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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-11288] Recommend allocating separate device for the dbpath/journal</title>
                <link>https://jira.mongodb.org/browse/DOCS-11288</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;We have encountered numerous instances of performance issues resulting from a collision of io requests from checkpoints and journal writes.&lt;/p&gt;

&lt;p&gt;The symptoms are a known performance issue resulting from placing the dbPath directory and the WiredTiger journal directory on the same filesystem. The bursts of IO to WiredTiger datafiles that occur at the end of each checkpoint when filesystem buffers are flushed to disk can saturate the disk, delaying writes to the journal files, and producing small IO &quot;stalls&quot; exactly like those observed on the mongod logfiles.&lt;/p&gt;

&lt;p&gt;The remedy to this problem is relatively simple &amp;#8211; to place the mongod dbPath directory and the mongod dbPath/journal directory on separate physical devices and use a symlink to point to the journal directory from the mongod dbPath.&lt;/p&gt;

&lt;p&gt;Physically separating the IO removes the contention between database files and journal files during checkpoints, and prevents the small IO stalls observed in this case and others like it.&lt;/p&gt;</description>
                <environment></environment>
        <key id="493139">DOCS-11288</key>
            <summary>Recommend allocating separate device for the dbpath/journal</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="shakir.sadikali@mongodb.com">Shakir Sadikali</reporter>
                        <labels>
                            <label>production-notes</label>
                    </labels>
                <created>Tue, 6 Feb 2018 14:43:50 +0000</created>
                <updated>Mon, 30 Oct 2023 21:01:52 +0000</updated>
                                                            <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>production</component>
                        <due></due>
                            <votes>5</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="4940623" author="edu.bot" created="Mon, 31 Oct 2022 16:08:14 +0000"  >&lt;p&gt;Hello! This ticket has been closed due to inactivity. If you believe this ticket is still important, please reopen it and leave a comment to explain why. Thank you!&lt;/p&gt;</comment>
                            <comment id="1797271" author="thomas.schubert" created="Tue, 6 Feb 2018 20:47:44 +0000"  >&lt;p&gt;I think the important distinction that needs to be clarified is that even if disk capacity is not regularly fully utilized, users may see improved query latency by moving the journal to a different path.&lt;/p&gt;</comment>
                            <comment id="1796723" author="shakir.sadikali" created="Tue, 6 Feb 2018 15:25:24 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ravind.kumar&quot; class=&quot;user-hover&quot; rel=&quot;ravind.kumar&quot;&gt;ravind.kumar&lt;/a&gt; - I have.  I believe we need to expand on that description.  Perhaps use some of the text in the description (written by &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=mark.brinsmead&quot; class=&quot;user-hover&quot; rel=&quot;mark.brinsmead&quot;&gt;mark.brinsmead&lt;/a&gt;) to elaborate on the rationale for the recommendation?&lt;/p&gt;</comment>
                            <comment id="1796680" author="ravind.kumar" created="Tue, 6 Feb 2018 14:54:59 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=shakir.sadikali&quot; class=&quot;user-hover&quot; rel=&quot;shakir.sadikali&quot;&gt;shakir.sadikali&lt;/a&gt; - have you seen &lt;a href=&quot;https://docs.mongodb.com/manual/administration/production-notes/#separate-components-onto-different-storage-devices&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;this section in our production notes?&lt;/a&gt;. I believe it covers your concerns.&lt;/p&gt;</comment>
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