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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>[SERVER-38912] Repair fails WT_CURSOR.next: read checksum error</title>
                <link>https://jira.mongodb.org/browse/SERVER-38912</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;I have a micro-service cluster with a NFS share, normally only one instance of mongodb (docker&apos;s mongo) is running. After a crash of the cluster I cannot bring the DB back up, the repair fails violently:&lt;/p&gt;

&lt;p&gt;E STORAGE &lt;span class=&quot;error&quot;&gt;&amp;#91;initandlisten&amp;#93;&lt;/span&gt; WiredTiger error (0) &lt;span class=&quot;error&quot;&gt;&amp;#91;1547049030:493990&amp;#93;&lt;/span&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;10:0x7f75f72aea00&amp;#93;&lt;/span&gt;, &lt;a href=&quot;file:WiredTiger.wt&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;file:WiredTiger.wt&lt;/a&gt;, WT_CURSOR.next: read checksum error for 28672B block at offset 16384: block header checksum of 806183382 doesn&apos;t match expected checksum of 619640434 Raw: &lt;span class=&quot;error&quot;&gt;&amp;#91;1547049030:493990&amp;#93;&lt;/span&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;10:0x7f75f72aea00&amp;#93;&lt;/span&gt;, &lt;a href=&quot;file:WiredTiger.wt&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;file:WiredTiger.wt&lt;/a&gt;, WT_CURSOR.next: read checksum error for 28672B block at offset 16384: block header checksum of 806183382 doesn&apos;t match expected checksum of 619640434&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;and displays multiple chunks of data.&lt;/p&gt;

&lt;p&gt;I&apos;d appreciate any help in restoring the DB, it wasn&apos;t backed up and wasn&apos;t part of a replicate neither... I attached the faulty WiredTiger.wt, the mongod --repair output and the WiredTiger.turtle (as it seems to be useful for repairing).&lt;/p&gt;</description>
                <environment></environment>
        <key id="668222">SERVER-38912</key>
            <summary>Repair fails WT_CURSOR.next: 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="foloex">R&#233;mi AUGUSTE</reporter>
                        <labels>
                            <label>wt-repair-success</label>
                    </labels>
                <created>Wed, 9 Jan 2019 16:08:43 +0000</created>
                <updated>Thu, 10 Jan 2019 01:49:10 +0000</updated>
                            <resolved>Thu, 10 Jan 2019 01:49:10 +0000</resolved>
                                    <version>4.0.1</version>
                                                    <component>WiredTiger</component>
                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="2110689" author="thomas.schubert" created="Thu, 10 Jan 2019 01:49:10 +0000"  >&lt;p&gt;Thanks for the follow up, &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=foloex&quot; class=&quot;user-hover&quot; rel=&quot;foloex&quot;&gt;foloex&lt;/a&gt;. I&apos;m glad you were able to take advantage of the improvements we made in &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-19815&quot; title=&quot;Improved mongod --repair option for WiredTiger&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-19815&quot;&gt;&lt;del&gt;SERVER-19815&lt;/del&gt;&lt;/a&gt;.&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 or server failures. &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;Make sure to update MongoDB to the &lt;a href=&quot;https://docs.mongodb.com/manual/release-notes/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;most recent version&lt;/a&gt;.&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;Thank you,&lt;br/&gt;
Kelsey&lt;/p&gt;</comment>
                            <comment id="2110036" author="foloex" created="Wed, 9 Jan 2019 16:43:05 +0000"  >&lt;p&gt;I managed to repair the DB using the latest mongodb (4.0.5) and it was able to run back with docker&apos;s&#160; version (4.0.1). It&apos;s running fine now &lt;img class=&quot;emoticon&quot; src=&quot;https://jira.mongodb.org/images/icons/emoticons/smile.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;</comment>
                    </comments>
                    <attachments>
                            <attachment id="205838" name="WiredTiger.turtle" size="1054" author="foloex" created="Wed, 9 Jan 2019 16:05:48 +0000"/>
                            <attachment id="205837" name="WiredTiger.wt" size="131072" author="foloex" created="Wed, 9 Jan 2019 16:05:53 +0000"/>
                            <attachment id="205836" name="repair.log" size="194990" author="foloex" created="Wed, 9 Jan 2019 16:08:34 +0000"/>
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