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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-33414] Corrupted database can&apos;t salvage checksum issue</title>
                <link>https://jira.mongodb.org/browse/SERVER-33414</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;As per the other tickets about this issue we are unable to salvage&lt;/p&gt;

&lt;p&gt;I am attaching the files so that you can help me with the repair as in the other tickets&lt;/p&gt;

&lt;p&gt;Thank You &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;

&lt;p&gt;Mongo version: 3.08&lt;/p&gt;

&lt;p&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;, connection: read checksum error for 4096B block at offset 12288: block header checksum of 3397587970 doesn&apos;t match expected checksum of 978874730&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;1519180958:967760&amp;#93;&lt;/span&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;9535:0x7f4a854b5700&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;, connection: WiredTiger.wt: encountered an illegal file format or internal value&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;1519180958:967810&amp;#93;&lt;/span&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;9535:0x7f4a854b5700&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;, connection: the process must exit and restart: WT_PANIC: WiredTiger library panic&lt;br/&gt;
lt-wt: WT_PANIC: WiredTiger library panic&lt;/p&gt;</description>
                <environment></environment>
        <key id="500452">SERVER-33414</key>
            <summary>Corrupted database can&apos;t salvage checksum issue</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="pablo.velasquez">Pablo Velasquez</reporter>
                        <labels>
                    </labels>
                <created>Wed, 21 Feb 2018 02:43:59 +0000</created>
                <updated>Wed, 21 Mar 2018 04:32:40 +0000</updated>
                            <resolved>Wed, 21 Feb 2018 17:54:00 +0000</resolved>
                                    <version>3.0.8</version>
                                                    <component>WiredTiger</component>
                                        <votes>1</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1812890" author="pablo.velasquez" created="Thu, 22 Feb 2018 15:58:53 +0000"  >&lt;p&gt;Hi Kelsey&lt;br/&gt;
the files worked very good to be able to do the salvage, but we are missing 1 year of data, is it possible for the metadata files to be pointing now to older data and for the new data to still be on the .wt files?&lt;/p&gt;

&lt;p&gt;do you guys offer a service for data recovery? or do you know of a company for this?&lt;/p&gt;</comment>
                            <comment id="1811838" author="thomas.schubert" created="Wed, 21 Feb 2018 17:53:50 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=pablo.velasquez&quot; class=&quot;user-hover&quot; rel=&quot;pablo.velasquez&quot;&gt;pablo.velasquez&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Thanks for your response. I&apos;m glad to hear that this fixed the issue and everything is working again. 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; (MongoDB 3.0 will not be supported beginning next month)&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="1811827" author="pablo.velasquez" created="Wed, 21 Feb 2018 17:45:25 +0000"  >&lt;p&gt;Thank you!&lt;br/&gt;
Thank you!&lt;br/&gt;
Thank you!&lt;br/&gt;
it worked!&lt;/p&gt;</comment>
                            <comment id="1811708" author="thomas.schubert" created="Wed, 21 Feb 2018 16:39:34 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=pablo.velasquez&quot; class=&quot;user-hover&quot; rel=&quot;pablo.velasquez&quot;&gt;pablo.velasquez&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;Thank you,&lt;br/&gt;
Kelsey&lt;/p&gt;</comment>
                    </comments>
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                            <attachment id="179613" name="WiredTiger" size="46" author="pablo.velasquez" created="Wed, 21 Feb 2018 02:43:40 +0000"/>
                            <attachment id="179612" name="WiredTiger.basecfg" size="493" author="pablo.velasquez" created="Wed, 21 Feb 2018 02:43:40 +0000"/>
                            <attachment id="179611" name="WiredTiger.turtle" size="911" author="pablo.velasquez" created="Wed, 21 Feb 2018 02:43:40 +0000"/>
                            <attachment id="179610" name="WiredTiger.wt" size="86016" author="pablo.velasquez" created="Wed, 21 Feb 2018 02:43:40 +0000"/>
                            <attachment id="179667" name="repair_attempt.tar.gz" size="3377" author="kelsey.schubert@mongodb.com" created="Wed, 21 Feb 2018 16:38:19 +0000"/>
                            <attachment id="179615" name="sizeStorer.wt" size="36864" author="pablo.velasquez" created="Wed, 21 Feb 2018 02:43:40 +0000"/>
                            <attachment id="179614" name="storage.bson" size="95" author="pablo.velasquez" created="Wed, 21 Feb 2018 02:43:40 +0000"/>
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