[Xen-users] Coming across with a problem when using "xm create"---help!!!!

[SamuelCheng <chenghui2050@xxxxxxxxx>]

I followed the book called "Professional Xen Virtualization" written by
William von Hagen,and published by Wiley Publishing,Inc.

Here are some configuration files:
#cat /xen/ubuntu/ubuntu.xen3.cfg

kernel = "/boot/vmlinuz-2.6.18-128.1.16.el5xen"
ramdisk = "/boot/initrd-2.6.18-128.1.16.el5xen-no-scsi.img"
memory = "512"
name = "Ubuntu804"
vif = ['']
dhcp = "dhcp"
disk = ['tap:aio:/home/samuel/VirtualMachines/ubuntu.8-04.img,xvdb,w']
root = "/dev/xvdb ro"

The initrd-2.6.18-128.1.16.el5xen-no-scsi.img is created using 
"mkinitrd --omit-scsi-modules --with=xennet --with=xenblk --preload=xenblk
initrd-2.6.18-128.1.16.el5xen-no-scsi.img 2.6.18-128.1.16.el5xen"

This is a prebuilt image which is downloaded in Jailtime.org.

After do some checks,I start creating.
xm create /xen/ubuntu/ubuntu.xen3.cfg -c
This starts happily at first,but it hangs at 
" * Running local boot scripts (/etc/rc.local)               [ OK ]"

According to some solutions I get from Google,"Try adding 'extra = 'xencons
= tty1'' or 'extra='console=hvc0 xencons=tty''"is recommended.
So I add this to the "ubuntu.xen3.cfg" and "etc/rc.local"(after mount the
img to /mnt/img).

However,it also stop there saying "etc/rc.local : 13 :extra : not found."

If I only add ""extra="console=xvc0 xencons=tty"  in ubuntu.xen3.cfg it
leads to hangning on " input: PC Speaker as /class/input/input0"

I'm so confused with this,what can I do?

 
Sometimes,I also get another error:

error:"kernel.maps_protect" is an unknown key.

and

"/dev/xvdb:12171/128256 files(1.0%non-contiguous),59907/256256 blocks fsck
died with exit status 3   [fail]
* The file system check corrected errors on the root partition but requested
that the system should be restart.
*The system will be restart in 5 seconds.
Restarting system "
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