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        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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            <title>[SERVER-3214] Number of Config Servers</title>
                <link>https://jira.mongodb.org/browse/SERVER-3214</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Regarding the number of config servers documentation only talks about maximum 3 config server.&lt;br/&gt;
Can we have more than three? &lt;br/&gt;
If not why?&lt;/p&gt;

&lt;p&gt;If yes, does that disable chunk management if one goes offline?&lt;br/&gt;
We have 2 data centers and want to hae 3 in each place.&lt;/p&gt;</description>
                <environment></environment>
        <key id="17997">SERVER-3214</key>
            <summary>Number of Config Servers</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="dave.michaud@monster.com">Dave Michaud</reporter>
                        <labels>
                    </labels>
                <created>Tue, 7 Jun 2011 16:38:37 +0000</created>
                <updated>Thu, 8 Dec 2011 03:53:31 +0000</updated>
                            <resolved>Wed, 8 Jun 2011 05:21:11 +0000</resolved>
                                    <version>1.8.0</version>
                                                    <component>Admin</component>
                                        <votes>0</votes>
                                    <watches>2</watches>
                                                                                                                <comments>
                            <comment id="71617" author="wedge@badgeville.com" created="Thu, 8 Dec 2011 03:53:31 +0000"  >&lt;p&gt;What happens if you bring up another config server and you already have 3?   Will it break anything?  We&apos;re just trying to migrate config servers over to other systems, and want to do it without downtime.&lt;/p&gt;
</comment>
                            <comment id="36624" author="eliot" created="Wed, 8 Jun 2011 05:21:11 +0000"  >&lt;p&gt;You can only have 3 right now.&lt;br/&gt;
The main reason is that all writes are down with a 2 phase commit, and doing that on more than 3 is very expensive.  &lt;/p&gt;

&lt;p&gt;We&apos;ve talked about using a replica set for the config servers, but unclear where we&apos;ll go.  See &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-1448&quot; title=&quot;Host sharding config data on a replica set&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-1448&quot;&gt;&lt;del&gt;SERVER-1448&lt;/del&gt;&lt;/a&gt; &lt;/p&gt;</comment>
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