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        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-5143] Recommendations and requirements for running a blockstore on a sharded cluster</title>
                <link>https://jira.mongodb.org/browse/DOCS-5143</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;MMS will pre-split chunks and distributed them evenly across shards before any data is inserted.&lt;/li&gt;
	&lt;li&gt;The balancer should be off. The user is responsible for this. Having the balancer on will prevent Grooms from running. It will also result in potentially unnecessary chunk moves.&lt;/li&gt;
	&lt;li&gt;Inevitably the balancer may need to be turned on from time to time if new shards are added or shards become unbalanced (unlikely, but possible). This is okay, as long as it&apos;s noted that Grooms sourced from this blockstore will not be able to run during this time.&lt;/li&gt;
&lt;/ul&gt;
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        <key id="193258">DOCS-5143</key>
            <summary>Recommendations and requirements for running a blockstore on a sharded cluster</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="2">Won&apos;t Fix</resolution>
                                        <assignee username="tony.sansone@mongodb.com">Anthony Sansone</assignee>
                                    <reporter username="bgrabar">Bob Grabar</reporter>
                        <labels>
                    </labels>
                <created>Tue, 31 Mar 2015 20:46:27 +0000</created>
                <updated>Wed, 11 Jan 2017 22:35:30 +0000</updated>
                            <resolved>Wed, 27 Jul 2016 18:07:22 +0000</resolved>
                                                    <fixVersion>01112017-cleanup</fixVersion>
                                    <component>Ops Manager</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="1338151" author="emily.hall" created="Wed, 27 Jul 2016 18:07:22 +0000"  >&lt;p&gt;Closed for housekeeping on 7/27/2016 by Emily Hall. &lt;br/&gt;
If you require additional support, please open a new ticket for prioritization. &lt;br/&gt;
Thanks,&lt;br/&gt;
Emily&lt;/p&gt;</comment>
                            <comment id="907509" author="steve.briskin@10gen.com" created="Thu, 7 May 2015 13:52:50 +0000"  >&lt;p&gt;We have decided to not offer sharded blockstores in on-prem 1.8 and let them bake a bit more in cloud.  Ops manager 1.8 will come with it disabled by default (MMSP-7090).  We can use this ticket to track all requirements and recommendations for a sharded blockstore for 2.0.&lt;/p&gt;

&lt;p&gt;MMS will pre-split chunks and distributed them evenly across shards before any data is inserted.&lt;br/&gt;
The balancer should be off.  The user is responsible for this.  Having the balancer on will prevent Grooms from running.  It will also result in potentially unnecessary chunk moves.&lt;br/&gt;
Inevitably the balancer may need to be turned on from time to time if new shards are added or shards become unbalanced (unlikely, but possible).  This is okay, as long as it&apos;s noted that Grooms sourced from this blockstore will not be able to run during this time.&lt;/p&gt;</comment>
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