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Date: Thu, 12 Jul 2001 12:12:45 +0200
From: Ralf Baechle <ralf@uni-koblenz.de>
To: Andreas Dilger <adilger@turbolinux.com>
Cc: "C. Slater" <cslater@wcnet.org>, linux-kernel@vger.kernel.org
Subject: Re: Switching Kernels without Rebooting?
Message-ID: <20010712121245.C2502@bacchus.dhis.org>
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In-Reply-To: <200107112344.f6BNijh2010363@webber.adilger.int>; from adilger@turbolinux.com on Wed, Jul 11, 2001 at 05:44:45PM -0600
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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.

  Ralf
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