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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-12174] Clarify how much down time is needed for iterative rsync approach to initial sync</title>
                <link>https://jira.mongodb.org/browse/DOCS-12174</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;h2&gt;&lt;a name=&quot;Description&quot;&gt;&lt;/a&gt;Description&lt;/h2&gt;
&lt;p&gt;Our &lt;a href=&quot;https://docs.mongodb.com/manual/core/backups/#back-up-with-cp-or-rsync&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;docs&lt;/a&gt; currently state:&lt;/p&gt;


&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&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;  margin-top: 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;Back Up with cp or rsync&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&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;If your storage system does not support snapshots, you can copy the files directly using cp, rsync, or a similar tool. Since copying multiple files is not an atomic operation, you must stop all writes to the mongod before copying the files. Otherwise, you will copy the files in an invalid state.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
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&lt;p/&gt;

&lt;p&gt;However, the procedure for rsync does not need to include downtime for the duration of the initial sync if we use an iterative rsync process e.g.: &lt;/p&gt;

&lt;p&gt;1. Shut down target node&lt;br/&gt;
2. run rsync against a secondary in the replica set while it is live&lt;br/&gt;
3. repeat step 2 multiple times until the time to complete the rsync process is much smaller than your oplog window&lt;br/&gt;
4. run db.fsyncLock on the sync source being used&lt;br/&gt;
5. run rsync one last time - this will be fast&lt;br/&gt;
6. run db.fsyncUnlock on sync source&lt;br/&gt;
7. startup target node - it will sync with any new updates that occurred after the db.fsyncLock.  This will be very quick.&lt;/p&gt;

&lt;p&gt;A sample rsync command should be included in the docs e.g.:&lt;/p&gt;

&lt;p&gt;rsync -avKkz --progress --del root@hostname-of-sync-source:/opt/mongo/ /opt/mongo/&lt;/p&gt;




&lt;h2&gt;&lt;a name=&quot;Scopeofchanges&quot;&gt;&lt;/a&gt;Scope of changes&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;ImpacttoOtherDocs&quot;&gt;&lt;/a&gt;Impact to Other Docs&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;MVP%28WorkandDate%29&quot;&gt;&lt;/a&gt;MVP (Work and Date)&lt;/h2&gt;

&lt;h2&gt;&lt;a name=&quot;Resources%28ScopeorDesignDocs%2CInvision%2Cetc.%29&quot;&gt;&lt;/a&gt;Resources (Scope or Design Docs, Invision, etc.)&lt;/h2&gt;
</description>
                <environment></environment>
        <key id="627898">DOCS-12174</key>
            <summary>Clarify how much down time is needed for iterative rsync approach to initial sync</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="arnie.listhaus@mongodb.com">Arnie Listhaus</reporter>
                        <labels>
                    </labels>
                <created>Thu, 1 Nov 2018 21:31:30 +0000</created>
                <updated>Mon, 30 Oct 2023 20:51:43 +0000</updated>
                            <resolved>Mon, 13 Mar 2023 19:39:26 +0000</resolved>
                                                    <fixVersion>Server_Docs_20231030</fixVersion>
                                    <component>Server</component>
                        <due></due>
                            <votes>2</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="5268883" author="JIRAUSER1264464" created="Mon, 13 Mar 2023 19:39:26 +0000"  >&lt;p&gt;Hi, we&apos;re closing this ticket because the discussion appears to invalidate the ask. If you believe this is an error, please reopen the ticket with a comment explaining why and we&apos;ll take a look. Thanks!&lt;/p&gt;</comment>
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