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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[DOCS-7428] vmmemctl balloon driver update Production Notes</title>
                <link>https://jira.mongodb.org/browse/DOCS-7428</link>
                <project id="10380" key="DOCS">Documentation</project>
                    <description>&lt;p&gt;Hello.&lt;/p&gt;

&lt;p&gt;I am creating this ticket on behalf of &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=ricardo.lorenzo&quot; class=&quot;user-hover&quot; rel=&quot;ricardo.lorenzo&quot;&gt;ricardo.lorenzo&lt;/a&gt;, where an issue had been created using Rietveld to the &lt;tt&gt;production-notes.txt&lt;/tt&gt; file.&lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;&lt;tt&gt;ricardo.lorenzo 2016/01/26 15:53:42&lt;/tt&gt;&lt;br/&gt;
The memory reclamation when the hypervisor is overcommitting caused the memory&lt;br/&gt;
to be ballooned from a VM using a balloon driver residing inside the guest OS.&lt;br/&gt;
When the balloon driver expands, it may induce the guest OS to reclaim memory&lt;br/&gt;
from guest applications.&lt;/p&gt;

&lt;p&gt;Disabling the balloon driver can cause the hypervisor to use its swap as there&lt;br/&gt;
is no other mechanism to perform the memory reclamation. Instead of doing that,&lt;br/&gt;
we suggest to map and reserve the full amount of memory for the VM running&lt;br/&gt;
MongoDB in order to avoid the balloon to be inflated in the local OS if there is&lt;br/&gt;
a memory pressure in the hypervisor due to an overcommitted configuration.&lt;/p&gt;

&lt;p&gt;The CPU reservation also shouldn&apos;t exceed more than 2 virtual CPU per physical&lt;br/&gt;
core.&lt;/p&gt;

&lt;p&gt;We also recommend disabling the VM live relocation configuring proper exceptions&lt;br/&gt;
in the Distributed Resource Scheduler. The live motion of the VM can cause&lt;br/&gt;
different performance problems and it will be difficult for the HA mechanisms to&lt;br/&gt;
be triggered as the VM is not in a faulty stage.&lt;/p&gt;

&lt;p&gt;It is possible to clone a virtual machine running MongoDB.&lt;br/&gt;
You might use this function to spin up a new virtual host to add as a member of&lt;br/&gt;
a replica set. If you clone a VM with journaling enabled, the clone snapshot&lt;br/&gt;
will be valid. If not using journaling, first stop :program:`mongod`, then clone&lt;br/&gt;
the VM, and finally, restart :program:`mongod`.&lt;/p&gt;


&lt;p&gt;KVM&lt;br/&gt;
```&lt;/p&gt;

&lt;p&gt;The same recommendation from VMware applies for Memory and CPU overcommitment.&lt;/p&gt;&lt;/blockquote&gt;</description>
                <environment></environment>
        <key id="272629">DOCS-7428</key>
            <summary>vmmemctl balloon driver update Production Notes</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="3">Duplicate</resolution>
                                        <assignee username="allison.moore@mongodb.com">Allison Reinheimer Moore</assignee>
                                    <reporter username="byron.grogan">Byron Grogan</reporter>
                        <labels>
                    </labels>
                <created>Tue, 15 Mar 2016 16:54:02 +0000</created>
                <updated>Wed, 11 Jan 2017 21:49:16 +0000</updated>
                            <resolved>Tue, 15 Mar 2016 17:05:10 +0000</resolved>
                                                    <fixVersion>01112017-cleanup</fixVersion>
                                    <component>manual</component>
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