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ESX:  CPU and vMotion compatibility

Posted on 2014-04-02
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Last Modified: 2014-04-09
Hi All,

We have to two HP DL385 G7 servers that I run ESX 5.1

I want to upgrade the CPU on one of them, but need to make sure vMotion etc.. is still works.

The server that I and not changing is as follows

Server details
What's the best CPU I can get that will still allow vMotion.


Many thanks
D
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Question by:detox1978
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RickEpnet earned 500 total points
ID: 39973524
Go here
http://www.vmware.com/resources/compatibility/search.php?deviceCategory=cpu
Click on CPU / EVC Matrix

In this Matrix scroll down to the AMD section and find the different CPU's you have and that will tell you is they are in the same Family. If they are not you can use an EVC cluster.
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Expert Comment

by:RickEpnet
ID: 39973532
To answer the second part of your question as long as you stick with ALL AMD or ALL Intel you can use EVC cluster to still use vMotion.

You can see more about that here.
http://www.vmware.com/files/pdf/vmotion_info_guide.pdf
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by:detox1978
ID: 39973562
Excellent link thank.

Looks like my CPU is only compatible with models from the same range

AMD Opteron 6200 Series
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LVL 120
ID: 39973640
You can change you CPU to anything, provided it's supported by motherboard, and there is an EVC Level for it!

You may find it more cost effective to purchase a newwer server.
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Author Closing Comment

by:detox1978
ID: 39976582
Thanks.

I'm going to get the same processor as I have to stick with the 6200 ranges, so might as well give myself spares.
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Author Comment

by:detox1978
ID: 39990082
Just a quick follow up question.

If I have a server with 2.2Ghz and another with 2.6Ghz.  What happens to the CPU clock speed when I use vMotion to switch between hosts?
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Expert Comment

by:RickEpnet
ID: 39990124
the vCPU that is on the VM you move will use the slower or faster CPU on the host it resides on. If you look at a VM through vSphere Client you only see vCPU no clock speed.
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LVL 120
ID: 39990287
The instructions will be masked (if different processor generations) but the VM will benefit from a faster clock speeds.
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