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    <title>topic Warning event in ESXi server in ESXi Discussions</title>
    <link>https://communities.vmware.com/t5/ESXi-Discussions/Warning-event-in-ESXi-server/m-p/417863#M30942</link>
    <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hi,&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;I have 4 ESXi 5.1 server which has iSCSI storage mounted to it. In recent times i see many warning events in all 4 servers as "&lt;STRONG&gt;Device naa.xxxxxxxxxxxxxxxxxx performance has deteriorated. I/O latency increased from average value of 1659 microseconds to 168642 microseconds&lt;/STRONG&gt;". These events occur on regular intervals for few minutes. I dont see any issues in my VM's during this time.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;I also get the below mentioned events.&lt;/P&gt;&lt;P&gt;&lt;STRONG&gt;"Path redundancy to storage device naa.&lt;/STRONG&gt;&lt;STRONG&gt;xxxxxxxxxxxxxxxxxx&lt;/STRONG&gt;&lt;STRONG&gt; (Datastores: VOL0) restored. Path vmhba37:C1:T0:L0 is active again".&lt;BR /&gt;"Lost path redundancy to storage device naa.&lt;/STRONG&gt;&lt;STRONG&gt;xxxxxxxxxxxxxxxxxx&lt;/STRONG&gt;&lt;STRONG&gt;. Path vmhba37:C1:T0:L0 is down. Affected datastores: VOL0".&lt;/STRONG&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;STRONG&gt;When i contacted my storage vendor he told it has to be checked on ESXi server side.&lt;/STRONG&gt;&lt;/P&gt;&lt;P&gt;&lt;BR /&gt;&lt;STRONG&gt;Can some one let me know what does these events mean?Thanks in advance...&lt;BR /&gt;&lt;/STRONG&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;STRONG&gt;&lt;BR /&gt;&lt;/STRONG&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
    <pubDate>Mon, 28 Jan 2013 13:48:02 GMT</pubDate>
    <dc:creator>sbala</dc:creator>
    <dc:date>2013-01-28T13:48:02Z</dc:date>
    <item>
      <title>Warning event in ESXi server</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/Warning-event-in-ESXi-server/m-p/417863#M30942</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hi,&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;I have 4 ESXi 5.1 server which has iSCSI storage mounted to it. In recent times i see many warning events in all 4 servers as "&lt;STRONG&gt;Device naa.xxxxxxxxxxxxxxxxxx performance has deteriorated. I/O latency increased from average value of 1659 microseconds to 168642 microseconds&lt;/STRONG&gt;". These events occur on regular intervals for few minutes. I dont see any issues in my VM's during this time.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;I also get the below mentioned events.&lt;/P&gt;&lt;P&gt;&lt;STRONG&gt;"Path redundancy to storage device naa.&lt;/STRONG&gt;&lt;STRONG&gt;xxxxxxxxxxxxxxxxxx&lt;/STRONG&gt;&lt;STRONG&gt; (Datastores: VOL0) restored. Path vmhba37:C1:T0:L0 is active again".&lt;BR /&gt;"Lost path redundancy to storage device naa.&lt;/STRONG&gt;&lt;STRONG&gt;xxxxxxxxxxxxxxxxxx&lt;/STRONG&gt;&lt;STRONG&gt;. Path vmhba37:C1:T0:L0 is down. Affected datastores: VOL0".&lt;/STRONG&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;STRONG&gt;When i contacted my storage vendor he told it has to be checked on ESXi server side.&lt;/STRONG&gt;&lt;/P&gt;&lt;P&gt;&lt;BR /&gt;&lt;STRONG&gt;Can some one let me know what does these events mean?Thanks in advance...&lt;BR /&gt;&lt;/STRONG&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;STRONG&gt;&lt;BR /&gt;&lt;/STRONG&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Mon, 28 Jan 2013 13:48:02 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/Warning-event-in-ESXi-server/m-p/417863#M30942</guid>
      <dc:creator>sbala</dc:creator>
      <dc:date>2013-01-28T13:48:02Z</dc:date>
    </item>
    <item>
      <title>Re: Warning event in ESXi server</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/Warning-event-in-ESXi-server/m-p/417864#M30943</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Well, I am afraid it is going to be a big chase now for you. You will know later &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;/P&gt;&lt;P&gt;Check this &lt;A href="http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&amp;amp;cmd=displayKC&amp;amp;externalId=2007236"&gt;kb &lt;/A&gt;from VMware&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Like you said, that the VMs are running fine, it is just the messages which VMware algorithm treats for calculation or finding out the time of max/min load. These can be ignored, if you find no issues in the VM performance.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Its the counters which VMware has gathered the performance data from the storage side, you could take a look at the storage counters to fix this issue &lt;A href="http://pubs.vmware.com/vsphere-50/index.jsp?topic=%2Fcom.vmware.wssdk.apiref.doc_50%2Fdisk_counters.html"&gt;here&lt;/A&gt;.&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Mon, 28 Jan 2013 14:21:33 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/Warning-event-in-ESXi-server/m-p/417864#M30943</guid>
      <dc:creator>zXi_Gamer</dc:creator>
      <dc:date>2013-01-28T14:21:33Z</dc:date>
    </item>
    <item>
      <title>Re: Warning event in ESXi server</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/Warning-event-in-ESXi-server/m-p/417865#M30944</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;The first one indicates that the response time of your storage system / datastores is much to high (which can be normal, if some of your VMs sending a lot of IO for example). There can be many reasons for this, eg.: The affected datastore is under contention / huge I/O load, you have some performance problems within your network (regarding you are using iSCSI) etc.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;The second message shows that a path to your storage system was totaly unreachable for a moment, which of course can be related to the first error.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Overall there can be many reasons for this problems. I would suggest you to start with checking the iSCSI network.&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>Mon, 28 Jan 2013 14:26:20 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/Warning-event-in-ESXi-server/m-p/417865#M30944</guid>
      <dc:creator>vMario156</dc:creator>
      <dc:date>2013-01-28T14:26:20Z</dc:date>
    </item>
    <item>
      <title>Re: Warning event in ESXi server</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/Warning-event-in-ESXi-server/m-p/417866#M30945</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Thanks for your reply guys... I went through the kb. I monitored my switch today and did not find any disconnection... I also contacted my storage vendor again and he has suggested to upgrade the firmware and am planning to do it this weekend.&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Tue, 29 Jan 2013 12:55:50 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/Warning-event-in-ESXi-server/m-p/417866#M30945</guid>
      <dc:creator>sbala</dc:creator>
      <dc:date>2013-01-29T12:55:50Z</dc:date>
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