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    <title>topic Re: Odd I/O and CPU performance on client in ESXi Discussions</title>
    <link>https://communities.vmware.com/t5/ESXi-Discussions/Odd-I-O-and-CPU-performance-on-client/m-p/2870912#M278387</link>
    <description>&lt;P&gt;Don't all reply at once .... &lt;img class="lia-deferred-image lia-image-emoji" src="https://communities.vmware.com/html/@3CBC42A1E7848F607FD419D398107BF9/emoticons/1f642.png" alt=":slightly_smiling_face:" title=":slightly_smiling_face:" /&gt;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;This is now sorted. After doing a bit of digging, it looks like the primary OS drive was thin provisioned, and had an outdated snapshot on it.&amp;nbsp;&lt;/P&gt;&lt;P&gt;Once the disk was inflated and the snapshot removed, the performance improved dramatically.&lt;/P&gt;</description>
    <pubDate>Fri, 08 Oct 2021 08:36:37 GMT</pubDate>
    <dc:creator>alexander_foti1</dc:creator>
    <dc:date>2021-10-08T08:36:37Z</dc:date>
    <item>
      <title>Odd I/O and CPU performance on client</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/Odd-I-O-and-CPU-performance-on-client/m-p/2870050#M278288</link>
      <description>&lt;P&gt;Hi all&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;I have been having odd performance issues on an ESX 6.0 host.&lt;/P&gt;&lt;P&gt;In particular with one VM.&amp;nbsp;&lt;/P&gt;&lt;P&gt;The host is a Dell R515 with PERC H700 raid controller. 12 6gb/s SAS 3.5" disks in a Raid 10 and 2 identical disks in a Raid 1&lt;/P&gt;&lt;P&gt;6 core Opteron 4180 CPU X 2 and 64GB of RAM&lt;/P&gt;&lt;P&gt;Each Raid has its own Datastore on it.&amp;nbsp;&lt;/P&gt;&lt;P&gt;The Virtual machine has one 18TB Thick provisioned Virtual disk (Raid 50 Dstore) and one 1 TB Thin provisioned virtual disk (Raid 1 Dstore).&lt;/P&gt;&lt;P&gt;The Raw IO performance testing on these disks is pretty good:&lt;/P&gt;&lt;P&gt;Raid 1&lt;/P&gt;&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Raid 1" style="width: 494px;"&gt;&lt;img src="https://communities.vmware.com/t5/image/serverpage/image-id/91344i8CD8DD95D0876C20/image-size/large/is-moderation-mode/true?v=v2&amp;amp;px=999" role="button" title="Raid1.JPG" alt="Raid 1" /&gt;&lt;span class="lia-inline-image-caption" onclick="event.preventDefault();"&gt;Raid 1&lt;/span&gt;&lt;/span&gt;&lt;/P&gt;&lt;P&gt;Raid 50&lt;/P&gt;&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="Raid 60" style="width: 495px;"&gt;&lt;img src="https://communities.vmware.com/t5/image/serverpage/image-id/91345iEFDDAF6B0AC99EDF/image-size/large/is-moderation-mode/true?v=v2&amp;amp;px=999" role="button" title="Raid10.JPG" alt="Raid 60" /&gt;&lt;span class="lia-inline-image-caption" onclick="event.preventDefault();"&gt;Raid 60&lt;/span&gt;&lt;/span&gt;&lt;/P&gt;&lt;P&gt;The issue comes when you put lots of IO on any of them. The VM performance slows to a crawl. (Server 2012 R2). Its system process takes up half the available CPU% and local ICMP Replies from another machine on the Lan increase from &amp;lt;1ms to 100-800ms:&lt;/P&gt;&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="icmp.JPG" style="width: 478px;"&gt;&lt;img src="https://communities.vmware.com/t5/image/serverpage/image-id/91349i5C2D7A0B79C74FB1/image-size/large/is-moderation-mode/true?v=v2&amp;amp;px=999" role="button" title="icmp.JPG" alt="icmp.JPG" /&gt;&lt;/span&gt;&lt;/P&gt;&lt;P&gt;I don't feel that the ESXTOP outputs for storage and CPU neccearily represent a problem, although I feel %VMwait is a tad high (although 16x VCPUS)&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="disk.JPG" style="width: 999px;"&gt;&lt;img src="https://communities.vmware.com/t5/image/serverpage/image-id/91350iBC3AFC2D0C3558E2/image-size/large/is-moderation-mode/true?v=v2&amp;amp;px=999" role="button" title="disk.JPG" alt="disk.JPG" /&gt;&lt;/span&gt;&lt;/P&gt;&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="cpu.JPG" style="width: 999px;"&gt;&lt;img src="https://communities.vmware.com/t5/image/serverpage/image-id/91351i74D6382512C0A0AD/image-size/large/is-moderation-mode/true?v=v2&amp;amp;px=999" role="button" title="cpu.JPG" alt="cpu.JPG" /&gt;&lt;/span&gt;&lt;/P&gt;&lt;P&gt;Here is a screenshot of Task manager when a backup is running (high io to both Datastores/Raid's)&lt;/P&gt;&lt;P&gt;&lt;span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="tskmgr.JPG" style="width: 495px;"&gt;&lt;img src="https://communities.vmware.com/t5/image/serverpage/image-id/91352i48AC64E90A738011/image-size/large/is-moderation-mode/true?v=v2&amp;amp;px=999" role="button" title="tskmgr.JPG" alt="tskmgr.JPG" /&gt;&lt;/span&gt;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;Any input would be much appreciated.&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;</description>
      <pubDate>Mon, 04 Oct 2021 13:51:34 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/Odd-I-O-and-CPU-performance-on-client/m-p/2870050#M278288</guid>
      <dc:creator>alexander_foti1</dc:creator>
      <dc:date>2021-10-04T13:51:34Z</dc:date>
    </item>
    <item>
      <title>Re: Odd I/O and CPU performance on client</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/Odd-I-O-and-CPU-performance-on-client/m-p/2870058#M278289</link>
      <description>&lt;P&gt;Further information, Additional tests and shown that only IO to the Raid 1 array causes the VM slowdown.....&lt;/P&gt;</description>
      <pubDate>Mon, 04 Oct 2021 14:17:22 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/Odd-I-O-and-CPU-performance-on-client/m-p/2870058#M278289</guid>
      <dc:creator>alexander_foti1</dc:creator>
      <dc:date>2021-10-04T14:17:22Z</dc:date>
    </item>
    <item>
      <title>Re: Odd I/O and CPU performance on client</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/Odd-I-O-and-CPU-performance-on-client/m-p/2870912#M278387</link>
      <description>&lt;P&gt;Don't all reply at once .... &lt;img class="lia-deferred-image lia-image-emoji" src="https://communities.vmware.com/html/@3CBC42A1E7848F607FD419D398107BF9/emoticons/1f642.png" alt=":slightly_smiling_face:" title=":slightly_smiling_face:" /&gt;&lt;/P&gt;&lt;P&gt;&amp;nbsp;&lt;/P&gt;&lt;P&gt;This is now sorted. After doing a bit of digging, it looks like the primary OS drive was thin provisioned, and had an outdated snapshot on it.&amp;nbsp;&lt;/P&gt;&lt;P&gt;Once the disk was inflated and the snapshot removed, the performance improved dramatically.&lt;/P&gt;</description>
      <pubDate>Fri, 08 Oct 2021 08:36:37 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/Odd-I-O-and-CPU-performance-on-client/m-p/2870912#M278387</guid>
      <dc:creator>alexander_foti1</dc:creator>
      <dc:date>2021-10-08T08:36:37Z</dc:date>
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