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    <title>MongoDB Jira</title>
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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-4689] When Journaling is Activated - I/O spike occurs on NFS filer and VM</title>
                <link>https://jira.mongodb.org/browse/SERVER-4689</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;When journaling activated in our replica sets, the MongoDB servers generate out of the ordinary I/O. This causes I/O wait to spike and the number of IOPS on our filerhead to grow rapidly.&lt;/p&gt;</description>
                <environment>Linux, Netapp, WAFL Filesystem</environment>
        <key id="28396">SERVER-4689</key>
            <summary>When Journaling is Activated - I/O spike occurs on NFS filer and VM</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="4">Incomplete</resolution>
                                        <assignee username="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="wirelessmatrix">Wireless Matrix (SOC)</reporter>
                        <labels>
                    </labels>
                <created>Mon, 16 Jan 2012 16:46:13 +0000</created>
                <updated>Tue, 29 Oct 2013 15:23:18 +0000</updated>
                            <resolved>Fri, 20 Jan 2012 22:55:11 +0000</resolved>
                                    <version>1.8.0</version>
                                                    <component>Storage</component>
                                        <votes>1</votes>
                                    <watches>4</watches>
                                                                                                                <comments>
                            <comment id="81380" author="redbeard0531" created="Fri, 20 Jan 2012 22:55:11 +0000"  >&lt;p&gt;This will get folded into our broader effort to better support NFS.&lt;/p&gt;</comment>
                            <comment id="81275" author="wirelessmatrix" created="Fri, 20 Jan 2012 17:04:33 +0000"  >&lt;p&gt;You can close this ticket, but please ensure that this is on your product roadmap, as we know more and more companies are using NFS datastores in conjunction with MongoDB.&lt;/p&gt;</comment>
                            <comment id="81274" author="redbeard0531" created="Fri, 20 Jan 2012 16:58:01 +0000"  >&lt;p&gt;Do you need any more info or can I close this ticket out?&lt;/p&gt;</comment>
                            <comment id="80595" author="redbeard0531" created="Wed, 18 Jan 2012 00:26:55 +0000"  >&lt;p&gt;It&apos;s not, that was a separate issue relating to allocating datafiles.&lt;/p&gt;

&lt;p&gt;I remember that we ran into this while testing this a while ago. IIRC, my theory at the time was that linux had different behavior for private mmaps backed by nfs than for either privated disk-backed mmaps or shared nfs mmaps.&lt;/p&gt;

&lt;p&gt;The current recommendation is to use iSCSI or local storage (better) for mongod servers rather than nfs. We are currently working to improve the performance on nfs, but that will only apply to the 2.2 release and will not be backported to the 1.8 series.&lt;/p&gt;

&lt;p&gt;PS - On a related note, I would suggest upgrading to (at least) the latest 1.8 release as there have been some important bugs fixed since 1.8.0.&lt;/p&gt;</comment>
                            <comment id="80139" author="eliot" created="Mon, 16 Jan 2012 18:25:43 +0000"  >&lt;p&gt;Might be related to &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-4652&quot; title=&quot;Don&amp;#39;t use fallocate on NFS&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-4652&quot;&gt;&lt;del&gt;SERVER-4652&lt;/del&gt;&lt;/a&gt;	&lt;/p&gt;</comment>
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            <issuekey id="34881">SERVER-5429</issuekey>
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