[Xen-users] Xen 4.0 - prerequisites for succesfull live migration?

[Danilo Godec <danilo.godec@xxxxxxxxx>]

Hi,

I have three Xen hosts running Xen 4.0.2 (OpenSuSE 11.4 based). I also 
have one 'NFS' server with an NFS export holding VM images and 
configuration files.
Each host has a dedicated LAN link directly to the NFS server. I have 
another separated NFS export for VM locking (but I had the same issues 
before).
When I attempt to live migrate a VM, it *looks'*like it's OK, but I end 
up with a non-responsive VM on the target host.
There are no fail or error lines in the source host xend.log file.

The xend.log file on the target host these 'fail' or 'error' lines:

[2011-07-06 14:57:11 26204] INFO (XendCheckpoint:485) read_exact_timed 
failed (select returned 0)
[2011-07-06 14:57:11 26204] INFO (XendCheckpoint:485) ERROR Internal 
error: Error when reading batch size
[2011-07-06 14:57:11 26204] INFO (XendCheckpoint:485) ERROR Internal 
error: error when buffering batch, finishing
I can also see that the VM lock file is changed and shows the VM is 
running on target host as if everything is OK.
Yet the VM is unresponsive - xm console, reboot or shutdown don't work - 
the only thing I can do is 'destroy' and re-create the VM.
My typical VM config looks like this:

name="ab1"
description="Apache Bench Server 1"
uuid="5383bef7-0794-4372-8c3d-e211e65e22d9"
memory=1024                    # It should start with 1G
maxmem=16384                # but we want to be able to add memory if needed
vcpu_avail=2                        # this VM should start with 2 VCPUs
vcpus=8                                # but 8 cores are available and 
we want to be able to add some if needed
cpus="1-8"                           # core 0 is 'reserved' for Domain 0
on_poweroff="destroy"
on_reboot="restart"
on_crash="destroy"
localtime=0
builder="linux"
bootloader="/usr/lib/xen/boot/domUloader.py"
bootargs="--entry=xvda1:/boot/vmlinuz-xen,/boot/initrd-xen"
extra=" 3 mem=4096m xencons=tty apparmor=0"
disk=[ 'tap:aio:/var/lib/xen/images/ab1/ab1.raw,xvda,w', ]
vif=[ 'mac=00:16:3E:02:00:43,bridge=br0' ]
vfb=['type=vnc,vncunused=1']


What am I missing? Anyone using a similar NFS approach and has live 
migration working OK?
  Danilo


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