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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>[DOCS-1042] &quot;Use Filesystem Snapshots to Backup and Restore&quot; documentation is error-ridden and misguided</title>
                <link>https://jira.mongodb.org/browse/DOCS-1042</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Lots of issues here. My colleague has been working on this approach and it&apos;s made for a pretty lousy week for him. He might be able to provide more details, but to start:&lt;/p&gt;

&lt;ul&gt;
	&lt;li&gt;Using tar with a raw device makes no sense&lt;/li&gt;
	&lt;li&gt;Docs should note that the lvm block-level dumps don&apos;t allow for incrementals&lt;/li&gt;
	&lt;li&gt;Wouldn&apos;t it make more sense to take a snapshot, mount it, and tar the files instead of doing the block-level dump/restore?&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment></environment>
        <key id="63263">DOCS-1042</key>
            <summary>&quot;Use Filesystem Snapshots to Backup and Restore&quot; documentation is error-ridden and misguided</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="9">Done</resolution>
                                        <assignee username="sam.kleinman">Sam Kleinman</assignee>
                                    <reporter username="peter.burkholder@audaxhealth.com">Peter Burkholder</reporter>
                        <labels>
                    </labels>
                <created>Fri, 25 Jan 2013 15:32:42 +0000</created>
                <updated>Thu, 21 Feb 2013 23:25:13 +0000</updated>
                            <resolved>Thu, 21 Feb 2013 23:25:13 +0000</resolved>
                                                                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="272596" author="auto" created="Thu, 21 Feb 2013 23:25:03 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;date&apos;: u&apos;2013-02-21T23:24:56Z&apos;, u&apos;name&apos;: u&apos;Sam Kleinman&apos;, u&apos;email&apos;: u&apos;samk@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-1042&quot; title=&quot;&amp;quot;Use Filesystem Snapshots to Backup and Restore&amp;quot; documentation is error-ridden and misguided&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-1042&quot;&gt;&lt;del&gt;DOCS-1042&lt;/del&gt;&lt;/a&gt; and &lt;a href=&quot;https://jira.mongodb.org/browse/DOCS-935&quot; title=&quot;Snapshot Compression Method Clarification&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-935&quot;&gt;&lt;del&gt;DOCS-935&lt;/del&gt;&lt;/a&gt; backup system clarifications and improvements&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/docs/commit/d5c7080aefb0ce15cc3bc603004de2e724f4f6ef&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/docs/commit/d5c7080aefb0ce15cc3bc603004de2e724f4f6ef&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="249677" author="samk" created="Fri, 25 Jan 2013 16:05:22 +0000"  >&lt;p&gt;Thanks for pointing this out. We totally agree that the backup documentation needs some work, particularly the section that you point out. I look forward to hearing your colleague&apos;s feedback, and incorporating improvements as needed. For the moment: &lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Agreed about &lt;tt&gt;tar&lt;/tt&gt; I&apos;ve meant to replace it with &lt;tt&gt;gzip&lt;/tt&gt; for a couple of weeks, but haven&apos;t had the time to do the proper testing. In the mean time, while &lt;tt&gt;tar&lt;/tt&gt; doesn&apos;t make sense, it&apos;s not harmful to use &lt;tt&gt;tar&lt;/tt&gt;.&lt;/li&gt;
&lt;/ul&gt;


&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;That&apos;s fair. It&apos;s also the case that &lt;b&gt;none&lt;/b&gt; of our documented backup methods will produce incremental backups as such. I can imagine building a backup system that provides something more incremental, either using &lt;tt&gt;rdiff-backup&lt;/tt&gt; to export data from snapshots, or just storing snapshot/mongodump output in a deduplicating filesystem should do the trick.&lt;/li&gt;
&lt;/ul&gt;


&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;That&apos;s definitely a valid approach, and I think that we should include a note about this possibility.  My reasoning for the current procedure is to minimize overhead on the host that&apos;s still running a production &lt;tt&gt;mongod&lt;/tt&gt; as well as the overall time of the backup procedure. Compressing the entire filesystem may improve recovery times, and given the compression I wouldn&apos;t expect the size difference to be large (assuming that the &lt;tt&gt;dbpath&lt;/tt&gt; was the entirety of the file system. If this doesn&apos;t match your experience, I&apos;d be happy to add notes to this effect.&lt;/li&gt;
&lt;/ul&gt;
</comment>
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