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[Xen-users] Xen + DRBD for live Migration

I am trying to configure LVM based Xen vm migration on ubuntu. But now DRBD is the only good solution i found.

can anyone help me to configure DRBD? what is Protocol D in DRBD? What is the need of Remus for DRBD?
I am following below links:

and same with xen4.1.4

I am getting below error:
root@mppdell-Inspiron-3521:/etc/drbd.d# drbdadm create-md drbd-vm
md_offset 26843541504
al_offset 26843508736
bm_offset 26842689536

Found ext3 filesystem
    26214400 kB data area apparently used
    26213564 kB left usable by current configuration

Device size would be truncated, which
would corrupt data and result in
'access beyond end of device' errors.
You need to either
   * use external meta data (recommended)
   * shrink that filesystem first
   * zero out the device (destroy the filesystem)
Operation refused.

Command 'drbdmeta 1 v08 /dev/vg00/lv01 internal create-md' terminated with exit code 40

one more thing i want to ask: what is the difference between DRBD and NFS for live migration? why LVM doen't support NFS?

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