{"id":3280,"date":"2016-10-03T08:20:20","date_gmt":"2016-10-03T07:20:20","guid":{"rendered":"http:\/\/tomaskalabis.com\/wordpress\/?p=3280"},"modified":"2016-10-07T14:51:46","modified_gmt":"2016-10-07T13:51:46","slug":"vmware-esxi-very-slow-boot-with-rdm-luns-used-by-mscs","status":"publish","type":"post","link":"https:\/\/tomaskalabis.com\/wordpress\/vmware-esxi-very-slow-boot-with-rdm-luns-used-by-mscs\/","title":{"rendered":"VMware ESXi very slow boot with RDM LUNs used by MSCS"},"content":{"rendered":"<h3>VMware ESXi very slow boot with RDM LUNs used by MSCS<\/h3>\n<p>When RDM (Raw Device Mappings) are used in in VMware vSphere, my 2 ESXi host (VMware ESXi 6.0.0 4192238) can take a very long time to boot (30 minutes), when i rescaned datastores ESXi server freezed. I tryed disconnect FC cables and iSCSI cables, same problem.<\/p>\n<ul>\n<li><strong>updated 07\/10\/2016 &#8211; it&#8217;s doesn&#8217;t matter if you have FC or iSCSI connectivity, problem is with both<\/strong><\/li>\n<\/ul>\n<p>Solution is very simple, first of all you need enable SSH to the affected ESXi host, you can enable it in console (troubleshooting options) or via vSphere Client\/vSphere Web Client in Configuration of ESXi host &gt;Security Profile &gt; Properties &gt; Start SSH Service. <a href=\"http:\/\/tomaskalabis.com\/wordpress\/vmware-esxi-how-enable-ssh-on-esxi-host\/\" target=\"_blank\">How to Enable SSH on ESXi host. <\/a><\/p>\n<pre class=\"lang:default decode:true\">esxcli storage core path list<\/pre>\n<p>Run Putty or your favourite SSH client and connect to affected ESXi host. When you are logged in, you need list LUNs (device), now identify naa.xxx of your RDM mappings.<\/p>\n<pre class=\"lang:default decode:true\">fc.20000024ff7c1f4a:21000024ff7c1f4a-fc.500000e0da097040:500000e0da097021-naa.600000e00d2800000028097000040000\r\n\u00a0\u00a0 UID: fc.20000024ff7c1f4a:21000024ff7c1f4a-fc.500000e0da097040:500000e0da097021-<strong>naa.600000e00d2800000028097000040000<\/strong>\r\n\u00a0\u00a0 Runtime Name: vmhba2:C0:T0:L4\r\n\u00a0\u00a0 Device: naa.600000e00d2800000028097000040000\r\n\u00a0\u00a0 Device Display Name: FUJITSU Fibre Channel Disk (naa.600000e00d2800000028097000040000)\r\n\u00a0\u00a0 Adapter: vmhba2\r\n\u00a0\u00a0 Channel: 0\r\n\u00a0\u00a0 Target: 0\r\n\u00a0\u00a0 LUN: 4\r\n\u00a0\u00a0 Plugin: NMP\r\n\u00a0\u00a0 State: active\r\n\u00a0\u00a0 Transport: fc\r\n\u00a0\u00a0 Adapter Identifier: fc.20000024ff7c1f4a:21000024ff7c1f4a\r\n\u00a0\u00a0 Target Identifier: fc.500000e0da097040:500000e0da097021\r\n\u00a0\u00a0 Adapter Transport Details: WWNN: 20:00:00:24:ff:7c:1f:4a WWPN: 21:00:00:24:ff:7c:1f:4a\r\n\u00a0\u00a0 Target Transport Details: WWNN: 50:00:00:e0:da:09:70:40 WWPN: 50:00:00:e0:da:09:70:21\r\n\u00a0\u00a0 Maximum IO Size: 33553920<\/pre>\n<p>In my case it was 3 devices:<\/p>\n<ul>\n<li>naa.600000e00d2800000028097000020000<\/li>\n<li>naa.600000e00d2800000028097000030000<\/li>\n<li>naa.600000e00d2800000028097000040000<\/li>\n<\/ul>\n<pre class=\"lang:default decode:true \">esxcli storage core device setconfig -d naa.600000e00d2800000028097000020000 --perennially-reserved=true\r\nesxcli storage core device setconfig -d naa.600000e00d2800000028097000030000 --perennially-reserved=true\r\nesxcli storage core device setconfig -d naa.600000e00d2800000028097000040000 --perennially-reserved=true<\/pre>\n<p>We need run script, which Enable the Perennially-Reserved Setting for these 3 devices and run it on affected ESXi hosts.<\/p>\n<p>To verify, that startup process of ESXi host has become quicker you need reboot the ESXi host. After reboot\u00a0try rescan datastores.<\/p>\n<p>Dont forged stop SSH Service on your ESXi hosts.<\/p>\n<ul>\n<li><strong>Update 07\/10\/2016<\/strong><\/li>\n<\/ul>\n<p>Third server Fujitsu RX200 S8 with latest VMware ESXi 6.0.0 4192238, only 2-port 10 GbE card and software iSCSI adapter. Without perennially-reserverd booting for 4,5 hour&#8230; With Perentially-Reservet Settings booting for 10 minutes, so lets try change settings of iSCSI with<strong> Static Targets instead of Dynamic Targets<\/strong>. now 6 min to boot.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>VMware ESXi very slow boot with RDM LUNs used by MSCS When RDM (Raw Device Mappings) are used in in VMware vSphere, my 2 ESXi host (VMware ESXi 6.0.0 4192238) &#8230;<\/p>\n","protected":false},"author":2,"featured_media":2119,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[61,224,113],"tags":[220,258,259,80],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>VMware ESXi very slow boot with RDM LUNs used by MSCS<\/title>\n<meta name=\"description\" content=\"VMware ESXi very slow boot with RDM LUNs used by MSCS - 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