Re: Switching Kernels without Rebooting?

Jesse Pollard
2001-07-12T12:23:55Z

Ralf Baechle <ralf@uni-koblenz.de>:
> On Wed, Jul 11, 2001 at 05:44:45PM -0600, Andreas Dilger wrote:
>
> > 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.

That isn't even the same problem.
First, processes do not survive the upgrade.
Second, the upgrade must still be compatable with the host OS.

-------------------------------------------------------------------------
Jesse I Pollard, II
Email: pollard@navo.hpc.mil

Any opinions expressed are solely my own.