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    <title>topic Re: Multiple vCenter Clusters? in vCenter™ Server Discussions</title>
    <link>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322568#M9081</link>
    <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;If you don´t have any problems I don´t see a reason to split up the cluster.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;One main reason often are licensing facts. Oracle I think is the most common use case where spliting up the cluster make sense by fact saving much licensing costs.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Regards,&lt;/P&gt;&lt;P&gt;Mario&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
    <pubDate>Tue, 29 May 2012 19:39:45 GMT</pubDate>
    <dc:creator>vMario156</dc:creator>
    <dc:date>2012-05-29T19:39:45Z</dc:date>
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      <title>Multiple vCenter Clusters?</title>
      <link>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322561#M9074</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hi All&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;I'd like to throw a quick question out there.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;My company has 645 VMs spread over 13 ESXi 4.1 hosts (avg 49 VMs per host).&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;To improve performance they are suggesting I create 3 seperate Clusters and split the 13 ESXi Hosts among them. (i.e. 4 Hosts for Dev&amp;nbsp; / 4 hosts for Pre-Prod and 5 hosts for Production VMs). I don't think this is will have any performance benefit whatsoever, in fact as we dont have an equal number of dev, pre-prod and prod vms we could be in a situation of worse performance as more prod servers would be on fewer hosts than present.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;All Hosts are IBM servers (64 Logical CPUs, 400GB RAM) &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Personally I feel 1 Cluster is fine, and we simply need to add more Hosts to gain more CPU &amp;amp; RAM and have less VMs on Hosts -.i.e. less load.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;What do you guys think? Is there any benefit to having multiple Clusters? Any personal experience would be good to know.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;thanks&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Tue, 29 May 2012 19:06:31 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322561#M9074</guid>
      <dc:creator>ChallengeLogic7</dc:creator>
      <dc:date>2012-05-29T19:06:31Z</dc:date>
    </item>
    <item>
      <title>Re: Multiple vCenter Clusters?</title>
      <link>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322562#M9075</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Duncan wrote a nice article about cluster sizes with vSphere 5.0 (with a lot of interessting comments):&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;A class="jive-link-external-small" href="http://www.yellow-bricks.com/2012/04/10/cluster-sizes-vsphere-5-style/"&gt;http://www.yellow-bricks.com/2012/04/10/cluster-sizes-vsphere-5-style/&lt;/A&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;If you would create 3 clusters keep in mind that you need to provide 3 failover hosts minimum. In your 13 node cluster you are may fine with a 12 + 1 setup but with 3 cluster setup it must be three times n + 1.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Regards,&lt;/P&gt;&lt;P&gt;Mario&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Tue, 29 May 2012 19:12:34 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322562#M9075</guid>
      <dc:creator>vMario156</dc:creator>
      <dc:date>2012-05-29T19:12:34Z</dc:date>
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    <item>
      <title>Re: Multiple vCenter Clusters?</title>
      <link>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322563#M9076</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Mario - thanks, ah yes ! forgot about that. Our Cluster at present has 2 failover hosts. Will check out that link. &lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Tue, 29 May 2012 19:17:22 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322563#M9076</guid>
      <dc:creator>ChallengeLogic7</dc:creator>
      <dc:date>2012-05-29T19:17:22Z</dc:date>
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    <item>
      <title>Re: Multiple vCenter Clusters?</title>
      <link>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322564#M9077</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Are you seeing performance issues currently? A cluster of 13 hosts isn't all that large, and you can probably resolve any issues you're seeing by using things like Network I/O Control, Storage I/O Control, Resource Pools/Shares, etc instead of splitting up clusters.&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Tue, 29 May 2012 19:17:57 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322564#M9077</guid>
      <dc:creator>eeg3</dc:creator>
      <dc:date>2012-05-29T19:17:57Z</dc:date>
    </item>
    <item>
      <title>Re: Multiple vCenter Clusters?</title>
      <link>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322565#M9078</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Thanks for the reply. Currently in the performance view of our single Cluster I see this:-&lt;span class="lia-inline-image-display-wrapper" image-alt="cluster.jpg"&gt;&lt;img src="https://communities.vmware.com/t5/image/serverpage/image-id/37916i2129E5CA5C3A3390/image-size/large?v=v2&amp;amp;px=999" role="button" title="cluster.jpg" alt="cluster.jpg" /&gt;&lt;/span&gt;&lt;/P&gt;&lt;P&gt;I think the rationale behind multiple clusters is to get more out of our servers (so says the PM) - but I dont think this is right.&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Tue, 29 May 2012 19:30:31 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322565#M9078</guid>
      <dc:creator>ChallengeLogic7</dc:creator>
      <dc:date>2012-05-29T19:30:31Z</dc:date>
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    <item>
      <title>Re: Multiple vCenter Clusters?</title>
      <link>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322566#M9079</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Interesting. Would you be able to elaborate on their thoughts on how splitting up clusters gets more out of the systems? As vMario pointed out, it's the opposite.&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Tue, 29 May 2012 19:33:23 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322566#M9079</guid>
      <dc:creator>eeg3</dc:creator>
      <dc:date>2012-05-29T19:33:23Z</dc:date>
    </item>
    <item>
      <title>Re: Multiple vCenter Clusters?</title>
      <link>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322567#M9080</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;In answer to the question, No we arent really seeing too much in the way of performance related issues. The project wants to create some large VMs (large in CPU &amp;amp; RAM) and think this is the best way to manage those. I'd thought a single cluster would be better? Am I wrong?&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;I think all they will achieve is have 3 administrative 'islands'. This is typical PM / Business Owner thinking by the way.&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Tue, 29 May 2012 19:34:00 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322567#M9080</guid>
      <dc:creator>ChallengeLogic7</dc:creator>
      <dc:date>2012-05-29T19:34:00Z</dc:date>
    </item>
    <item>
      <title>Re: Multiple vCenter Clusters?</title>
      <link>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322568#M9081</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;If you don´t have any problems I don´t see a reason to split up the cluster.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;One main reason often are licensing facts. Oracle I think is the most common use case where spliting up the cluster make sense by fact saving much licensing costs.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Regards,&lt;/P&gt;&lt;P&gt;Mario&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Tue, 29 May 2012 19:39:45 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322568#M9081</guid>
      <dc:creator>vMario156</dc:creator>
      <dc:date>2012-05-29T19:39:45Z</dc:date>
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    <item>
      <title>Re: Multiple vCenter Clusters?</title>
      <link>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322569#M9082</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;I can understand their idea, but they are sacrificing resources (due to HA needs) in order to split it up. I would keep it one cluster unless there is a proven reason to do otherwise. Perhaps others will have different thoughts.&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Tue, 29 May 2012 19:40:53 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322569#M9082</guid>
      <dc:creator>eeg3</dc:creator>
      <dc:date>2012-05-29T19:40:53Z</dc:date>
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      <title>Re: Multiple vCenter Clusters?</title>
      <link>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322570#M9083</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;there are a number of reasons to split clusters the link to Duncans blog highlight them from a technical view point, if you are not using Blade technology then I would not bother spliting.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Another major reason is license compliance,&amp;nbsp; as the other poster says, this is usually for a Oracle Cluster.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;by spliting up your environment you will be reducing your overall resources as you will need to introduce more failover hosts,&amp;nbsp; currently you have two hosts assigned for failover purposes,&amp;nbsp; if you split into three seperate Clusters then there will be a requriement for an extra host to be assigned as a failover host.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;overall this seem a waste of resource.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;you say that your environment is looking at larger VM's&amp;nbsp; this is just a capacity planning exercise,&amp;nbsp; I would continue your arguement, as you are on the right lines.&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Tue, 29 May 2012 19:51:31 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322570#M9083</guid>
      <dc:creator>TomHowarth</dc:creator>
      <dc:date>2012-05-29T19:51:31Z</dc:date>
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      <title>Re: Multiple vCenter Clusters?</title>
      <link>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322571#M9084</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;egg3 &amp;amp; Tom - thank you very much for your input here. I appreciate it!&lt;/P&gt;&lt;P&gt;Our licensing is ok at the moment - I just think there is some skewed thinking in the business around this. They actually pinched one of my Hosts a while ago to use as a Citrix XenApp server - maybe I should ask for it back ! &lt;img id="smileyhappy" class="emoticon emoticon-smileyhappy" src="https://communities.vmware.com/i/smilies/16x16_smiley-happy.png" alt="Smiley Happy" title="Smiley Happy" /&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Tue, 29 May 2012 20:01:22 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322571#M9084</guid>
      <dc:creator>ChallengeLogic7</dc:creator>
      <dc:date>2012-05-29T20:01:22Z</dc:date>
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    <item>
      <title>Re: Multiple vCenter Clusters?</title>
      <link>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322572#M9085</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;I would most definately ask for it back and virtualise it &lt;img id="smileyhappy" class="emoticon emoticon-smileyhappy" src="https://communities.vmware.com/i/smilies/16x16_smiley-happy.png" alt="Smiley Happy" title="Smiley Happy" /&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Tue, 29 May 2012 20:05:58 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322572#M9085</guid>
      <dc:creator>TomHowarth</dc:creator>
      <dc:date>2012-05-29T20:05:58Z</dc:date>
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      <title>Re: Multiple vCenter Clusters?</title>
      <link>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322573#M9086</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Apart from other benefits highlighted above, you also need to take into account that more hosts will give DRS more flexibility to load balance the cluster.&lt;/P&gt;&lt;P&gt;In our 4.1 environment I feel 16 hosts cluster is an ideal number and have capped it to that.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;one additional discussion for your reading pleasure &lt;img id="smileyhappy" class="emoticon emoticon-smileyhappy" src="https://communities.vmware.com/i/smilies/16x16_smiley-happy.png" alt="Smiley Happy" title="Smiley Happy" /&gt;&lt;/P&gt;&lt;P&gt;&lt;A href="http://vpivot.com/2010/11/29/maximum-hosts-per-cluster/"&gt;http://vpivot.com/2010/11/29/maximum-hosts-per-cluster/&lt;/A&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Wed, 30 May 2012 04:46:13 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/vCenter-Server-Discussions/Multiple-vCenter-Clusters/m-p/322573#M9086</guid>
      <dc:creator>vGuy</dc:creator>
      <dc:date>2012-05-30T04:46:13Z</dc:date>
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