /boot/vmlinuz-2.6.18-53.el5xen

[2008-06-10 19:22:17 xend 2404] DEBUG (image:204) store_evtchn   = 1

[2008-06-10 19:22:17 xend 2404] DEBUG (image:205) console_evtchn = 2

[2008-06-10 19:22:17 xend 2404] DEBUG (image:206) cmdline        =  root=/dev/sda1 ro 4 debug

[2008-06-10 19:22:17 xend 2404] DEBUG (image:207) ramdisk        =

[2008-06-10 19:22:17 xend 2404] DEBUG (image:208) vcpus          = 1

[2008-06-10 19:22:17 xend 2404] DEBUG (image:209) features       =

[2008-06-10 19:22:17 xend 2404] DEBUG (DevController:110) DevController: writing {'virtual-device': '257', 'device-type': 'disk', 'protocol': 'x86_32-abi', 'backend-id': '0', 'state': '1', 'backend': '/local/domain/0/backend/vbd/95/257'} to /local/domain/95/device/vbd/257.

[2008-06-10 19:22:17 xend 2404] DEBUG (DevController:112) DevController: writing {'domain': 'VirtualMachine1', 'frontend': '/local/domain/95/device/vbd/257', 'dev': 'sda1', 'state': '1', 'params': 'hdc3', 'mode': 'w', 'online': '1', 'frontend-id': '95', 'type': 'phy'} to /local/domain/0/backend/vbd/95/257.

[2008-06-10 19:22:17 xend 2404] DEBUG (DevController:110) DevController: writing {'mac': '00:16:3e:5b:c1:84', 'handle': '0', 'protocol': 'x86_32-abi', 'backend-id': '0', 'state': '1', 'backend': '/local/domain/0/backend/vif/95/0'} to /local/domain/95/device/vif/0.

[2008-06-10 19:22:17 xend 2404] DEBUG (DevController:112) DevController: writing {'domain': 'VirtualMachine1', 'handle': '0', 'script': '/etc/xen/scripts/vif-bridge', 'state': '1', 'frontend': '/local/domain/95/device/vif/0', 'mac': '00:16:3e:5b:c1:84', 'online': '1', 'frontend-id': '95'} to /local/domain/0/backend/vif/95/0.

[2008-06-10 19:22:17 xend.XendDomainInfo 2404] DEBUG (XendDomainInfo:756) Storing VM details: {'shadow_memory': '0', 'uuid': '6cfaa5d1-5a71-09b4-a888-39912a79565f', 'on_reboot': 'restart', 'start_time': '1213105937.65', 'on_poweroff': 'destroy', 'name': 'VirtualMachine1', 'xend/restart_count': '0', 'vcpus': '1', 'vcpu_avail': '1', 'memory': '64', 'on_crash': 'destroy', 'image': "(linux (kernel /boot/vmlinuz-2.6.18-53.el5xen) (root '/dev/sda1 ro') (args '4 debug'))", 'maxmem': '64'}

[2008-06-10 19:22:17 xend.XendDomainInfo 2404] DEBUG (XendDomainInfo:791) Storing domain details: {'console/ring-ref': '100635', 'console/port': '2', 'name': 'VirtualMachine1', 'console/limit': '1048576', 'vm': '/vm/6cfaa5d1-5a71-09b4-a888-39912a79565f', 'domid': '95', 'cpu/0/availability': 'online', 'memory/target': '65536', 'store/ring-ref': '100636', 'store/port': '1'}

[2008-06-10 19:22:17 xend.XendDomainInfo 2404] DEBUG (XendDomainInfo:988) XendDomainInfo.handleShutdownWatch

[2008-06-10 19:22:17 xend 2404] DEBUG (DevController:143) Waiting for devices vif.

[2008-06-10 19:22:17 xend 2404] DEBUG (DevController:149) Waiting for 0.

[2008-06-10 19:22:17 xend 2404] DEBUG (DevController:476) hotplugStatusCallback /local/domain/0/backend/vif/95/0/hotplug-status.

[2008-06-10 19:22:19 xend 2404] DEBUG (DevController:476) hotplugStatusCallback /local/domain/0/backend/vif/95/0/hotplug-status.

[2008-06-10 19:22:19 xend 2404] DEBUG (DevController:490) hotplugStatusCallback 1.

[2008-06-10 19:22:19 xend 2404] DEBUG (DevController:143) Waiting for devices usb.

[2008-06-10 19:22:19 xend 2404] DEBUG (DevController:143) Waiting for devices vbd.

[2008-06-10 19:22:19 xend 2404] DEBUG (DevController:149) Waiting for 257.

[2008-06-10 19:22:19 xend 2404] DEBUG (DevController:476) hotplugStatusCallback /local/domain/0/backend/vbd/95/257/hotplug-status.

[2008-06-10 19:22:19 xend 2404] DEBUG (DevController:490) hotplugStatusCallback 1.

[2008-06-10 19:22:19 xend 2404] DEBUG (DevController:143) Waiting for devices irq.

[2008-06-10 19:22:19 xend 2404] DEBUG (DevController:143) Waiting for devices vkbd.

[2008-06-10 19:22:19 xend 2404] DEBUG (DevController:143) Waiting for devices vfb.

[2008-06-10 19:22:19 xend 2404] DEBUG (DevController:143) Waiting for devices pci.

[2008-06-10 19:22:19 xend 2404] DEBUG (DevController:143) Waiting for devices ioports.

[2008-06-10 19:22:19 xend 2404] DEBUG (DevController:143) Waiting for devices tap.

[2008-06-10 19:22:19 xend 2404] DEBUG (DevController:143) Waiting for devices vtpm.

[2008-06-10 19:22:19 xend 2404] INFO (XendDomain:370) Domain VirtualMachine1 (95) unpaused.

[2008-06-10 19:22:23 xend.XendDomainInfo 2404] WARNING (XendDomainInfo:923) Domain has crashed: name=VirtualMachine1 id=95.

/* There is no reason being displaced for crashing this daemon */

[2008-06-10 19:22:23 xend.XendDomainInfo 2404] DEBUG (XendDomainInfo:1557) XendDomainInfo.destroy: domid=95

[2008-06-10 19:22:23 xend.XendDomainInfo 2404] DEBUG (XendDomainInfo:1566) XendDomainInfo.destroyDomain(95)

[2008-06-10 19:22:24 xend 2404] DEBUG (DevController:476) hotplugStatusCallback /local/domain/0/backend/vbd/1/2049/hotplug-status.

 

Please help me getting through this. Any help is appreciated. Thanks in advance.

 

Thanks

-Suresh.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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