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A look at Xen

A look at Xen

Posted Jun 30, 2005 14:32 UTC (Thu) by MarkWilliamson (subscriber, #30166)
In reply to: A look at Xen by patha
Parent article: A look at Xen

For details of live migration see:
http://www.cl.cam.ac.uk/netos/papers/2005-migration-nsdi-...

Other papers under:
http://www.cl.cam.ac.uk/Research/SRG/netos/xen/architectu...

If you run software that dirties large amounts of memory then the precopy
approach doesn't work very well: in this case, the live migration code
will figure it out and cuts its losses by doing "stop and copy" -
incurring a longer stoppage but more efficient use of network bandwidth.

For real world server workloads it works well: Running Quake 3 servers
incurred a downtime of about 60ms (I think), whilst an Apache webserver
running SpecWeb incurred a downtime of 300ms and didn't drop any clients.


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