Xen users - Nov 2008 - XEN live migration and Guest creation sometimes causes reset of server

Hi.  I was wondering if anyone on this list has had a problem with doing live
migrations or new Guest creations or clones causing a restart or reset of
server hardware.

I have experienced this issue a few times and there is nothing strange in
any xen logs or messages on the server, it is as if someone just hits the
reset button on the server itself.  

In the logs I noticed that when a live migration was occurring, when it came
time to allocate the memory, the server would restart itself.  
I have since lowered the ram allocation for each guest down to 512MB if they
were higher (some were at 1024MB) and have not experienced the same problem
with migrations or creations, though i have allocated the same amount of
memory as before during the process.
 
Has anyone else experienced anything similar? Can someone shed some light on
what may be going on here?  What more information should i look for to help
me solve the issue? 

some specifics of the set up:
Two newer servers (quad core, 6GB ram)
Centos 5.2
Xen3.0.3 
DRBD running across the eth1
LVM running on top of DRBD resources.  

Thanks.

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