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    <title>MongoDB Jira</title>
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    <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-11927] Backup of config server should be updated for CSRS</title>
                <link>https://jira.mongodb.org/browse/DOCS-11927</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;----------------------------&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;OriginalDescription&quot;&gt;&lt;/a&gt;Original Description&lt;/h2&gt;

&lt;p&gt;Documentation at &lt;a href=&quot;https://docs.mongodb.com/manual/tutorial/backup-sharded-cluster-metadata/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://docs.mongodb.com/manual/tutorial/backup-sharded-cluster-metadata/&lt;/a&gt; states the following:&lt;/p&gt;

&lt;blockquote&gt;&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;1&amp;#93;&lt;/span&gt;	While one of the three config servers is unavailable, the cluster cannot split any chunks nor can it migrate chunks between shards. Your application will be able to write data to the cluster. See Config Servers for more information.&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;The above is true for SCCC only. For CSRS, writes to the config server would still occur as long as there&apos;s a majority of data bearing nodes available.&lt;/p&gt;

&lt;p&gt;I suggest two alternatives for CSRS specific documentation, depending on the user requirement:&lt;/p&gt;
&lt;ul&gt;
	&lt;li&gt;If the goal is to simply get a backup of the config server (regardless of possible replication lag or writes happening on the cluster), then just remove the paragraph that I quoted. I would also argue that it is not required to disable the balancer, as we want the backup to only to be consistent at the filesystem level.&lt;/li&gt;
	&lt;li&gt;If the goal is to back up the metadata at a specific point in time and/or to ensure consistency at the CSRS replica set level, then we should make a majority of CSRS members unavailable, and take the backup on the member that was &lt;em&gt;last&lt;/em&gt; made unavailable.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;IMO the second goal can be achieved by either shutting down a majority of nodes, or via fsynlock().&lt;/p&gt;

&lt;p&gt;----------------------------&lt;/p&gt;
&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Scopeofchanges%28filesthatneedworkandhowmuch%29&quot;&gt;&lt;/a&gt;Scope of changes (files that need work and how much)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Impacttootherdocsoutsideofthisproduct&quot;&gt;&lt;/a&gt;Impact to other docs outside of this product&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28workanddate%3F%29&quot;&gt;&lt;/a&gt;MVP (work and date?)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28e.g.ScopeDocs%2CInvision%29&quot;&gt;&lt;/a&gt;Resources (e.g. Scope Docs, Invision)&lt;/h2&gt;</description>
                <environment>&lt;a href=&quot;ttps://docs.mongodb.com/manual/tutorial/backup-sharded-cluster-metadata/&quot;&gt;ttps://docs.mongodb.com/manual/tutorial/backup-sharded-cluster-metadata/&lt;/a&gt;</environment>
        <key id="580236">DOCS-11927</key>
            <summary>Backup of config server should be updated for CSRS</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</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="kay.kim@mongodb.com">Kay Kim</assignee>
                                    <reporter username="josef.ahmad@mongodb.com">Josef Ahmad</reporter>
                        <labels>
                            <label>csrsupgrade</label>
                    </labels>
                <created>Tue, 31 Jul 2018 12:47:15 +0000</created>
                <updated>Mon, 30 Oct 2023 20:56:49 +0000</updated>
                                                            <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>manual</component>
                    <component>Server</component>
                        <due></due>
                            <votes>1</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="4940571" author="edu.bot" created="Mon, 31 Oct 2022 16:07:35 +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>
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