> The best proposal I've heard so far was to use MOSIX to do live job
> migration between machines, and then upgrade the kernel like normal.
> In the end, it is the jobs that are running on the kernel, and not
> the kernel or the individual machine that are the most important. One
> person pointed out that there is a single point of failure in the
> MOSIX "stub" machine, which doesn't help you in the end (how do you
> update the kernel there?). If you can figure a way to enhance MOSIX
> to allow migrating the MOSIX "stub" processes to another machine, you
> will have solved your problem in a much easier way, IMHO.
Virtual machines a la VM are also nice for this. Build a HA cluster from
two VMs, then upgrade one after another. All that's required is HA stuff
as it already is available.
Ralf
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