{"id":744,"date":"2014-09-09T01:26:09","date_gmt":"2014-09-09T01:26:09","guid":{"rendered":"http:\/\/www.theSQLReport.com\/?p=744"},"modified":"2014-11-19T11:54:11","modified_gmt":"2014-11-19T11:54:11","slug":"os-kernel-parameter-swappiness-warning","status":"publish","type":"post","link":"https:\/\/www.theSQLReport.com\/?p=744","title":{"rendered":"OS Kernel Parameter: swappiness Warning"},"content":{"rendered":"

Recently I was installing the Oracle Grid Infrastructure – 11g2R on a virtual Linux server.\u00a0 When the install process came to the Perform Prerequisite Checks screen, I received a warning on the OS Kernel Parameter: swappiness.<\/p>\n

\"Warning_Swappiness\"<\/a><\/p>\n

The lower text box displayed the following details:<\/p>\n

This is a prerequisite condition to test whether the OS kernel parameter \"swappiness\" is properly set.\r\nExpected Value\r\n :\u00a0Current=100; Configured=100\r\n Actual Value\r\n :\u00a0Current=60; Configured=unknown<\/pre>\n
When I clicked on the “more details” link, a pop-up box gave me similar information as the lower text box.<\/p>\n
\"Warning_Swappiness_Details\"<\/a>Below is the text from the “Details” pop-up box:<\/p>\n
OS Kernel Parameter: swappiness - This is a prerequisite condition to test whether the OS kernel parameter \"swappiness\" is properly set.\r\n Expected Value\r\n :\u00a0Current=100; Configured=100\r\n Actual Value\r\n :\u00a0Current=60; Configured=unknown\r\n Details:\r\n -\r\n PRVG-1201 : OS kernel parameter \"swappiness\" does not have proper value on node \"hlpoem01\" [Expected = \"100\" ; Current = \"60\"; Configured = \"unknown\"].\r\n- Cause:\u00a0<null>\r\n- Action:\u00a0<null><\/pre>\n
Resolution (MUST BE DONE AS ROOT):<\/h3>\n
In a different session window as root or a super user, I update the OS swappiness parameter.\u00a0 Below is the text I used, which in bold is nice for cutting & pasting.<\/p>\n
First, view the current contents of the \/proc\/sys\/vm\/swappiness file.<\/p>\n
> cat \/proc\/sys\/vm\/swappiness<\/strong><\/pre>\n
The default linux OS parameter is 60.<\/p>\n
To fix the OS until the next server reboot:<\/p>\n
> echo 100 > \/proc\/sys\/vm\/swappiness<\/strong><\/pre>\n
Then to fix the OS settings permanently after the next server reboot:<\/p>\n
> echo vm.swappiness=100 >> \/etc\/sysctl.conf<\/strong><\/pre>\n
Then I verified the change so that I could continue installing the Oracle Grid Infrastructure:<\/p>\n
> cat \/proc\/sys\/vm\/swappiness<\/strong><\/pre>\n
\"Linux_Swappiness_Change\"<\/a><\/p>\n
I clicked on the Check Again button.<\/p>\n
\"Warning_Swappiness_CheckAgain\"<\/a><\/p>\n
Finally, the warning was gone.<\/p>\n
\"Swappiness_Succeeded\"<\/a><\/p>\n
The Wikipedia page on Swappiness<\/a> has more details on this parameter.<\/p>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
Recently I was installing the Oracle Grid Infrastructure – 11g2R on a virtual Linux server.\u00a0 When the install process came to the Perform Prerequisite Checks screen, I received a warning … Continue Reading →<\/a><\/p>\n","protected":false},"author":1,"featured_media":749,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[33,32,31],"class_list":["post-744","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-oracle","tag-oracle-grid","tag-os-kernel","tag-swappiness"],"_links":{"self":[{"href":"https:\/\/www.theSQLReport.com\/index.php?rest_route=\/wp\/v2\/posts\/744"}],"collection":[{"href":"https:\/\/www.theSQLReport.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.theSQLReport.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.theSQLReport.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.theSQLReport.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=744"}],"version-history":[{"count":13,"href":"https:\/\/www.theSQLReport.com\/index.php?rest_route=\/wp\/v2\/posts\/744\/revisions"}],"predecessor-version":[{"id":763,"href":"https:\/\/www.theSQLReport.com\/index.php?rest_route=\/wp\/v2\/posts\/744\/revisions\/763"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.theSQLReport.com\/index.php?rest_route=\/wp\/v2\/media\/749"}],"wp:attachment":[{"href":"https:\/\/www.theSQLReport.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=744"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.theSQLReport.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=744"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.theSQLReport.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=744"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}