I am having a small confusion which I do not know how to get rid of.
I am using QEMU
I did
Code:
Every thing is working perfectly find as desired.I am able to install.
But
1) I want to use an LVM instead of hard disk image.
2) and want to export this QEMU installation to use on Xen.
This I am not clear with LVM part specially.
There is no LVM right now existing for QEMU I know how to create LVM's
but in this case how do I proceed.

I don't think Qemu itself needs to support LVM directly, once the guest supports it (in the kernel). Thus you use Qemu to create a raw disk image for your guest and then use your guest OS to create your Logical Volumes on this raw image. Qemu doesn't need to be directly involved in the LVM setup on the guest as far as I know. You don't use a raw hard disk image OR LVM; you use LVM as a layer *on top* of your raw disk image. And the LVM part of it is controlled by the guest OS, not Qemu. So you need to make sure your guest OS has the LVM userspace tools installed.

System Rescue CD has a nice guide to LVM - perhaps it will help.

http://www.sysresccd.org/Sysresccd-Guide-EN-LVM2

When bringing the VM up, simply specify an LV instead of a file as the disk attached

Okay.But while doing so I found that during installation if I am giving one of them as LVM then they are not accepting mount point as root.