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

["[STD]Ein" <ein@xxxxxxxxxxxxxx>]

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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