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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-1537] Comment on: &quot;manual/administration/production-notes.txt&quot;</title>
                <link>https://jira.mongodb.org/browse/DOCS-1537</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;I&apos;m receiving this warning when starting my MongoDB shell:&lt;/p&gt;

&lt;p&gt;Wed Mar 20 22:40:49.850 &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt;&lt;/p&gt;

&lt;p&gt;Wed Mar 20 22:40:49.850 &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; ** WARNING: Readahead for /data is set to 2048KB&lt;/p&gt;

&lt;p&gt;Wed Mar 20 22:40:49.850 &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; ** We suggest setting it to 256KB (512 sectors) or less&lt;/p&gt;

&lt;p&gt;Wed Mar 20 22:40:49.850 &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; ** &lt;a href=&quot;http://dochub.mongodb.org/core/readahead&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://dochub.mongodb.org/core/readahead&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;I&apos;ve used:&lt;/p&gt;

&lt;p&gt;df /data&lt;/p&gt;

&lt;p&gt;To find where the drive is that my data is mounted and subsequently used:&lt;/p&gt;

&lt;p&gt;sudo blockdev --setra 256 /dev/mapper/vg0-data&lt;/p&gt;

&lt;p&gt;to set the readahead to the 256 that was specified. I&apos;ve confirmed this has worked with:&lt;/p&gt;

&lt;p&gt;sudo blockdev --getra /dev/mapper/vg0-data&lt;/p&gt;

&lt;p&gt;I&apos;m still however getting the same error when starting my shell?&lt;/p&gt;

&lt;p&gt;UPDATE&lt;/p&gt;

&lt;p&gt;I&apos;ve restarted the mongodb server instance and am still receiving this error.&lt;/p&gt;

&lt;p&gt;UPDATE 2&lt;/p&gt;

&lt;p&gt;My linux server is hosted on AWS and therefore uses virtual volumes. I have set the readahead value for all those volumes to 256 and still receive this error.&lt;/p&gt;

</description>
                <environment>Linux, AWS&lt;br/&gt;
&lt;br/&gt;
*Location*: &lt;a href=&quot;http://docs.mongodb.org/manual/administration/production-notes/#readahead&quot;&gt;http://docs.mongodb.org/manual/administration/production-notes/#readahead&lt;/a&gt;&lt;br/&gt;
*User-Agent*: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_5) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.65 Safari/537.31&lt;br/&gt;
*Referrer*: &lt;a href=&quot;http://stackoverflow.com/questions/16715961/mongodb-readahead-warning&quot;&gt;http://stackoverflow.com/questions/16715961/mongodb-readahead-warning&lt;/a&gt;&lt;br/&gt;
*Screen Resolution*: 1440 x 900&lt;br/&gt;
*repo*: docs&lt;br/&gt;
*source*: administration/production-notes&lt;br/&gt;
</environment>
        <key id="76367">DOCS-1537</key>
            <summary>Comment on: &quot;manual/administration/production-notes.txt&quot;</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</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="9">Done</resolution>
                                        <assignee username="barrie">Barrie Segal</assignee>
                                    <reporter username="auto">auto</reporter>
                        <labels>
                            <label>collector-298ba4e7</label>
                    </labels>
                <created>Thu, 23 May 2013 16:08:03 +0000</created>
                <updated>Mon, 7 Mar 2022 19:59:40 +0000</updated>
                            <resolved>Wed, 12 Jun 2013 23:52:44 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="4396194" author="xgen-internal-githook" created="Mon, 7 Mar 2022 19:59:40 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dave&apos;, &apos;email&apos;: &apos;69165704+davemungo@users.noreply.github.com&apos;, &apos;username&apos;: &apos;davemungo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-1537&quot; title=&quot;Comment on: &amp;quot;manual/administration/production-notes.txt&amp;quot;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-1537&quot;&gt;&lt;del&gt;DOCS-1537&lt;/del&gt;&lt;/a&gt; BACKPORT (#749)&lt;br/&gt;
Branch: v4.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/docs-mongodb-internal/commit/21739db6bade9dcfb83653ab4876fafde72333a6&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/docs-mongodb-internal/commit/21739db6bade9dcfb83653ab4876fafde72333a6&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4396192" author="xgen-internal-githook" created="Mon, 7 Mar 2022 19:59:20 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dave&apos;, &apos;email&apos;: &apos;69165704+davemungo@users.noreply.github.com&apos;, &apos;username&apos;: &apos;davemungo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-1537&quot; title=&quot;Comment on: &amp;quot;manual/administration/production-notes.txt&amp;quot;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-1537&quot;&gt;&lt;del&gt;DOCS-1537&lt;/del&gt;&lt;/a&gt; BACKPORT (#748)&lt;br/&gt;
Branch: v5.0&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/docs-mongodb-internal/commit/ecf8b3fc1ba5811d70d2b7ef705ce1881b84b009&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/docs-mongodb-internal/commit/ecf8b3fc1ba5811d70d2b7ef705ce1881b84b009&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4396191" author="xgen-internal-githook" created="Mon, 7 Mar 2022 19:59:02 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Dave&apos;, &apos;email&apos;: &apos;69165704+davemungo@users.noreply.github.com&apos;, &apos;username&apos;: &apos;davemungo&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-1537&quot; title=&quot;Comment on: &amp;quot;manual/administration/production-notes.txt&amp;quot;&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-1537&quot;&gt;&lt;del&gt;DOCS-1537&lt;/del&gt;&lt;/a&gt; BACKPORT (#747)&lt;br/&gt;
Branch: v5.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/docs-mongodb-internal/commit/c3402063c79b9acfd460ff3fb52b53a17e78207c&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/docs-mongodb-internal/commit/c3402063c79b9acfd460ff3fb52b53a17e78207c&lt;/a&gt;&lt;/p&gt;</comment>
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