Question about vMotion unable to migrate due to the incompatibility of SSE4.1

Hi all

We bought another HP BL480c G1 and he joined our cluster, running ESX Server 3.5 U3. First of all and then I realized that our supplier has sent a version with a Xeon E5440. Other guests also BL480c G1, uses slightly older Xeon E5345, which is apparently a difference family produced minor.

This genereates following error message when you try to vMotion:

"Impossible to migrate from esx1 to esx4. Host CPU is incomatible to the requirements of the virtual machine to CPUID level 0 x 1 'ecx' register .... Inconsistency detected for these characteristics: * SSE4.1. see the article 1993 for a possible solution.

I tested a substitution of mask of vMotion (according to KB1993) on a test server and vMotion then works as expected. The substitution of masks is of course supported nor recommended because it can cause instability with vMotion.

Someone at - he found a solution support around this issue? Or has anyone ever encountered problems with the substitution?

I found nothing in the BIOS to disable SSE4.1.

Please post your solutions, workarounds and experiences.

Thank you

Björn Johansson

Hi Bjorn,

It's good to know that the E5345 comes with FlexMigration, Intel you need to update their documentation.

If I understand correctly FlexMotion is supported by VMware for 3.5 Update 2:

_______________________________________

Best compatibility - VMotion Simplifies VMotion compatibility through the generations of CPU issues. Improved compatibility VMotion (CVS) automatically configure the processors in the server with Intel FlexMigration or AMD - V extended Migration technologies to be compatible with the old servers. After that EVC is enabled for a cluster in the VirtualCenter inventory, all the hosts in this cluster are configured to ensure compatibility of the CPU for VMotion. VirtualCenter does not allow the addition of hosts that cannot be automatically configured to be compatible with those already in the EVC cluster.

REF: http://www.vmware.com/support/vi3/doc/vi3_esx35u2_vc25u2_rel_notes.html#whatsnew

_____________________________________________________

recommended is another story, I think VMware are constantly updating their software to include a wider range of supported hardware, but in an ideal world, we should try and keep the material the same to ensure 100% compatibility.

Ciaran

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