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    <title>topic Re: RAW DEVICE MAPPINGs in ESXi Discussions</title>
    <link>https://communities.vmware.com/t5/ESXi-Discussions/RAW-DEVICE-MAPPINGs/m-p/1657118#M147119</link>
    <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hi Jlitnyc,&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-size: 12pt;"&gt;&lt;STRONG&gt;"I have a VM with an attached RDM that needs to be moved to a physical host.&lt;/STRONG&gt;&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-size: 12pt;"&gt;&lt;STRONG&gt; &lt;/STRONG&gt;&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-size: 12pt;"&gt;&lt;STRONG&gt;Has anyone tried this?"&lt;/STRONG&gt;&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;We tried this and it works but in order to acomplish this you have to follow few steps..&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;I assume it is windows VM..&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Take a complete backup of that specific Lun&lt;/P&gt;&lt;P&gt;Set the drive offline from windows disk management &lt;/P&gt;&lt;P&gt;Remove the lun from the vm...&lt;/P&gt;&lt;P&gt;From the SAN end ---Remove the lun number from the ESXi host so that they can't see the lun any more.&lt;/P&gt;&lt;P&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; Add the lun to physical machine &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Assuming the physical server iscsi initiator is already configured.You can configure the rest on the physical machine&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Thanks&lt;/P&gt;&lt;P&gt;SA&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
    <pubDate>Tue, 21 Aug 2012 09:25:00 GMT</pubDate>
    <dc:creator>sa2057</dc:creator>
    <dc:date>2012-08-21T09:25:00Z</dc:date>
    <item>
      <title>RAW DEVICE MAPPINGs</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/RAW-DEVICE-MAPPINGs/m-p/1657112#M147113</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'm looking for guidence and advice on RDMs and how to go about configuring them.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Basically, we have a number of VMs and these require connectivity to one or more LUNs. Are RDMs required? If so, how does one connected a VM to the RDM?&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Thanks&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Fri, 05 Nov 2010 13:47:38 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/RAW-DEVICE-MAPPINGs/m-p/1657112#M147113</guid>
      <dc:creator>joeflint</dc:creator>
      <dc:date>2010-11-05T13:47:38Z</dc:date>
    </item>
    <item>
      <title>Re: RAW DEVICE MAPPINGs</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/RAW-DEVICE-MAPPINGs/m-p/1657113#M147114</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hello.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;BLOCKQUOTE level="1"&gt;&lt;P&gt;Basically, we have a number of VMs and these require connectivity to one or more LUNs. Are RDMs required? &lt;/P&gt;&lt;/BLOCKQUOTE&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Yes, if you need direct LUN access then you can use RDMs to accomplish this.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;BLOCKQUOTE level="1"&gt;&lt;P&gt;If so, how does one connected a VM to the RDM?&lt;/P&gt;&lt;/BLOCKQUOTE&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Basically you create the LUN and present it to your host(s) the same way you would a VMFS volume.  Then you add it to a virtual machine, just like you would add a VMDK.  You just choose the RDM option instead.  The full information on RDMs and connecting to them can be found in the &lt;A href="http://www.vmware.com/pdf/vsphere4/r41/vsp_41_esx_server_config.pdf"&gt;ESX Configuration Guide&lt;/A&gt;.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Good Luck!&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Fri, 05 Nov 2010 13:54:45 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/RAW-DEVICE-MAPPINGs/m-p/1657113#M147114</guid>
      <dc:creator>vmroyale</dc:creator>
      <dc:date>2010-11-05T13:54:45Z</dc:date>
    </item>
    <item>
      <title>Re: RAW DEVICE MAPPINGs</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/RAW-DEVICE-MAPPINGs/m-p/1657114#M147115</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Basically an RDM is a formatted LUN volume (windows, linux etc..) that already exists.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;If you want to move that LUN away from a physical server and apply it to say a virtual machine while preserving the data on that LUN, then that's when a RDM comes into play.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt; &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;You will need to apply the appropriate zoning or mapping on your SAN so that the physical VMware host can access the LUN (essentially removing its acces from a physical server and moving it to the vmHOST).  The same way you present a lun to your vmHOSTs on your SAN.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;From there you can add the disk to any VM as you would add a new disk to a VM in its properties, the difference is you select the RDM option instead.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;This works great, remember you have a 2TB size limit on RDM's ( I think its 2TB 'officially')&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Save yourself some headache and make sure the datastore where the VM lives has a block size large enough to support the RDM you are attaching.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;This will be important for cloning and snapshot purposes.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;That's all there is to it.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;I recently moved a 1.5TB LUN attached to a physical host to a VM via RDM when the physical host died. I was able to preserver the entire volume and had no issues. &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Fri, 05 Nov 2010 14:31:43 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/RAW-DEVICE-MAPPINGs/m-p/1657114#M147115</guid>
      <dc:creator>Cyberfed27</dc:creator>
      <dc:date>2010-11-05T14:31:43Z</dc:date>
    </item>
    <item>
      <title>Re: RAW DEVICE MAPPINGs</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/RAW-DEVICE-MAPPINGs/m-p/1657115#M147116</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Thanks for the explanation - a VM is able to connect to more than one LUN?&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Fri, 05 Nov 2010 14:38:25 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/RAW-DEVICE-MAPPINGs/m-p/1657115#M147116</guid>
      <dc:creator>joeflint</dc:creator>
      <dc:date>2010-11-05T14:38:25Z</dc:date>
    </item>
    <item>
      <title>Re: RAW DEVICE MAPPINGs</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/RAW-DEVICE-MAPPINGs/m-p/1657116#M147117</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Absolutely. Assuming permissions on the LUNS are set correctly on the SAN.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;What you don't want to do is share LUN access to two servers at the same time (unless in a clustered setup where there is a watchdog).&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;For example you dont' want server A and Server B to both have access to a windows LUN.  That's bad times. &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Fri, 05 Nov 2010 14:40:58 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/RAW-DEVICE-MAPPINGs/m-p/1657116#M147117</guid>
      <dc:creator>Cyberfed27</dc:creator>
      <dc:date>2010-11-05T14:40:58Z</dc:date>
    </item>
    <item>
      <title>Re: RAW DEVICE MAPPINGs</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/RAW-DEVICE-MAPPINGs/m-p/1657117#M147118</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;I see that you were able to move a LUN from a physical to tha virtual host successfully.&amp;nbsp; Have you ever tried to do the opposite?&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;I have a VM with an attached RDM that needs to be moved to a physical host.&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Has anyone tried this? &lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Mon, 20 Aug 2012 23:48:56 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/RAW-DEVICE-MAPPINGs/m-p/1657117#M147118</guid>
      <dc:creator>jlitnyc</dc:creator>
      <dc:date>2012-08-20T23:48:56Z</dc:date>
    </item>
    <item>
      <title>Re: RAW DEVICE MAPPINGs</title>
      <link>https://communities.vmware.com/t5/ESXi-Discussions/RAW-DEVICE-MAPPINGs/m-p/1657118#M147119</link>
      <description>&lt;HTML&gt;&lt;HEAD&gt;&lt;/HEAD&gt;&lt;BODY&gt;&lt;P&gt;Hi Jlitnyc,&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-size: 12pt;"&gt;&lt;STRONG&gt;"I have a VM with an attached RDM that needs to be moved to a physical host.&lt;/STRONG&gt;&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-size: 12pt;"&gt;&lt;STRONG&gt; &lt;/STRONG&gt;&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;SPAN style="font-size: 12pt;"&gt;&lt;STRONG&gt;Has anyone tried this?"&lt;/STRONG&gt;&lt;/SPAN&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;We tried this and it works but in order to acomplish this you have to follow few steps..&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;I assume it is windows VM..&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Take a complete backup of that specific Lun&lt;/P&gt;&lt;P&gt;Set the drive offline from windows disk management &lt;/P&gt;&lt;P&gt;Remove the lun from the vm...&lt;/P&gt;&lt;P&gt;From the SAN end ---Remove the lun number from the ESXi host so that they can't see the lun any more.&lt;/P&gt;&lt;P&gt;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp;&amp;nbsp; Add the lun to physical machine &lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Assuming the physical server iscsi initiator is already configured.You can configure the rest on the physical machine&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;&lt;/P&gt;&lt;P&gt;Thanks&lt;/P&gt;&lt;P&gt;SA&lt;/P&gt;&lt;/BODY&gt;&lt;/HTML&gt;</description>
      <pubDate>Tue, 21 Aug 2012 09:25:00 GMT</pubDate>
      <guid>https://communities.vmware.com/t5/ESXi-Discussions/RAW-DEVICE-MAPPINGs/m-p/1657118#M147119</guid>
      <dc:creator>sa2057</dc:creator>
      <dc:date>2012-08-21T09:25:00Z</dc:date>
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