On Monday, Amazon wanted us to know that its staff worked day and night to avert planned reboots of cloud instances and updated a blog post to flag that information. But it didn’t provide any specifics on how these live updates were implemented.
Did [company]Amazon[/company] use live migration — a process in which the guest OS is moved to a new, safe host? Or did it use hot patching in which dynamic kernel updates are applied without screwing around with the underlying system?
Who knows? Because Amazon Web Services ain’t saying. Speculation is that it used live migration — even though AWS proponents last fall insisted that live migration per se would not have prevented the Xen-related reboots it launched at that time.
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