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    <title>topic Re: What triggers resource pools in Availability: HA &amp; FT Discussions</title>
    <link>https://communities.vmware.com/t5/Availability-HA-FT-Discussions/What-Triggers-Share-Values-to-Take-Effect/m-p/1331244#M3339</link>
    <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;I've been searching on Frank Denneman's site, but I don't think the answer is there to this specific question.&amp;nbsp; His quality is second to none, but I don't think it addresses this.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;Example of the difference between a general and specific definition of when share values take affect.&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;1.&amp;nbsp; A &lt;EM&gt;General&lt;/EM&gt; explanation of when resource pool share values take effect:&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;&lt;SPAN style="font-size: 10pt;"&gt;"Share values take effect When demand exceeds available resources"&lt;/SPAN&gt;&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;[this is &lt;EM&gt;general&lt;/EM&gt; - no metric specified for what data counters are used to calculate "demand", no data counters specified to define how "available resources" are calculated.]&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;2.&amp;nbsp; A &lt;EM&gt;specific&lt;/EM&gt; explanation of when resource pool share values take affect:&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;"Resource pool share values used in conjunction with CPU take affect when the demand, measured in percent utilization, and measured according to the data counter with the exact title of&lt;/P&gt;&lt;UL&gt;&lt;LI&gt;&lt;STRONG&gt;"cpu.usage.average"&lt;/STRONG&gt;&lt;/LI&gt;&lt;LI&gt;reaches &lt;STRONG&gt;95%&lt;/STRONG&gt;&lt;/LI&gt;&lt;/UL&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;of the host CPU capacity measured according to the data counter&lt;STRONG&gt; cpu.capacity.total&lt;/STRONG&gt; &lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;&lt;SPAN style="font-size: 13.3333330154419px; line-height: 1.5em;"&gt;[ok so I made that counter name up] after subtracting the overhead required by the hypervisor."&lt;/SPAN&gt;&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;I know this isn't how the algorithm works but I am creating an example to try to explain the difference between a general statement of what triggers share values to take affect and a specific definition of the condition that triggers them, defined by specific data counters reaching specific numerical values.&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;Hopefully that explains the question more clearly&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
    <pubDate>Thu, 20 Nov 2014 23:00:37 GMT</pubDate>
    <dc:creator>TheVMinator</dc:creator>
    <dc:date>2014-11-20T23:00:37Z</dc:date>
    <item>
      <title>What Triggers Share Values to Take Effect?</title>
      <link>https://communities.vmware.com/t5/Availability-HA-FT-Discussions/What-Triggers-Share-Values-to-Take-Effect/m-p/1331239#M3334</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Resource pools take affect only during contention.&amp;nbsp; But what is "contention" - does that mean resource pools take affect when cPU utilization on the host is 100%? 90%?&amp;nbsp; When CPU ready time reaches a certain amount?&amp;nbsp; What metric is used to tell resource pools to kick in?&lt;/P&gt;&lt;P&gt;Is there a table somewhere that tells you exactly what triggers resource pools to take affect?&amp;nbsp; For example:&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;UL&gt;&lt;LI&gt;When CPU ready time reaches x, resource pools and share values will be enforced&lt;/LI&gt;&lt;LI&gt;When CPU % utilization on the host reaches x&lt;/LI&gt;&lt;/UL&gt;&lt;P&gt;&lt;/P&gt;&lt;UL&gt;&lt;LI&gt;When memory % utilization on the host reaches x&lt;/LI&gt;&lt;/UL&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Mon, 17 Nov 2014 12:43:27 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Availability-HA-FT-Discussions/What-Triggers-Share-Values-to-Take-Effect/m-p/1331239#M3334</guid>
      <dc:creator>TheVMinator</dc:creator>
      <dc:date>2014-11-17T12:43:27Z</dc:date>
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    <item>
      <title>Re: What triggers resource pools</title>
      <link>https://communities.vmware.com/t5/Availability-HA-FT-Discussions/What-Triggers-Share-Values-to-Take-Effect/m-p/1331240#M3335</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;(All of this information, and much more is available in Duncan Epping and Frank Denneman's awesome vSphere Clustering Deep Dive book)&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Resource pools don't only take effect during contention. If a resource pool or VM is configured with a limit the available resources may be used up before the host or clusters resources are consumed. Using a limit can be a good way to play around with resource contention without overloading a host.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Contention will occur when resource demand exceeds available resources. This would be when CPU active and Memory active exceed available CPU and/or memory on the host (this would be less than 100% as the host requires certain resources to operate). The reservation and share resource allocation settings (on either the VM or the resource pool it is a part of) affect entitlement.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Does this answer your question?&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Mon, 17 Nov 2014 23:10:47 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Availability-HA-FT-Discussions/What-Triggers-Share-Values-to-Take-Effect/m-p/1331240#M3335</guid>
      <dc:creator>vbrowncoat</dc:creator>
      <dc:date>2014-11-17T23:10:47Z</dc:date>
    </item>
    <item>
      <title>Re: What triggers resource pools</title>
      <link>https://communities.vmware.com/t5/Availability-HA-FT-Discussions/What-Triggers-Share-Values-to-Take-Effect/m-p/1331241#M3336</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Thank you for your reply.&amp;nbsp; I pretty much am aware of&amp;nbsp; the basic principles of how resource pools operate.&amp;nbsp; I understand that share values in resource pools take affect when demand exceeds available resources.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;However, all of the explanations I can find are general in nature, and not specific.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;That is what I am trying to clarify.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Example:&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;1.&amp;nbsp; A &lt;EM&gt;General&lt;/EM&gt; explanation of when resource pool share values take effect.&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-size: 10pt; line-height: 1.5em;"&gt;"When demand exceeds available resources"&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;[this is &lt;EM&gt;general&lt;/EM&gt; - no metric specified for what data counters are used to calculate "demand", no data counters specified to define how "available resources" are calculated.]&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;2.&amp;nbsp; A &lt;EM&gt;specific&lt;/EM&gt; explanation of when resource pool share values take affect:&lt;/P&gt;&lt;P&gt;"Resource pool share values used in conjunction with CPU take affect when the demand, measured in percent utilization, and measured according to the data counter with the exact title of&lt;/P&gt;&lt;UL&gt;&lt;LI&gt;&lt;STRONG&gt;"cpu.usage.average"&lt;/STRONG&gt;&lt;/LI&gt;&lt;LI&gt;reaches &lt;STRONG&gt;95%&lt;/STRONG&gt;&lt;/LI&gt;&lt;/UL&gt;&lt;P&gt;of the host CPU capacity measured according to the data counter&lt;STRONG&gt; cpu.capacity.total&lt;/STRONG&gt; , [ok so I made that counter name up] after subtracting the overhead required by the hypervisor."&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;I know this isn't how the algorithm works but I am creating an example to try to explain the difference between a general statement of what triggers share values to take affect and a specific definition of the condition that triggers them, defined by specific data counters reaching specific numerical values.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Hopefully that explains the question more clearly&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Mon, 17 Nov 2014 23:31:21 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Availability-HA-FT-Discussions/What-Triggers-Share-Values-to-Take-Effect/m-p/1331241#M3336</guid>
      <dc:creator>TheVMinator</dc:creator>
      <dc:date>2014-11-17T23:31:21Z</dc:date>
    </item>
    <item>
      <title>Re: What triggers resource pools</title>
      <link>https://communities.vmware.com/t5/Availability-HA-FT-Discussions/What-Triggers-Share-Values-to-Take-Effect/m-p/1331242#M3337</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;It depends.... You can set things like reservations and limits on a resource pool and they always apply. Shares only apply when there is contention, just like with virtual machines. Frank wrote a billion great articles on what a resource pool is, how it works and how it should be used... I recommend starting there:&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;A href="https://www.google.nl/webhp?sourceid=chrome-instant&amp;amp;ion=1&amp;amp;espv=2&amp;amp;ie=UTF-8#q=frank%20denneman%20resource%20pools" title="https://www.google.nl/webhp?sourceid=chrome-instant&amp;amp;ion=1&amp;amp;espv=2&amp;amp;ie=UTF-8#q=frank%20denneman%20resource%20pools"&gt;Google&lt;/A&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Tue, 18 Nov 2014 15:38:42 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Availability-HA-FT-Discussions/What-Triggers-Share-Values-to-Take-Effect/m-p/1331242#M3337</guid>
      <dc:creator>depping</dc:creator>
      <dc:date>2014-11-18T15:38:42Z</dc:date>
    </item>
    <item>
      <title>Re: What triggers resource pools</title>
      <link>https://communities.vmware.com/t5/Availability-HA-FT-Discussions/What-Triggers-Share-Values-to-Take-Effect/m-p/1331243#M3338</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;OK thanks.&amp;nbsp; That helps me clarify my question - as "what triggers shares" is really the specific question, as opposed to limits or reservations.&amp;nbsp; In this case I am concerned only about shares, rather than limits and reservations.&amp;nbsp; With limits and reservations, it is very clear.&amp;nbsp; With shares, I haven't found the answer yet.&amp;nbsp; I have started googling his articles, but have not yet found the info as per my post above&amp;nbsp; - i.e. what is the exact metric and data counter value upon which shares take affect for CPU and RAM.&lt;/P&gt;&lt;P&gt;I changed the title of my post to "What Triggers Shares" to clarify.&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Wed, 19 Nov 2014 21:54:15 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Availability-HA-FT-Discussions/What-Triggers-Share-Values-to-Take-Effect/m-p/1331243#M3338</guid>
      <dc:creator>TheVMinator</dc:creator>
      <dc:date>2014-11-19T21:54:15Z</dc:date>
    </item>
    <item>
      <title>Re: What triggers resource pools</title>
      <link>https://communities.vmware.com/t5/Availability-HA-FT-Discussions/What-Triggers-Share-Values-to-Take-Effect/m-p/1331244#M3339</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;I've been searching on Frank Denneman's site, but I don't think the answer is there to this specific question.&amp;nbsp; His quality is second to none, but I don't think it addresses this.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;Example of the difference between a general and specific definition of when share values take affect.&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;1.&amp;nbsp; A &lt;EM&gt;General&lt;/EM&gt; explanation of when resource pool share values take effect:&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;&lt;SPAN style="font-size: 10pt;"&gt;"Share values take effect When demand exceeds available resources"&lt;/SPAN&gt;&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;[this is &lt;EM&gt;general&lt;/EM&gt; - no metric specified for what data counters are used to calculate "demand", no data counters specified to define how "available resources" are calculated.]&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;2.&amp;nbsp; A &lt;EM&gt;specific&lt;/EM&gt; explanation of when resource pool share values take affect:&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;"Resource pool share values used in conjunction with CPU take affect when the demand, measured in percent utilization, and measured according to the data counter with the exact title of&lt;/P&gt;&lt;UL&gt;&lt;LI&gt;&lt;STRONG&gt;"cpu.usage.average"&lt;/STRONG&gt;&lt;/LI&gt;&lt;LI&gt;reaches &lt;STRONG&gt;95%&lt;/STRONG&gt;&lt;/LI&gt;&lt;/UL&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;of the host CPU capacity measured according to the data counter&lt;STRONG&gt; cpu.capacity.total&lt;/STRONG&gt; &lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;&lt;SPAN style="font-size: 13.3333330154419px; line-height: 1.5em;"&gt;[ok so I made that counter name up] after subtracting the overhead required by the hypervisor."&lt;/SPAN&gt;&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;I know this isn't how the algorithm works but I am creating an example to try to explain the difference between a general statement of what triggers share values to take affect and a specific definition of the condition that triggers them, defined by specific data counters reaching specific numerical values.&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;&lt;/P&gt;&lt;P style="font-size: 13.3333330154419px;"&gt;Hopefully that explains the question more clearly&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Thu, 20 Nov 2014 23:00:37 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/Availability-HA-FT-Discussions/What-Triggers-Share-Values-to-Take-Effect/m-p/1331244#M3339</guid>
      <dc:creator>TheVMinator</dc:creator>
      <dc:date>2014-11-20T23:00:37Z</dc:date>
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