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13.
04.
2007
Live wide-area migration of virtual machines in XenoServers
Dr. Evangelos Kotsovinos
Telekom Labs Berlin
The XenoServers group in Deutsche Telekom Laboratories is conducting
research and building software for managing global-scale virtual
server infrastructures. The first part of this talk will describe
the XenoServers project and outline some of the challenges
encountered and solutions devised.
The second part of this talk will focus on wide-area migration of
virtual machines. So far virtual machine (VM) migration has focused
on transferring the run-time memory state of the VMs in local-area
networks (LAN). However, for wide-area network (WAN) migration it
is crucial to not just transfer the VMs image but also transfer its
local persistent state (e.g. file system), and its on-going network
connections. In this paper we address both: by combining a
block-level solution with pre-copying and write throttling we show
that we can transfer an entire running web server (including its
local persistent state) with minimal disruption (three seconds in
the LAN and 68 seconds in the WAN); by combining dynDNS with
tunneling, existing connections can continue transparently while new
ones are redirected to the new network location. Thus we show
experimentally that by combining well-known techniques in a novel
manner we can provide system support for migrating virtual execution
environments in the wide area.
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