Anything Like Solaris' Live Ugrade?

[Tim Evans]

Does anyone know of any sort of Linux utility that does something like 
what Solaris' Live Upgrade 
(http://docs.oracle.com/cd/E19455-01/806-7933/index.html) does?

In my past life as a Solaris sys-admin, I found this an extremely useful 
tool for upgrading and patching running systems, as well as for 
maintaining redundant boot environments on separate system disks for 
disaster situations.
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