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Re: Upgrading in the XEN world

On Fri, Dec 17, 2010 at 05:39:34PM +0100, Hauke Fath wrote:
> All,
> this may be an FAQ - still...
> I have this opteron machine here that runs netbsd-4 dom0 and domu, mainly
> for one-task servers like running the network's dhcpd, named slave, cups.
> It "just works", so I haven't looked at its setup thoroughly for quite a
> while. Now, the end of the year is a time just right for an upgrade, but -
> how, with minimal downtime and breakage?
> What about, and what are the implications of
> o upgrading dom0 to netbsd-5 while keeping the netbsd-4 domus for now?

this should work fine, as long as you stay to xen 3.1.4  not PAE

> o upgrading dom0 to netbsd-5 amd64, keeping the domus?

I assume your domUs are PV guests (not HVM). This won't work because you
would then need PAE kernels for the domUs, and this is not available in

> o upgrading dom0 to amd64, and the domus to i386?

This should be OK.

> o running upgraded domus on the netbsd-4 dom0?

this should be OK as well.

my recommended upgrade path would be:
- upgrade the domUs to netbsd-5, keeping i386 (not PAE) kernels.
- upgrade dom0 to amd64 or i386PAE, at the same time switch the domU
  kernels to i386PAE. This should have almost no impact on the
  domUs, only the kernel changes.

Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference

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