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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-1493] Warn user about enabling --directoryperdb with existing databases</title>
                <link>https://jira.mongodb.org/browse/DOCS-1493</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;TBH, I&apos;m not sure if the following is by design, but at minimum, it needs some warning/clarification in the documentation.  Mixing databases created without &apos;&lt;tt&gt;&amp;#45;&amp;#45;directoryperdb&lt;/tt&gt;&apos; and databases created with &apos;&lt;tt&gt;&amp;#45;&amp;#45;directoryperdb&lt;/tt&gt;&apos; does not work.&lt;/p&gt;

&lt;p&gt;If a user has an existing &lt;tt&gt;mongod&lt;/tt&gt; running w/o &apos;&lt;tt&gt;&amp;#45;&amp;#45;directoryperdb&lt;/tt&gt;&apos; but restarts w/ it enabled, old databases will no longer be addressable.  For example, before enabling &apos;&lt;tt&gt;&amp;#45;&amp;#45;directoryperdb&lt;/tt&gt;&apos;, my &lt;tt&gt;dbpath&lt;/tt&gt; looks something like:&lt;/p&gt;
&lt;p/&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-rwxr-xr-x   1 slee  wheel          5 May  8 09:41 mongod.lock&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-rw-------   1 slee  wheel   67108864 May  7 13:47 test.0&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-rw-------   1 slee  wheel  134217728 May  7 13:26 test.1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-rw-------   1 slee  wheel   16777216 May  7 13:44 test.ns&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;Subsequently, I enable &apos;&lt;tt&gt;&amp;#45;&amp;#45;directoryperdb&lt;/tt&gt;&apos; but when I query for anything inside of the &lt;tt&gt;test&lt;/tt&gt; database, &lt;tt&gt;mongod&lt;/tt&gt; expects to find &lt;tt&gt;test&lt;/tt&gt;&apos;s data files organized in the following fashion.&lt;/p&gt;
&lt;p/&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-rw-------   1 slee  wheel   67108864 May  7 13:47 test/test.0&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-rw-------   1 slee  wheel  134217728 May  7 13:26 test/test.1&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;-rw-------   1 slee  wheel   16777216 May  7 13:44 test/test.ns&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;Stopping &lt;tt&gt;mongod&lt;/tt&gt;, moving the &lt;tt&gt;test&lt;/tt&gt; data files into a &apos;&lt;tt&gt;test&lt;/tt&gt;&apos; subdirectory of the &lt;tt&gt;dbpath&lt;/tt&gt; root, and starting &lt;tt&gt;mongod &amp;#45;&amp;#45;directoryperdb&lt;/tt&gt; seems to work (w/o any deeper testing...); I can address the &lt;tt&gt;test&lt;/tt&gt; database again.&lt;/p&gt;

&lt;p&gt;This is an important distinction because a user could want to use &apos;&lt;tt&gt;&amp;#45;&amp;#45;directoryperdb&lt;/tt&gt;&apos; to take advantage of a &lt;tt&gt;dbpath&lt;/tt&gt; spanning multiple disks, but the user should be aware of having to potentially migrate existing databases before enabling &apos;&lt;tt&gt;&amp;#45;&amp;#45;directoryperdb&lt;/tt&gt;&apos;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="74626">DOCS-1493</key>
            <summary>Warn user about enabling --directoryperdb with existing databases</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="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="stephen.lee">Stephen Lee</reporter>
                        <labels>
                    </labels>
                <created>Wed, 8 May 2013 14:04:39 +0000</created>
                <updated>Wed, 8 May 2013 17:03:12 +0000</updated>
                            <resolved>Wed, 8 May 2013 17:03:06 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="331211" author="auto" created="Wed, 8 May 2013 17:03:12 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-05-08T15:57:18Z&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-1493&quot; title=&quot;Warn user about enabling --directoryperdb with existing databases&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-1493&quot;&gt;&lt;del&gt;DOCS-1493&lt;/del&gt;&lt;/a&gt; note about moving to directoryperdb&lt;br/&gt;
Branch: v2.2&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/2dd3324422c756ad491c0e1df32c1e8806dcd847&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/2dd3324422c756ad491c0e1df32c1e8806dcd847&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="331210" author="auto" created="Wed, 8 May 2013 17:03:08 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-05-08T15:57:18Z&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-1493&quot; title=&quot;Warn user about enabling --directoryperdb with existing databases&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-1493&quot;&gt;&lt;del&gt;DOCS-1493&lt;/del&gt;&lt;/a&gt; note about moving to directoryperdb&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/c93be4ab9fbec1448ecb3a7b0a71605b0eb71ded&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/c93be4ab9fbec1448ecb3a7b0a71605b0eb71ded&lt;/a&gt;&lt;/p&gt;</comment>
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