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        <build-date>13-04-2023</build-date>
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            <title>[DOCS-828] conflicting recommendations for read-ahead settings on software raid</title>
                <link>https://jira.mongodb.org/browse/DOCS-828</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;From &lt;a href=&quot;http://www.mongodb.org/display/DOCS/Amazon+EC2+Quickstart&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/Amazon+EC2+Quickstart&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;$ sudo blockdev --setra 128 /dev/md0&lt;br/&gt;
$ sudo blockdev --setra 128 /dev/sdh1&lt;br/&gt;
$ sudo blockdev --setra 128 /dev/sdh2&lt;br/&gt;
$ sudo blockdev --setra 128 /dev/sdh3&lt;br/&gt;
$ sudo blockdev --setra 128 /dev/sdh4&lt;/p&gt;

&lt;p&gt;From &lt;a href=&quot;http://www.mongodb.org/display/DOCS/Readahead&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.mongodb.org/display/DOCS/Readahead&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;RAID on EC2: If you are following our Amazon EC2 guidelines, and running with multiple EBS volumes in a software RAID configuration, then the recommendation is to set the readahead to 0 on the volumes that make up the RAID array while setting the readahead to the value you want on the RAID volume itself.&lt;/p&gt;</description>
                <environment></environment>
        <key id="57933">DOCS-828</key>
            <summary>conflicting recommendations for read-ahead settings on software raid</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="9">Done</resolution>
                                        <assignee username="jsr">Jared Rosoff</assignee>
                                    <reporter username="rassi">J Rassi</reporter>
                        <labels>
                    </labels>
                <created>Thu, 29 Nov 2012 20:23:21 +0000</created>
                <updated>Wed, 4 Sep 2013 12:28:14 +0000</updated>
                            <resolved>Thu, 29 Aug 2013 02:16:30 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>3</watches>
                                                                                                                <comments>
                            <comment id="413703" author="jsr" created="Thu, 29 Aug 2013 02:16:30 +0000"  >&lt;p&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;EC2 quick start guide&lt;/a&gt; has been updated. It now conforms to the recommendations made elsewhere in our &lt;a href=&quot;http://docs.mongodb.org/manual/administration/production-notes/#readahead&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;docs about Readheads&lt;/a&gt;.  &lt;/p&gt;</comment>
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