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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-9620] White Paper readahead recommendations contradict our production notes</title>
                <link>https://jira.mongodb.org/browse/DOCS-9620</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;&lt;a href=&quot;https://webassets.mongodb.com/_com_assets/collateral/MongoDB-Performance-Best-Practices.pdf&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://webassets.mongodb.com/_com_assets/collateral/MongoDB-Performance-Best-Practices.pdf&lt;/a&gt; has the following:&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;Readahead size should be set to 32. Use the&lt;br/&gt;
blockdev --setra &amp;lt;value&amp;gt; command to set the&lt;br/&gt;
readahead block size to 32 (16kb) or the size of most&lt;br/&gt;
documents, whichever is larger.&lt;br/&gt;
If the readahead size is much larger than the size of the&lt;br/&gt;
data requested, a larger block will be read from disk &#8211; this&lt;br/&gt;
is wasteful as most disk I/O in MongoDB is random. This&lt;br/&gt;
has two undesirable consequences:&lt;br/&gt;
8&lt;br/&gt;
1. The size of the read will consume RAM unnecessarily.&lt;br/&gt;
2. More time will be spent reading data than is necessary.&lt;br/&gt;
Both will negatively affect the performance of your&lt;br/&gt;
MongoDB system. The readahead block size should not&lt;br/&gt;
be set lower than 32.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;Note: &quot;The readahead block size should not be set lower than 32.&quot;&lt;/p&gt;

&lt;p&gt;This contradicts our &lt;a href=&quot;https://docs.mongodb.com/manual/administration/production-notes/#recommended-configuration&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;production notes&lt;/a&gt;, which recommend 16 or 0 and are themselves the subject of &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-9158&quot; title=&quot;WiredTiger readahead values&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-9158&quot;&gt;&lt;del&gt;DOCS-9158&lt;/del&gt;&lt;/a&gt;, which calls for a change to 0 only.&lt;/p&gt;

&lt;p&gt;The white paper should be corrected to recommend a setting of 0 for WT.&lt;/p&gt;</description>
                <environment></environment>
        <key id="337276">DOCS-9620</key>
            <summary>White Paper readahead recommendations contradict our production notes</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="3">Duplicate</resolution>
                                        <assignee username="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="eric.sommer@mongodb.com">Eric Sommer</reporter>
                        <labels>
                    </labels>
                <created>Thu, 8 Dec 2016 14:15:11 +0000</created>
                <updated>Wed, 21 Jun 2017 13:06:01 +0000</updated>
                            <resolved>Thu, 8 Dec 2016 16:20:50 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="1452435" author="kay.kim@10gen.com" created="Thu, 8 Dec 2016 16:20:50 +0000"  >&lt;p&gt;Work done by marketing via MARKETING-8994.&lt;/p&gt;</comment>
                            <comment id="1452434" author="kay.kim@10gen.com" created="Thu, 8 Dec 2016 16:19:51 +0000"  >&lt;p&gt;Great.  Thank you!  &lt;/p&gt;</comment>
                            <comment id="1452313" author="andrew.morgan" created="Thu, 8 Dec 2016 15:00:20 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=kay%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;kay@mongodb.com&quot;&gt;kay@mongodb.com&lt;/a&gt; Yes &#8211; we look after the white papers. Please go ahead and assign this to me and I&apos;ll fix it.&lt;/p&gt;

&lt;p&gt;Thanks, Andrew.&lt;/p&gt;</comment>
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