RE: [Xen-users] migrating between different hardware (xen-3.1.3)

[b52@xxxxxxxxx]

I already thought that, but hoped there is a way to tell the domU which
cpu flags to use. Well this will be the reason my company will not use xen
for domain management. You will never know what kind of CPUs you will buy
in future and sure you don't want to buy a complete new cluster because
you need one box more..

Btw. should the relocation daemon not at least check the CPU flags of the
remote server before migration?

And there is really no way to pin the domU to a set of CPU flags?

-- Holger

> This has been brought up a few times on the list.  The problem is the cpu
> features that the guest is using.  When you transfer a domain from the p4
> to
> the a64, it supports all the flags (being a generation or two newer) that
> the p4 does, however in reverse it is not the case.
>
> There was some ongoing work to create a filter for domain creation that
> would allow the 'lowest common denominator'.  However, it seems it's never
> made into the codetree.  It has been listed on the xen roadmap for a long
> time now.
>
> In short, this doesn't work now, and unless somebody completes the feature
> filter, it may not work for some time.
>
> You should be careful to ensure that all the hosts that you transfer to do
> in fact support all the cpu flags that the creating host does, otherwise
> you
> will run into seemingly random crashes, corruption, or hangs.
>
> For the moment, it is only recommendable to do domain transfer between
> identical (or same generation same lineup) cpus.
>
> -----Original Message-----
> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of b52@xxxxxxxxx
> Sent: February 23, 2008 4:13 AM
> To: Xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: [Xen-users] migrating between different hardware (xen-3.1.3)
>
> Hi,
>
> I setup a testbed todo some migration tests for work and got a problem..
>
> I used two P4 2.4GHz an AMD64 4200+ (SVM) and an Intel C2D 6320 1.86GHz. I
> had xen 3.1.3 with 2.6.18 and exactly the same versions on all systems
> (mirrored AoE) and one 32Bit domU
>
> Now if I created this domU on one of the P4s, I was able to migrate it
> between every host.
> If I created this domU on the AMD or Intel C2D, it was only possible to
> migrate between these both. The domU always crashed if I tried to migrate
> it to the P4s.
>
> You can find the xm info of all 4 PCs and one xm log of source(AMD) and
> one xm log of destination(P4) in close.
>
> Any help is appreciated and please CC me
> Cheers,
> Holger
>
>
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>



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