Re: [Xen-users] Is upgrade DomU can broke my XEN box ?

[Nico Kadel-Garcia <nkadel@xxxxxxxxx>]

linuxmasterjedi@xxxxxxx wrote:
> Hello,
>
>   I'm running for servers with RHEL 5.1 XEN on it. On each of them, I'm running
> 2 big Para-Virt RHEL 5.1 also.
>
>   I would like to know if someday, RedHat decide to upgrade the kernel and make
> a RHEL 5.2 for example. If I upgrade DomU to 5.2 with a new Xen Kernel, it will
> broke all my Para-Virt RHEL 5.1 machines ?
>   
RedHat publishes minor kernel and software upgrades on a frequent basis, 
as bugs and security issues get revealed. RedHat, like SuSE and other 
commercial vendors, guarantees cross-compatibility and support for 
particular release's software as long as you stay within that release. 
So othe kernel updates should be compatible with the Xen release at RedHat.
This can drive you nuts if you need to jump up a significant version to 
get necessary features. But staying within the RHEL 5.x published 
packages should work well.
>   If I do the opposite, keep RHEL 5.1 XEN on DomU and upgrade the Xen kernel
> inside a Para-Virt machine, is my machine will also broken ?
>   
See above. RedHat is selling Xen support, so they should be good about 
not breaking clients who have RHEL 5.x on the server and RHEL 5.x on the 
client, even as one is updated and not the other.

>   In clear, how are XEN "relationships" between guest & host ? Are they easily
> breakable? What are the common rules in that area?
>
>
>   thanks by advance,
>   
It Depends(tm). If you manually download the very latest Xen source 
tarball and lay it on top of the RHEL published RPM's, you're going to 
break things.
If you're using fully virtualized DomU's, they should be fairly immune 
from Dom0 changes, barring some major Xen upgrade that seriously changes 
the drivers expected by the DomU.
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