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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-402] Sizing considerations for cluster</title>
                <link>https://jira.mongodb.org/browse/DOCS-402</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;I am currently working on sizing a mongodb cluster. I am taking into the following considerations for sizing. Please let me know if i missed any:&lt;/p&gt;

&lt;p&gt;1) Anticipated Size of the data(Number of documents * Size of documents * Number of users)&lt;br/&gt;
2) Expected size of data to be replicated&lt;br/&gt;
3) Size of Indexes(for each collection,5% of data size if default &quot;_id&quot; index, 5% for each additional index on each collection)&lt;br/&gt;
4) Size of the working set(to determine size of RAM)&lt;br/&gt;
5) Data archival requirements&lt;/p&gt;

&lt;p&gt;Let me know if there are additional things i need to consider.&lt;/p&gt;

&lt;p&gt;Also, is there a guideline on the number of shards to be designed for a cluster?&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Yash&lt;/p&gt;</description>
                <environment></environment>
        <key id="47165">DOCS-402</key>
            <summary>Sizing considerations for 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>
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                                    <resolution id="9">Done</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="yash.badiani@cignex.com">Yash Badiani</reporter>
                        <labels>
                    </labels>
                <created>Wed, 15 Aug 2012 02:03:34 +0000</created>
                <updated>Mon, 15 Nov 2021 15:44:33 +0000</updated>
                            <resolved>Wed, 15 Aug 2012 02:54:28 +0000</resolved>
                                                                        <due></due>
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                                                                                                                <comments>
                            <comment id="153483" author="samk" created="Wed, 15 Aug 2012 03:03:35 +0000"  >&lt;p&gt;Thanks, I think the google group will provide a more thorough answer to your question. Additional things to consider: &lt;/p&gt;

&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;MongoDB also uses some &quot;padding&quot; that increases storage requirements to support documents that grow after creation.&lt;/li&gt;
&lt;/ul&gt;


&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;The size of indexes is more variable, but that depends on the size of the keys.&lt;/li&gt;
&lt;/ul&gt;


&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;In general you can have anywhere from 2 shards to a few hundred. I&apos;m not aware of any deployments larger than that at the moment, but there&apos;s no reason that there couldn&apos;t be more than that. Basically as many as you need.&lt;/li&gt;
&lt;/ul&gt;


&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;The main sizing recommendation for shards is: ensure that you&apos;re, at any moment, using something less than 80% or so of total capacity (write capacity, storage capacity, etc.) Basically it takes some amount of time and system resource for the cluster to redistribute data (i.e. to &quot;balance&quot;) when you add a new shard and if you wait too long to add capacity, it may be difficult or effectively impossible to reach balance without some kind of downtime.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Hope this helps! &lt;/p&gt;</comment>
                            <comment id="153473" author="yash.badiani@cignex.com" created="Wed, 15 Aug 2012 02:10:13 +0000"  >&lt;p&gt;Will add this to the google group as this is more of a query and not a bug. Sorry for that.&lt;/p&gt;</comment>
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