Esxi4 and Esxi5 together

we have 6 esxi host ver4.1 in a clustor and thinking of adding another host with existing clustor.
is it possible to mix ver4.* and 5.* in a clustor?
i will appreciate if you can send me the link.
pdsmicroAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
Yes, it's possible to mix Host versions in a Cluster, BUT if you do make sure you DO NOT upgrade any virtual hardware from v4 or v7 in the virtual machine, otherwise these Virtual Machines will not be compatible with ESXi 4.1.

Checkout the
VMware Product Interoperability Matrixes

You will also need to upgrade your version of vCenter Server to at least the same version as ESXi, e.g. vCenter Server 5.0 for ESXi 5.0, or vCenter 5.1 for ESXi 5.1.

vCenter Server 5.1 and ESXi 4.0 and ESXi 5.1
vCenter Server 5.0 and ESXi 4.0 and ESXi 5.1
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pdsmicroAuthor Commented:
Once we upgrade the vcentre then we add the ver 5.0 license along with 4.1 ,am I correct?
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cpkuser1Commented:
that is correct, upgrade then update license.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You will need to check

1. you have a valid license for vCenter Server 5.0. (can be enter at installation, or entered afterwards)
2. valid licenses for ESXi 5.0 - can be assgined in vCenter.
3. current 4.x licenses will already be in the database.
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piyushranusriSystem Cloud SpecialistCommented:
hanccocka explain in the best way..
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pdsmicroAuthor Commented:
thank you
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