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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>
    </build-info>


<item>
            <title>[SERVER-32512] WiredTiger.wt read checksum error</title>
                <link>https://jira.mongodb.org/browse/SERVER-32512</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;A chassis experienced a power failure with our Mongo instances on it. Attempting to run the --repair flag doesn&apos;t work and it appears the WiredTiger.wt file is corrupted. &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/sad.png&quot; height=&quot;16&quot; width=&quot;16&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/p&gt;

&lt;p&gt;Attached is a screenshot of the error and the relevant WiredTiger files.&lt;/p&gt;

&lt;p&gt;Thanks!&lt;/p&gt;

&lt;p&gt;-Jeff&lt;/p&gt;</description>
                <environment></environment>
        <key id="477775">SERVER-32512</key>
            <summary>WiredTiger.wt read checksum error</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="kelsey.schubert@mongodb.com">Kelsey Schubert</assignee>
                                    <reporter username="jeefy">Jeffrey Sica</reporter>
                        <labels>
                            <label>envns</label>
                            <label>rpo</label>
                            <label>rpu</label>
                            <label>szs</label>
                            <label>trcf</label>
                            <label>wtc</label>
                    </labels>
                <created>Tue, 2 Jan 2018 16:01:38 +0000</created>
                <updated>Fri, 27 Jul 2018 17:11:57 +0000</updated>
                            <resolved>Tue, 2 Jan 2018 18:53:53 +0000</resolved>
                                    <version>3.6.1</version>
                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="1763152" author="thomas.schubert" created="Tue, 2 Jan 2018 18:53:45 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jeefy&quot; class=&quot;user-hover&quot; rel=&quot;jeefy&quot;&gt;jeefy&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Unfortunately, this error indicates that there was corruption on the disk, most often cause by a faulty storage layer. In this situation, our best recommendation would be to &lt;a href=&quot;https://docs.mongodb.com/manual/tutorial/resync-replica-set-member/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;resync the affected node&lt;/a&gt; or &lt;a href=&quot;https://docs.mongodb.com/manual/core/backups/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;restore from a backup&lt;/a&gt; if possible.&lt;/p&gt;

&lt;p&gt;To prevent this type of problem in the future please take note of the following guidelines to help mitigate any issues related to unreliable storage layers:&lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Make sure your &lt;a href=&quot;https://docs.mongodb.com/manual/administration/production-notes/#disk-and-storage-systems&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;underlying storage is configured in an optimal way&lt;/a&gt;.&lt;/li&gt;
	&lt;li&gt;Schedule and perform regular checks of the integrity of your filesystems and disks.&lt;/li&gt;
	&lt;li&gt;Never manipulate the underlying database files in any way while &lt;tt&gt;mongod&lt;/tt&gt; is running.&lt;/li&gt;
	&lt;li&gt;Always keep up to date &lt;a href=&quot;https://docs.mongodb.com/manual/core/backups/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;backups of your databases&lt;/a&gt; and verify that you have a process in place to restore them.&lt;/li&gt;
	&lt;li&gt;Use a &lt;a href=&quot;https://docs.mongodb.com/manual/replication/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;replica set&lt;/a&gt; for improved reliability.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Kind regards,&lt;br/&gt;
Kelsey&lt;/p&gt;</comment>
                            <comment id="1763082" author="jeefy" created="Tue, 2 Jan 2018 18:00:15 +0000"  >&lt;p&gt;That was fast, thanks!&lt;/p&gt;

&lt;p&gt;We&apos;ve got progress but not resolution. It&apos;s now squawking about sizeStorer.wt&lt;/p&gt;

&lt;p&gt;I&apos;ve attached &quot;sizeStorer.wt&quot; and the startup log when running &quot;mongod --repair&quot;&lt;/p&gt;</comment>
                            <comment id="1763034" author="thomas.schubert" created="Tue, 2 Jan 2018 17:14:56 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=jeefy&quot; class=&quot;user-hover&quot; rel=&quot;jeefy&quot;&gt;jeefy&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thank you for your report. I&apos;ve attached a repair attempt of the files you provided. Please extract these files and replace them in your &lt;tt&gt;$dbpath&lt;/tt&gt; and let us know if it resolves the issue. If you are still seeing errors after replacing these files, please provide the complete logs from the affected node so that we can further investigate.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
Kelsey&lt;/p&gt;</comment>
                    </comments>
                    <attachments>
                            <attachment id="174527" name="Screen Shot 2018-01-02 at 10.58.18 AM.png" size="40608" author="jeefy" created="Tue, 2 Jan 2018 16:00:36 +0000"/>
                            <attachment id="174526" name="WiredTiger.turtle" size="994" author="jeefy" created="Tue, 2 Jan 2018 16:00:49 +0000"/>
                            <attachment id="174525" name="WiredTiger.wt" size="462848" author="jeefy" created="Tue, 2 Jan 2018 16:00:49 +0000"/>
                            <attachment id="174534" name="mongod.log" size="3157" author="jeefy" created="Tue, 2 Jan 2018 18:00:24 +0000"/>
                            <attachment id="174532" name="repair_attempt.tar.gz" size="20311" author="kelsey.schubert@mongodb.com" created="Tue, 2 Jan 2018 17:13:37 +0000"/>
                            <attachment id="174535" name="sizeStorer.wt" size="37650432" author="jeefy" created="Tue, 2 Jan 2018 18:03:31 +0000"/>
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