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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-3207] MMS Sizing Documentation Misleading</title>
                <link>https://jira.mongodb.org/browse/DOCS-3207</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;&lt;a href=&quot;http://mms.mongodb.com/help-hosted/v1.4/management/tutorial/prepare-backing-mongodb-instances/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://mms.mongodb.com/help-hosted/v1.4/management/tutorial/prepare-backing-mongodb-instances/&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;The section describing blockstore sizing seems to be omitting key factors such as garbage collection and de-duplication. Also, the example seems to be assuming an insert only workload which is that if you are adding 8GB of oplog a day you are adding ~8GB of data. &lt;/p&gt;

&lt;p&gt;In particular the section that sparks the most confusion below is where the formula is introduced. &lt;/p&gt;

&lt;p&gt;&quot;Using the four shard, 200GB per shard cluster example from above, also add 2GB/day of oplogs generated per shard or 8GB/day total across the cluster.&lt;/p&gt;

&lt;p&gt;If the longest stored snapshot has a one year retention period, the approximate amount of data in the blockstore will be 800GB + (8GB * 365 days) or 3720GB. If the data gets a 4:1 compression ratio, which is an average seen in the hosted MMS, the blockstore space required will actually be 930GB.&quot;&lt;/p&gt;

&lt;p&gt;This is calculating the approximate size of one snapshot, which is a somewhat useless metric because depending on deduplication values/number of snapshots this will vary. The statement below it that is correct seems to directly contradict it and doesn&apos;t tie in with the example or information provided above.&lt;/p&gt;

&lt;p&gt;&quot;Based on looking at the MMS hosted service, a good rule of thumb is a replica set will take up 2x - 3x its size in the Blockstore.&quot;&lt;/p&gt;

&lt;p&gt;Can this section be clarified? &lt;/p&gt;</description>
                <environment></environment>
        <key id="131861">DOCS-3207</key>
            <summary>MMS Sizing Documentation Misleading</summary>
                <type id="3" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14718&amp;avatarType=issuetype">Task</type>
                                            <priority id="2" iconUrl="https://jira.mongodb.org/images/icons/priorities/critical.svg">Critical - P2</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="osmar.olivo">Osmar Olivo</reporter>
                        <labels>
                    </labels>
                <created>Thu, 17 Apr 2014 19:44:29 +0000</created>
                <updated>Tue, 2 Sep 2014 23:09:18 +0000</updated>
                            <resolved>Mon, 21 Apr 2014 19:41:15 +0000</resolved>
                                    <version>v1.3.4</version>
                    <version>mms-1.4</version>
                                    <fixVersion>v1.3.4</fixVersion>
                    <fixVersion>mms-1.4</fixVersion>
                                    <component>Cloud Manager</component>
                        <due></due>
                            <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="709816" author="xgen-internal-githook" created="Tue, 2 Sep 2014 23:09:18 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;tychoish&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-3207&quot; title=&quot;MMS Sizing Documentation Misleading&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-3207&quot;&gt;&lt;del&gt;DOCS-3207&lt;/del&gt;&lt;/a&gt;: sizing guide improvements&lt;br/&gt;
Branch: next&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mms-docs/commit/e6e398eac40dc7b34824ad0a4fe36f9ecea29f13&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mms-docs/commit/e6e398eac40dc7b34824ad0a4fe36f9ecea29f13&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="558064" author="xgen-internal-githook" created="Mon, 21 Apr 2014 21:23:06 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;tychoish&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-3207&quot; title=&quot;MMS Sizing Documentation Misleading&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-3207&quot;&gt;&lt;del&gt;DOCS-3207&lt;/del&gt;&lt;/a&gt;: sizing guide improvements&lt;br/&gt;
Branch: v1.4&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mms-docs/commit/3d934c1a16d0381b39979a48a4c202c216070539&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mms-docs/commit/3d934c1a16d0381b39979a48a4c202c216070539&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="557912" author="samk" created="Mon, 21 Apr 2014 19:41:15 +0000"  >&lt;p&gt;fix should go out later today or early tomorrow.&lt;/p&gt;</comment>
                            <comment id="554844" author="xgen-internal-githook" created="Fri, 18 Apr 2014 17:52:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;tychoish&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-3207&quot; title=&quot;MMS Sizing Documentation Misleading&quot; class=&quot;issue-link&quot; data-issue-key=&quot;DOCS-3207&quot;&gt;&lt;del&gt;DOCS-3207&lt;/del&gt;&lt;/a&gt;: sizing guide improvements&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/10gen/mms-docs/commit/e6e398eac40dc7b34824ad0a4fe36f9ecea29f13&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/10gen/mms-docs/commit/e6e398eac40dc7b34824ad0a4fe36f9ecea29f13&lt;/a&gt;&lt;/p&gt;</comment>
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