server OS requirements for 2008 R2 clustering

What exactly are the server OS requirements for Server 2008 R2 clustering?

From my reading it seems that I can cluster either Server 2008 Enterprise or Data Centre but not Standard or Web.  Yet it seems that 2008 HyperV server  - the freeware product - can support clustering.

As well, if I do have to have Enterprise, which I believe allows for up to 4 guest sessions in the license, does that mean that I have to create 2008 Enterprise VM's?

Can 2008 Standard R2 not be clustered either physically or virtually in any way within a Microsoft only environment?



lineonecorpAsked:
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Glen KnightCommented:
>>Can 2008 Standard R2 not be clustered either physically or virtually in any way within a Microsoft only environment?

No, only Windows 2008 Enterprise or Datacentre can be clustered.

>>does that mean that I have to create 2008 Enterprise VM's?

This is correct as Standard does not support clustering.
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lineonecorpAuthor Commented:
Thanks for the clear answers.  How about my comment - ' Yet it seems that 2008 HyperV server  - the freeware product - can support clustering.'

Is that correct?  In other words I can get clustering with a freeware product but not with a paid product - 2008 Standard?

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Glen KnightCommented:
Your presumably talking about host clustering rather than guest clustering?

There is a difference.

For example you can have a cluster of Hyper-V servers
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lineonecorpAuthor Commented:
Yes, host clustering.  Host clustering as I understand is supported by HyperV Server 2008 R2 but not Server 2008 Standard? Is that correct?

As far as HyperV clustering goes e.g. clustering individual VMs , my understanding is that it can only be done if the VM is running 2008 Enterprise or some earlier OS e.g. Windows 2003 in which case it would be done by the clustering feature available to it - i.e. clustering a 2003 VM could only be done with 2003 clustering services. Correct?
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Glen KnightCommented:
Correct on both counts.
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