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    <title>MongoDB Jira</title>
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    <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>[SERVER-3034] Using NFS for data files (or journaling)</title>
                <link>https://jira.mongodb.org/browse/SERVER-3034</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;NFS data +  large updates causes a very &quot;spiky&quot; resident memory.&lt;/p&gt;

&lt;p&gt;When journaling is added, the problem is worse. The system seems to evacuate large amounts of data during updates. This results in a significant number page faults. This page faulting can slow down the updates dramatically.&lt;/p&gt;

&lt;p&gt;Two samples from mongostat running the same set of updates.&lt;br/&gt;
mongostat_nfs_journal.out:&lt;br/&gt;
update	flushes	mapped	vsize	res	faults	locked %idx miss %time&lt;br/&gt;
0	0	464m	1.08g	139m	0	90.1	0	18:21:44&lt;br/&gt;
0	0	464m	1.08g	286m	0	70.1	0	18:21:49&lt;br/&gt;
3126	0	464m	1.08g	37m	44	98.9	0	18:21:51&lt;br/&gt;
3836	0	464m	1.08g	49m	27	86.1	0	18:21:53&lt;br/&gt;
3801	0	464m	1.08g	62m	23	80.8	0	18:21:55&lt;br/&gt;
3952	0	464m	1.08g	65m	26	84.6	0	18:21:57&lt;br/&gt;
3685	0	464m	1.08g	75m	23	82.7	0	18:21:59&lt;br/&gt;
4027	0	464m	1.08g	88m	27	82.6	0	18:22:01&lt;/p&gt;

&lt;p&gt;mongostat_local_journal.out:&lt;br/&gt;
update	flushes	mapped	vsize	res	faults	locked %idx miss %time&lt;br/&gt;
0	0	464m	1.07g	162m	0	100	0	18:49:36&lt;br/&gt;
0	0	464m	1.07g	287m	0	41.4	0	18:49:40&lt;br/&gt;
4231	0	464m	1.07g	158m	0	113	0	18:49:42&lt;br/&gt;
4280	0	464m	1.07g	161m	0	84.4	0	18:49:44&lt;br/&gt;
4184	0	464m	1.07g	154m	0	80.7	0	18:49:46&lt;br/&gt;
4163	0	464m	1.07g	167m	0	86	0	18:49:48&lt;br/&gt;
4207	0	464m	1.07g	166m	0	92.5	0	18:49:50&lt;/p&gt;

&lt;p&gt;Observing lines 1,2,3 of each file:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Journaling+NFS: res goes from 139M to 286M to 37M&lt;/li&gt;
	&lt;li&gt;Journaling+local: res goes from 162M to 287M to 162M&lt;/li&gt;
	&lt;li&gt;Without journaling there are no jumps here&lt;/li&gt;
	&lt;li&gt;This machine has 8GBs of RAM, so there should not be a need to flush any memory&lt;/li&gt;
&lt;/ul&gt;
</description>
                <environment>Linux + NFS with data files &amp;amp; journal files stored on the NFS mount</environment>
        <key id="16576">SERVER-3034</key>
            <summary>Using NFS for data files (or journaling)</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</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="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="gatesvp">Gaetan Voyer-Perrault</reporter>
                        <labels>
                    </labels>
                <created>Mon, 2 May 2011 22:51:21 +0000</created>
                <updated>Thu, 3 Jul 2014 12:26:43 +0000</updated>
                            <resolved>Tue, 21 Jun 2011 15:08:55 +0000</resolved>
                                    <version>1.9.0</version>
                                                                        <votes>0</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="38496" author="redbeard0531" created="Tue, 21 Jun 2011 15:08:55 +0000"  >&lt;p&gt;Not much we can do here. Ticket created mostly to document effort in case this comes up again&lt;/p&gt;</comment>
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