[Xen-users] Error Booting DomU over NFS

[dasari dakshina <dakshi80@xxxxxxxxx>]

Hello,
Am getting this error on trying to boot a guest domain
over NFS .

Are there any network settings that must be done ?

I dont see /dev/nfs present on my system too. 
Thanks,
Dakshina

This is the log :

Linux version 2.6.13-15f-xen (geeko@buildhost) (gcc
version 4.0.2 20050901 (prerelease) (SUSE Linux)) #1
SMP Wed Nov 16 14:01:46 UTC 2005
BIOS-provided physical RAM map:
 Xen: 0000000000000000 - 0000000004000000 (usable)
0MB HIGHMEM available.
72MB LOWMEM available.
ACPI in unprivileged domain disabled
IRQ lockup detection disabled
Built 1 zonelists
Kernel command line: 
ip=129.158.239.225:129.158.239.223:::suse-xen:eth0:off
root=/dev/nfs nfsroot=129.158.239.223:/dvdstore1 3
Initializing CPU#0
PID hash table entries: 512 (order: 9, 8192 bytes)
Xen reported: 1799.793 MHz processor.
Dentry cache hash table entries: 16384 (order: 4,
65536 bytes)
Inode-cache hash table entries: 8192 (order: 3, 32768
bytes)
Software IO TLB disabled
vmalloc area: c5000000-fb7fe000, maxmem 34000000
Memory: 59744k/73728k available (2360k kernel code,
5652k reserved, 828k data, 180k init, 0k highmem)
Checking if this processor honours the WP bit even in
supervisor mode... Ok.
Security Framework v1.0.0 initialized
SELinux:  Disabled at boot.
Mount-cache hash table entries: 512
CPU: L1 I Cache: 64K (64 bytes/line), D cache 64K (64
bytes/line)
CPU: L2 Cache: 512K (64 bytes/line)
Enabling fast FPU save and restore... done.
Enabling unmasked SIMD FPU exception support... done.
Checking 'hlt' instruction... disabled
Brought up 1 CPUs
NET: Registered protocol family 16
xenbus_probe_init
Brought up 1 CPUs
ACPI: Subsystem revision 20050408
ACPI: Interpreter disabled.
Linux Plug and Play Support v0.97 (c) Adam Belay
pnp: PnP ACPI: disabled
xen_mem: Initialising balloon driver.
PCI: Using ACPI for IRQ routing
PCI: If a device doesn't work, try "pci=routeirq".  If
it helps, post a report
PCI: System does not support PCI
PCI: System does not support PCI
TC classifier action (bugs to netdev@xxxxxxxxxxxxxxx
cc hadi@xxxxxxxxxx)
Grant table initialized
audit: initializing netlink socket (disabled)
audit(1153930103.626:1): initialized
Total HugeTLB memory allocated, 0
VFS: Disk quotas dquot_6.5.1
Dquot-cache hash table entries: 1024 (order 0, 4096
bytes)
Initializing Cryptographic API
vesafb: abort, cannot ioremap video memory 0x0 @ 0x0
vesafb: probe of vesafb.0 failed with error -5
PNP: No PS/2 controller found. Probing ports directly.
i8042.c: No controller found.
io scheduler noop registered
io scheduler anticipatory registered
io scheduler deadline registered
io scheduler cfq registered
RAMDISK driver initialized: 16 RAM disks of 64000K
size 1024 blocksize
loop: loaded (max 8 devices)
Xen virtual console successfully installed as tty1
Event-channel device installed.
Successfully initialized TPM backend driver.
xen_net: Initialising virtual ethernet driver.
xen_tpm_fr: Initialising the vTPM driver.
mice: PS/2 mouse device common for all mice
md: md driver 0.90.2 MAX_MD_DEVS=256, MD_SB_DISKS=27
md: bitmap version 3.38
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0,
4096 bytes)
TCP established hash table entries: 4096 (order: 3,
32768 bytes)
TCP bind hash table entries: 4096 (order: 3, 32768
bytes)
TCP: Hash tables configured (established 4096 bind
4096)
TCP reno registered
NET: Registered protocol family 1
NET: Registered protocol family 8
NET: Registered protocol family 20
md: Autodetecting RAID arrays.
md: autorun ...
md: ... autorun DONE.
VFS: Cannot open root device "nfs" or
unknown-block(0,255)
Please append a correct "root=" boot option
Kernel panic - not syncing: VFS: Unable to mount root
fs on unknown-block(0,255)


===============================
My configuration file :

# Kernel image file.
kernel = "/boot/vmlinuz-xen"

# Optional ramdisk.
#ramdisk = "/boot/initrd-xen"

# The domain build function. Default is 'linux'.
#builder='linux'

# Initial memory allocation (in megabytes) for the new
domain.
memory = 64

# A name for your domain. All domains must have
different names.
name = "suse-dom"

# Set the hostname.
hostname = "suse-xen"
ip = "129.158.239.225"

# Set root device.
root = "/dev/nfs"
nfs_server='129.158.239.223'
nfs_root="/dvdstore"

# Sets runlevel 3.
extra = "3"


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