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    <title>topic Re: differing server hardware - cluster compatiblity question in vSphere Upgrade &amp; Install Discussions</title>
    <link>https://communities.vmware.com/t5/vSphere-Upgrade-Install/differing-server-hardware-cluster-compatiblity-question/m-p/2176493#M25037</link>
    <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;To make cluster the server hardware should be same and compatible otherwise you will get the benefit of fail over cluster.&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
    <pubDate>Thu, 24 Jul 2014 17:31:00 GMT</pubDate>
    <dc:creator>King_Robert</dc:creator>
    <dc:date>2014-07-24T17:31:00Z</dc:date>
    <item>
      <title>differing server hardware - cluster compatiblity question</title>
      <link>https://communities.vmware.com/t5/vSphere-Upgrade-Install/differing-server-hardware-cluster-compatiblity-question/m-p/2176492#M25036</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;I have two older servers currently running ESXi 5.x in a cluster managed by vCenter.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;I have two newer servers that just became available.&amp;nbsp; They are different hardware, but can they be brought into the same cluster?&amp;nbsp;&amp;nbsp; I think the answer is no.&amp;nbsp;&amp;nbsp; Is there any workarounds?&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Thnx&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 24 Jul 2014 17:07:51 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vSphere-Upgrade-Install/differing-server-hardware-cluster-compatiblity-question/m-p/2176492#M25036</guid>
      <dc:creator>meddle2010</dc:creator>
      <dc:date>2014-07-24T17:07:51Z</dc:date>
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    <item>
      <title>Re: differing server hardware - cluster compatiblity question</title>
      <link>https://communities.vmware.com/t5/vSphere-Upgrade-Install/differing-server-hardware-cluster-compatiblity-question/m-p/2176493#M25037</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;To make cluster the server hardware should be same and compatible otherwise you will get the benefit of fail over cluster.&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 24 Jul 2014 17:31:00 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vSphere-Upgrade-Install/differing-server-hardware-cluster-compatiblity-question/m-p/2176493#M25037</guid>
      <dc:creator>King_Robert</dc:creator>
      <dc:date>2014-07-24T17:31:00Z</dc:date>
    </item>
    <item>
      <title>Re: differing server hardware - cluster compatiblity question</title>
      <link>https://communities.vmware.com/t5/vSphere-Upgrade-Install/differing-server-hardware-cluster-compatiblity-question/m-p/2176494#M25038</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Theoretically yes but the new servers, aside from having to be on the VMware HCL, should have CPUs from the same manufacturer. This will allow vMotion (with EVC mode).&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 24 Jul 2014 17:41:13 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vSphere-Upgrade-Install/differing-server-hardware-cluster-compatiblity-question/m-p/2176494#M25038</guid>
      <dc:creator>VRBitman</dc:creator>
      <dc:date>2014-07-24T17:41:13Z</dc:date>
    </item>
    <item>
      <title>Re: differing server hardware - cluster compatiblity question</title>
      <link>https://communities.vmware.com/t5/vSphere-Upgrade-Install/differing-server-hardware-cluster-compatiblity-question/m-p/2176495#M25039</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;The most common uses for a cluster in VMware are to take advantage of HA and DRS. As a best practice we must try our best not to have hardware with different specifications in the same cluster.&amp;nbsp; If you add hosts with different specs into the same cluster you end up with an unbalanced cluster. When you have an unbalanced cluster the Admission Control Policy calculations will not be what you might expect.&amp;nbsp; When Admission Control is enabled the worse case scenario is taken into account.&amp;nbsp; Which means, that when the calculation is made for available slots, the largest host is essentially left out of the equation.&amp;nbsp; This is in the case of setting your host failures to a single host.&amp;nbsp; Due to this, the best way to make sure you have setup a good cluster is to deploy machines with the same amount of resources for both memory and CPU.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Hope this help..&lt;/P&gt;&lt;P&gt;~Nitesh &lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Fri, 25 Jul 2014 10:00:55 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vSphere-Upgrade-Install/differing-server-hardware-cluster-compatiblity-question/m-p/2176495#M25039</guid>
      <dc:creator>admin</dc:creator>
      <dc:date>2014-07-25T10:00:55Z</dc:date>
    </item>
    <item>
      <title>Re: differing server hardware - cluster compatiblity question</title>
      <link>https://communities.vmware.com/t5/vSphere-Upgrade-Install/differing-server-hardware-cluster-compatiblity-question/m-p/2176496#M25040</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Yes, I agree with Nitesh.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;You can add mixed version hosts into cluster but it is recommended to keep host inside the cluster on same version.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Some implication if you have mixed host cluster.&lt;/P&gt;&lt;P&gt;1. Say you have 5.5 host, you can easily create VM with VMDK size more than 2TB, but when DRS thinks it needs to be migrated to other host say 5.1, VM can not be migrated as host 5.1 supports VMDK size upto 2TB. Hence it is going to reduce the DRS opportunities to balance the memory &amp;amp; cpu load.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;2. 5.5 host can have VM with hardware version 10, same can not be managed on host with 5.1 version.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;3. In 5.5, HA can be made aware off VM-VM anti-affinity rule but on host 5.1 HA will not honor VM-VM anti-affinity rule. Same is the case with DRS with flash resources.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;4. Also, every release there will some improvements on various features.&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Fri, 25 Jul 2014 14:47:05 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vSphere-Upgrade-Install/differing-server-hardware-cluster-compatiblity-question/m-p/2176496#M25040</guid>
      <dc:creator>vThinkBeyondVM</dc:creator>
      <dc:date>2014-07-25T14:47:05Z</dc:date>
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