Yes, the docs say that. In fact, you
need to have exactly the same CPU, not just the same brand. For example,
you cannot even add a new server to an existing pool if the CPUs are not
identical. We recently added a dual Intel Xeon 5645 server to a pool that
contained servers with dual Intel Xeon 5520. The only way we could add it
to the pool was by using CPU leveling. We had to use xe to ask the existing
pool members what their CPU features were and then we used xe on the new node
to mask its CPU features down to the same level as the existing nodes in the
pool. Then we could add the new node without any problem. I don’t
think the CPU leveling tricks will work between Intel and AMD, though. I think
the trick only works within a given brand.
-----Original Message-----
From:
xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Andrew Wells
Sent: Wednesday,
November 16, 2011 9:03 PM
To: James Harper
Cc: Antonio Colin; Xen Users List
Subject: RE: [Xen-users] Xm live
migration between Intel and AMD
Don't the docs say you have to have the same cpu's to
do a pool, and therefore a migration?
On Nov 16, 2011 5:50 PM, "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
wrote:
>
> I need to do a live migration between two different hosts:
>
> 1: Intel(R) Core(TM)2 CPU
> 2: AMD Athlon(tm) Processor TF-20
>
I tested this once upon a time... I think the cpuid entry I used was:
cpuid = [ '0:eax=0x3,ebx=0x0,ecx=0x0,edx=0x0',
'1:eax=0x06b1,ecx=xxxxxxxxxxx0000xx00xxx0000000xx0,edx=xxx00000xxxxxxx0x
xxxxxxxx0xxxxxx',
'4:eax=0x3,ebx=0x0,ecx=0x0,edx=0x0',
'0x80000000:eax=0x3,ebx=0x0,ecx=0x0,edx=0x0']
I tested it with XP and it worked but Silverlight wouldn't install
because it needs the SIMD instructions and they are turned off because
Intel and AMD have different implementations.
James
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