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    <title>topic Adding more RAM to a 2008R2 vSphere VM server caused a general performance decrease in ESXi Discussions</title>
    <link>https://communities.vmware.com/t5/ESXi-Discussions/Adding-more-RAM-to-a-2008R2-vSphere-VM-server-caused-a-general/m-p/379457#M23188</link>
    <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P class="MsoNormal"&gt;Hi,&lt;/P&gt;&lt;P class="MsoNormal"&gt;I have a very unusual problem – has anyone seen this&lt;/P&gt;&lt;P class="MsoNormal"&gt;&lt;/P&gt;&lt;P class="MsoNormal"&gt;&lt;STRONG style="mso-bidi-font-weight: normal"&gt;&lt;EM style="mso-bidi-font-style: normal"&gt;Adding more RAM to a 2008R2 vSphere VM server caused a performance decrease&lt;/EM&gt;&lt;/STRONG&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;BR /&gt;&lt;STRONG style="mso-bidi-font-weight: normal"&gt;Environment&lt;/STRONG&gt;&lt;BR /&gt;In our case the servers were deployed from templates 2008R2 Ent templates&lt;/P&gt;&lt;P class="MsoNormal" style="MARGIN-LEFT: 36pt"&gt;Template 1 – 4CPU, 8GB RAM, 50GB OS Disk, single NIC&lt;/P&gt;&lt;P class="MsoNormal" style="MARGIN-LEFT: 36pt"&gt;Template 2 – 2CPU, 4GB RAM, 50GB OS disk, single NIC&lt;/P&gt;&lt;P class="MsoNormal" style="MARGIN-LEFT: 36pt"&gt;VM Hardware 7&lt;/P&gt;&lt;P class="MsoNormal"&gt;vSphere 5.0 U1&lt;/P&gt;&lt;P class="MsoNormal"&gt;The vSphere environment is not overlay stressed, there is free host CPU, RAM Network and SAN disk resources for the VMs to use&lt;/P&gt;&lt;P class="MsoNormal"&gt;In house .NET 3 tier application&lt;/P&gt;&lt;P class="MsoNormal"&gt;There is a presentation (test01 and 02), middleware and DB server&lt;/P&gt;&lt;P class="MsoNormal"&gt;The presentation servers&amp;nbsp; are querying a data base, via a middleware servers and returns a list (note: this application is running in 3 separate locations AWS, private vSphere and another vSphere public cloud)&lt;/P&gt;&lt;P class="MsoNormal"&gt;Both TEST servers use the same middleware and DB server&lt;/P&gt;&lt;P class="MsoNormal"&gt;Each application tier resides in a separate subnet&lt;/P&gt;&lt;P class="MsoNormal"&gt;Network latency is 1ms&lt;/P&gt;&lt;P class="MsoNormal"&gt;No firewall rules between application tiers&lt;/P&gt;&lt;P class="MsoNormal"&gt;Same DNS servers&lt;/P&gt;&lt;P class="MsoNormal"&gt;Same route tables&lt;/P&gt;&lt;P class="MsoNormal"&gt;Same trace routes to middleware servers&lt;/P&gt;&lt;P class="MsoNormal"&gt;&lt;/P&gt;&lt;P class="MsoNormal"&gt;&lt;BR /&gt;&lt;STRONG style="mso-bidi-font-weight: normal"&gt;Initial Tests&lt;/STRONG&gt;&lt;/P&gt;&lt;P class="MsoNormal"&gt;The slowdown is across a green field virtual Citrix farm (scripted install)&lt;/P&gt;&lt;P class="MsoNormal"&gt;To rule out multiple software, environment, and hardware changes within the CTX deployment process, we deployed 2 new servers&amp;nbsp; and only executed the very first change of several. Add more RAM&lt;/P&gt;&lt;P class="MsoNormal"&gt;&lt;/P&gt;&lt;P class="MsoNormal"&gt;TEST01 Deployed from Template1 @ 4 CPU, 8 GB RAM and, 50GB HDD&lt;/P&gt;&lt;P class="MsoNormal" style="MARGIN-LEFT: 36pt"&gt;Initial testing showed that the DB query returned results in 1 minute&lt;/P&gt;&lt;P class="MsoNormal"&gt;TEST02 Deployed from Template2 @ 2 CPU and 4 GB ram&lt;/P&gt;&lt;P class="MsoNormal" style="MARGIN-LEFT: 36pt"&gt;Initial test showed that the DB query returned results in 1 minute and 30 seconds&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P class="MsoNormal"&gt;&lt;BR /&gt;&lt;STRONG style="mso-bidi-font-weight: normal"&gt;Adding more RAM&lt;/STRONG&gt;&lt;BR /&gt;TEST01 was changed to 16GB RAM - DB query returned results in 1 minute and 10 seconds&lt;BR /&gt;TEST02 was first changed to 8GB of RAM - DB query returned results in 2 minute and 30 seconds&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;BR /&gt;&lt;STRONG style="mso-bidi-font-weight: normal"&gt;Resolution&lt;/STRONG&gt;&lt;/P&gt;&lt;P class="MsoNormal"&gt;We have come across this unusual way to resolve the problem (OPS guy overheard the discussion and mention it was experienced in the private vSphere environment, which the cloud team weren’t aware of)&lt;/P&gt;&lt;P class="MsoNormal" style="TEXT-INDENT: 36pt"&gt;Shut Down the Server&lt;/P&gt;&lt;P class="MsoNormal" style="TEXT-INDENT: 36pt"&gt;Change the Server from a multil vCPU server to a single vCPU server.&lt;/P&gt;&lt;P class="MsoNormal" style="TEXT-INDENT: 36pt"&gt;Boot and accept hardware changes&lt;/P&gt;&lt;P class="MsoNormal" style="TEXT-INDENT: 36pt"&gt;Shut down and change back to a multi CPU server&lt;/P&gt;&lt;P class="MsoNormal" style="TEXT-INDENT: 36pt"&gt;NOTE: RAM values are not changed&lt;/P&gt;&lt;P class="MsoNormal"&gt;&lt;/P&gt;&lt;P class="MsoNormal"&gt;&lt;/P&gt;&lt;P class="MsoNormal"&gt;&lt;STRONG style="mso-bidi-font-weight: normal"&gt;Actions and results&lt;/STRONG&gt;&lt;/P&gt;&lt;P class="MsoNormal"&gt;TEST01 server - was 4CPU, changed to 1CPU and then back to 4CPU, with reboots in between - Tested and DB query returned results in 1 minute, same as original results &lt;BR /&gt;TEST02 server - was 2CPU, changed to 1CPU and then to 2CPU, with reboots in between - Tested and DB query returned results in 1 minute and 30 seconds&amp;nbsp; same as original results&lt;/P&gt;&lt;P class="MsoNormal"&gt;&lt;/P&gt;&lt;P class="MsoNormal"&gt;&lt;/P&gt;&lt;P class="MsoNormal"&gt;Thanks&lt;/P&gt;&lt;P class="MsoNormal"&gt;Mike&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
    <pubDate>Fri, 05 Oct 2012 20:34:37 GMT</pubDate>
    <dc:creator>sayahdo</dc:creator>
    <dc:date>2012-10-05T20:34:37Z</dc:date>
    <item>
      <title>Adding more RAM to a 2008R2 vSphere VM server caused a general performance decrease</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/Adding-more-RAM-to-a-2008R2-vSphere-VM-server-caused-a-general/m-p/379457#M23188</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P class="MsoNormal"&gt;Hi,&lt;/P&gt;&lt;P class="MsoNormal"&gt;I have a very unusual problem – has anyone seen this&lt;/P&gt;&lt;P class="MsoNormal"&gt;&lt;/P&gt;&lt;P class="MsoNormal"&gt;&lt;STRONG style="mso-bidi-font-weight: normal"&gt;&lt;EM style="mso-bidi-font-style: normal"&gt;Adding more RAM to a 2008R2 vSphere VM server caused a performance decrease&lt;/EM&gt;&lt;/STRONG&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;BR /&gt;&lt;STRONG style="mso-bidi-font-weight: normal"&gt;Environment&lt;/STRONG&gt;&lt;BR /&gt;In our case the servers were deployed from templates 2008R2 Ent templates&lt;/P&gt;&lt;P class="MsoNormal" style="MARGIN-LEFT: 36pt"&gt;Template 1 – 4CPU, 8GB RAM, 50GB OS Disk, single NIC&lt;/P&gt;&lt;P class="MsoNormal" style="MARGIN-LEFT: 36pt"&gt;Template 2 – 2CPU, 4GB RAM, 50GB OS disk, single NIC&lt;/P&gt;&lt;P class="MsoNormal" style="MARGIN-LEFT: 36pt"&gt;VM Hardware 7&lt;/P&gt;&lt;P class="MsoNormal"&gt;vSphere 5.0 U1&lt;/P&gt;&lt;P class="MsoNormal"&gt;The vSphere environment is not overlay stressed, there is free host CPU, RAM Network and SAN disk resources for the VMs to use&lt;/P&gt;&lt;P class="MsoNormal"&gt;In house .NET 3 tier application&lt;/P&gt;&lt;P class="MsoNormal"&gt;There is a presentation (test01 and 02), middleware and DB server&lt;/P&gt;&lt;P class="MsoNormal"&gt;The presentation servers&amp;nbsp; are querying a data base, via a middleware servers and returns a list (note: this application is running in 3 separate locations AWS, private vSphere and another vSphere public cloud)&lt;/P&gt;&lt;P class="MsoNormal"&gt;Both TEST servers use the same middleware and DB server&lt;/P&gt;&lt;P class="MsoNormal"&gt;Each application tier resides in a separate subnet&lt;/P&gt;&lt;P class="MsoNormal"&gt;Network latency is 1ms&lt;/P&gt;&lt;P class="MsoNormal"&gt;No firewall rules between application tiers&lt;/P&gt;&lt;P class="MsoNormal"&gt;Same DNS servers&lt;/P&gt;&lt;P class="MsoNormal"&gt;Same route tables&lt;/P&gt;&lt;P class="MsoNormal"&gt;Same trace routes to middleware servers&lt;/P&gt;&lt;P class="MsoNormal"&gt;&lt;/P&gt;&lt;P class="MsoNormal"&gt;&lt;BR /&gt;&lt;STRONG style="mso-bidi-font-weight: normal"&gt;Initial Tests&lt;/STRONG&gt;&lt;/P&gt;&lt;P class="MsoNormal"&gt;The slowdown is across a green field virtual Citrix farm (scripted install)&lt;/P&gt;&lt;P class="MsoNormal"&gt;To rule out multiple software, environment, and hardware changes within the CTX deployment process, we deployed 2 new servers&amp;nbsp; and only executed the very first change of several. Add more RAM&lt;/P&gt;&lt;P class="MsoNormal"&gt;&lt;/P&gt;&lt;P class="MsoNormal"&gt;TEST01 Deployed from Template1 @ 4 CPU, 8 GB RAM and, 50GB HDD&lt;/P&gt;&lt;P class="MsoNormal" style="MARGIN-LEFT: 36pt"&gt;Initial testing showed that the DB query returned results in 1 minute&lt;/P&gt;&lt;P class="MsoNormal"&gt;TEST02 Deployed from Template2 @ 2 CPU and 4 GB ram&lt;/P&gt;&lt;P class="MsoNormal" style="MARGIN-LEFT: 36pt"&gt;Initial test showed that the DB query returned results in 1 minute and 30 seconds&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P class="MsoNormal"&gt;&lt;BR /&gt;&lt;STRONG style="mso-bidi-font-weight: normal"&gt;Adding more RAM&lt;/STRONG&gt;&lt;BR /&gt;TEST01 was changed to 16GB RAM - DB query returned results in 1 minute and 10 seconds&lt;BR /&gt;TEST02 was first changed to 8GB of RAM - DB query returned results in 2 minute and 30 seconds&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;BR /&gt;&lt;STRONG style="mso-bidi-font-weight: normal"&gt;Resolution&lt;/STRONG&gt;&lt;/P&gt;&lt;P class="MsoNormal"&gt;We have come across this unusual way to resolve the problem (OPS guy overheard the discussion and mention it was experienced in the private vSphere environment, which the cloud team weren’t aware of)&lt;/P&gt;&lt;P class="MsoNormal" style="TEXT-INDENT: 36pt"&gt;Shut Down the Server&lt;/P&gt;&lt;P class="MsoNormal" style="TEXT-INDENT: 36pt"&gt;Change the Server from a multil vCPU server to a single vCPU server.&lt;/P&gt;&lt;P class="MsoNormal" style="TEXT-INDENT: 36pt"&gt;Boot and accept hardware changes&lt;/P&gt;&lt;P class="MsoNormal" style="TEXT-INDENT: 36pt"&gt;Shut down and change back to a multi CPU server&lt;/P&gt;&lt;P class="MsoNormal" style="TEXT-INDENT: 36pt"&gt;NOTE: RAM values are not changed&lt;/P&gt;&lt;P class="MsoNormal"&gt;&lt;/P&gt;&lt;P class="MsoNormal"&gt;&lt;/P&gt;&lt;P class="MsoNormal"&gt;&lt;STRONG style="mso-bidi-font-weight: normal"&gt;Actions and results&lt;/STRONG&gt;&lt;/P&gt;&lt;P class="MsoNormal"&gt;TEST01 server - was 4CPU, changed to 1CPU and then back to 4CPU, with reboots in between - Tested and DB query returned results in 1 minute, same as original results &lt;BR /&gt;TEST02 server - was 2CPU, changed to 1CPU and then to 2CPU, with reboots in between - Tested and DB query returned results in 1 minute and 30 seconds&amp;nbsp; same as original results&lt;/P&gt;&lt;P class="MsoNormal"&gt;&lt;/P&gt;&lt;P class="MsoNormal"&gt;&lt;/P&gt;&lt;P class="MsoNormal"&gt;Thanks&lt;/P&gt;&lt;P class="MsoNormal"&gt;Mike&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Fri, 05 Oct 2012 20:34:37 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/Adding-more-RAM-to-a-2008R2-vSphere-VM-server-caused-a-general/m-p/379457#M23188</guid>
      <dc:creator>sayahdo</dc:creator>
      <dc:date>2012-10-05T20:34:37Z</dc:date>
    </item>
    <item>
      <title>Re: Adding more RAM to a 2008R2 vSphere VM server caused a general performance decrease</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/Adding-more-RAM-to-a-2008R2-vSphere-VM-server-caused-a-general/m-p/379458#M23189</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Interesting... but I wonder what would happen with a physical Windows box.&amp;nbsp; Perhaps Windows is having issues with the changing memory, and changing to/from single CPU to multi CPU causes Windows to rescan something?&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Fri, 05 Oct 2012 21:57:39 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/Adding-more-RAM-to-a-2008R2-vSphere-VM-server-caused-a-general/m-p/379458#M23189</guid>
      <dc:creator>AKostur</dc:creator>
      <dc:date>2012-10-05T21:57:39Z</dc:date>
    </item>
    <item>
      <title>Re: Adding more RAM to a 2008R2 vSphere VM server caused a general performance decrease</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/Adding-more-RAM-to-a-2008R2-vSphere-VM-server-caused-a-general/m-p/379459#M23190</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Based on those numbers, I wouldn't expect much of a difference, but try running the same tests with a &lt;STRONG&gt;single&lt;/STRONG&gt; vCPU.&amp;nbsp; Sometimes a single vCPU can actually be faster than multiple vCPU's due to the way ESX handles cpu scheduling.&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Sat, 06 Oct 2012 01:35:22 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/Adding-more-RAM-to-a-2008R2-vSphere-VM-server-caused-a-general/m-p/379459#M23190</guid>
      <dc:creator>dkraut</dc:creator>
      <dc:date>2012-10-06T01:35:22Z</dc:date>
    </item>
    <item>
      <title>Re: Adding more RAM to a 2008R2 vSphere VM server caused a general performance decrease</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/Adding-more-RAM-to-a-2008R2-vSphere-VM-server-caused-a-general/m-p/379460#M23191</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Interesting indeed... &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;While the query is running I would be checking ESXTOP on the ESXi host for CPU Ready values and also the memory stats page for balloon driver inflation or memory being swapped to disk for starters....&amp;nbsp;&amp;nbsp; I would also check the db server performance counters and compare the same query results from an existing server to see if the results are comparable or not.&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Sun, 07 Oct 2012 21:23:39 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/Adding-more-RAM-to-a-2008R2-vSphere-VM-server-caused-a-general/m-p/379460#M23191</guid>
      <dc:creator>Rob_Bohmann1</dc:creator>
      <dc:date>2012-10-07T21:23:39Z</dc:date>
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