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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-10405] Add swappiness&gt;0 recommendation to production notes</title>
                <link>https://jira.mongodb.org/browse/DOCS-10405</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Hi,&lt;/p&gt;

&lt;p&gt;&#8220;Swappiness&#8221; is a Linux kernel setting that influences the behavior of the Virtual Memory manager when it needs to allocate a swap, ranging from 0-100. A setting of &#8220;0&#8220; tells the kernel to swap only to avoid out-of-memory problems. A setting of 100 tells it to swap aggressively to disk.&lt;/p&gt;

&lt;p&gt;With kernel version 3.5 and over, as well as kernel version 2.6.32-303 and over, a value of &quot;0&quot; may cause swap not be used. It&apos;s best to recommend having a setting of &quot;1&quot;.&lt;/p&gt;</description>
                <environment>&lt;a href=&quot;https://docs.mongodb.com/manual/administration/production-notes/index.html#mongodb-on-linux&quot;&gt;https://docs.mongodb.com/manual/administration/production-notes/index.html#mongodb-on-linux&lt;/a&gt;</environment>
        <key id="395216">DOCS-10405</key>
            <summary>Add swappiness&gt;0 recommendation to production notes</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="tony.sansone@mongodb.com">Anthony Sansone</assignee>
                                    <reporter username="tomer.yakir@mongodb.com">Tomer Yakir</reporter>
                        <labels>
                    </labels>
                <created>Sun, 18 Jun 2017 10:50:16 +0000</created>
                <updated>Mon, 30 Oct 2023 21:10:31 +0000</updated>
                            <resolved>Mon, 5 Mar 2018 20:18:28 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>Ops Manager</component>
                    <component>Server</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="1823880" author="xgen-internal-githook" created="Mon, 5 Mar 2018 23:12:19 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;email&apos;: &apos;tony.sansone@mongodb.com&apos;, &apos;name&apos;: &apos;Tony Sansone&apos;, &apos;username&apos;: &apos;atsansone&apos;}
&lt;p&gt;Message: (DOCSP-1271, &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-10405&quot; title=&quot;Add swappiness&amp;gt;0 recommendation to production notes&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-10405&quot;&gt;&lt;del&gt;DOCS-10405&lt;/del&gt;&lt;/a&gt;): Updated Production Notes.&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/93af212d7efa83beac44ba483909edc6ad650f4e&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/93af212d7efa83beac44ba483909edc6ad650f4e&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="1806170" author="tony.sansone" created="Wed, 14 Feb 2018 21:46:16 +0000"  >&lt;p&gt;Adding this information to the &lt;a href=&quot;https://docs.mongodb.com/manual/administration/production-notes/index.html#mongodb-on-linux&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;MongoDB on Linux&lt;/a&gt; section.&lt;/p&gt;</comment>
                            <comment id="1685079" author="bruce.lucas@10gen.com" created="Fri, 29 Sep 2017 12:39:12 +0000"  >&lt;p&gt;Note that the default value of 60 has been observed to cause performance issues by paging mongod memory for no good reason. &lt;a href=&quot;https://en.wikipedia.org/wiki/Swappiness&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;This article&lt;/a&gt; recommends a value of 10 for databases. We should add some advice regarding this to our production notes.&lt;/p&gt;</comment>
                            <comment id="1600604" author="tomer.yakir" created="Mon, 19 Jun 2017 13:19:30 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=pasette&quot; class=&quot;user-hover&quot; rel=&quot;pasette&quot;&gt;pasette&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;The OOM killer had killed the HEAD DB mongod processes (while it was building indexes) and swap wasn&apos;t used until swappiness was set to 1.&lt;br/&gt;
On these kernel versions, a setting of 0 may cause swap not to be used.&lt;/p&gt;</comment>
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                                        <issuelink>
            <issuekey id="550599">DOCS-11746</issuekey>
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