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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
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    <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-164] Create wiki page explaining disk readahead</title>
                <link>https://jira.mongodb.org/browse/DOCS-164</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;We have a lot of CS tickets / consulting engagements that end in needing to adjust (usually turn down) disk readahead.&lt;/p&gt;

&lt;p&gt;We should have some documentation around the affects of disk read-ahead, how to view and change it, and when it&apos;s a good idea to do so.&lt;/p&gt;

&lt;p&gt;We should also have a page &quot;Why isn&apos;t mongo using all available RAM?&quot; that links to this page.&lt;/p&gt;</description>
                <environment></environment>
        <key id="33013">DOCS-164</key>
            <summary>Create wiki page explaining disk readahead</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="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="spencer@mongodb.com">Spencer Brody</reporter>
                        <labels>
                    </labels>
                <created>Wed, 14 Mar 2012 23:08:04 +0000</created>
                <updated>Mon, 30 Oct 2023 22:07:51 +0000</updated>
                            <resolved>Thu, 7 Apr 2016 05:32:04 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                        <due></due>
                            <votes>2</votes>
                                    <watches>12</watches>
                                                                                                                <comments>
                            <comment id="1228616" author="kay.kim@10gen.com" created="Thu, 7 Apr 2016 05:32:04 +0000"  >&lt;p&gt;I&apos;ll go ahead and close this since we do have the line in prod notes about readahead settings.  Of course, the prod notes are currently undergoing review and updates, so feel free to comment on the code reviews as they happen.&lt;/p&gt;</comment>
                            <comment id="910025" author="emilio.scalise" created="Mon, 11 May 2015 15:34:23 +0000"  >&lt;p&gt;This is related.&lt;br/&gt;
The problem is not which readahead value is the best, but give customers a good and easy way to set it.&lt;/p&gt;</comment>
                            <comment id="597630" author="jacob.ribnik" created="Tue, 27 May 2014 15:25:32 +0000"  >&lt;p&gt;Not sure where we are with this but the documentation on disk readahead should include the method for persisting settings described at:&lt;br/&gt;
&lt;a href=&quot;http://docs.mongodb.org/ecosystem/platforms/amazon-ec2/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://docs.mongodb.org/ecosystem/platforms/amazon-ec2/&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;and also the udevadm approach addressed in this linked ticket to improve that same page.&lt;/p&gt;</comment>
                            <comment id="147137" author="barrie" created="Wed, 25 Jul 2012 14:57:16 +0000"  >&lt;p&gt;Are you looking for support with this issue or suggesting a change to the documentation? &lt;/p&gt;</comment>
                            <comment id="147092" author="i.peter@external.telekom.de" created="Wed, 25 Jul 2012 13:23:19 +0000"  >&lt;p&gt;On monitoring a big migration (900Gb) in Mongo with changing READAHEAD of the database-devices&lt;br/&gt;
at 06:00am to 0 and after 14:20(02:20pm) back to 1024 we see no impacts only a big growing of &quot;page faults&quot;&lt;br/&gt;
see picture from MMS&lt;/p&gt;</comment>
                    </comments>
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            <issuekey id="52960">SERVER-7335</issuekey>
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            <issuekey id="174770">DOCS-4534</issuekey>
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            <issuekey id="138143">DOCS-3478</issuekey>
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                            <attachment id="18412" name="change_READAHEAD-Monitoring.png" size="20797" author="i.peter@external.telekom.de" created="Wed, 25 Jul 2012 13:24:13 +0000"/>
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