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<channel>
    <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>
    </build-info>


<item>
            <title>[SERVER-44834] mongod block some time,  dirty is very high, and do not evit data to disk&#65292; io is 0%, my disk is nvme-SSD(this disk io performance is very good)</title>
                <link>https://jira.mongodb.org/browse/SERVER-44834</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;mongod block some time, dirty is very high, and do not evit data to disk&#65292; io is 0%&lt;/p&gt;

&lt;p&gt;dirty is very high, but do not evit to disk, disk io is 0%&lt;/p&gt;

&lt;p&gt;mongostat info as following:&lt;/p&gt;
&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;insert query update delete getmore command dirty used flushes vsize  res qrw arw net_in net_out conn                time&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 11|0 21.7% 95.0% 0 117G 55.9G n/a 0|0 1|1 1.57k 69.1k 1823 shard_4FC5EC6E PRI Nov 22 12:17:51.561&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 6|0 21.5% 95.0% 0 117G 55.9G n/a 0|0 1|1 1.09k 74.3k 1823 shard_4FC5EC6E PRI Nov 22 12:17:52.505&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 5|0 21.3% 95.0% 0 117G 55.9G n/a 0|0 1|1 1.03k 69.9k 1823 shard_4FC5EC6E PRI Nov 22 12:17:53.506&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 7|0 29.7% 95.0% 0 117G 55.9G n/a 0|0 2|1 1.25k 70.4k 1823 shard_4FC5EC6E PRI Nov 22 12:17:54.506&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 8|0 48.5% 95.0% 0 117G 55.9G n/a 0|0 2|1 1.59k 71.9k 1823 shard_4FC5EC6E PRI Nov 22 12:17:55.505&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 3 *0 0 5|0 58.1% 95.0% 0 117G 55.9G n/a 0|0 2|23 26.4k 69.9k 1823 shard_4FC5EC6E PRI Nov 22 12:17:56.507&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 22 *0 0 60|0 57.5% 95.0% 0 117G 55.9G n/a 0|411 2|128 80.3k 39.2k 1944 shard_4FC5EC6E PRI Nov 22 12:18:04.579&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 561 *0 0 1509|0 56.3% 94.1% 0 118G 56.0G n/a 0|691 2|128 607k 3.66m 1944 shard_4FC5EC6E PRI Nov 22 12:18:05.679&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 10|0 55.7% 94.0% 0 118G 56.0G n/a 0|691 1|128 1.31k 80.0k 1944 shard_4FC5EC6E PRI Nov 22 12:18:06.559&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 11|0 55.0% 93.9% 0 118G 56.0G n/a 0|691 1|128 2.56k 78.7k 1944 shard_4FC5EC6E PRI Nov 22 12:18:07.509&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 8|0 54.7% 93.8% 0 118G 56.0G n/a 0|691 1|128 2.56k 71.1k 1944 shard_4FC5EC6E PRI Nov 22 12:18:08.507&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 8|0 54.2% 93.3% 0 118G 56.0G n/a 0|691 1|128 2.56k 71.1k 1944 shard_4FC5EC6E PRI Nov 22 12:18:09.507&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 10|0 54.2% 93.3% 0 118G 56.0G n/a 0|691 1|128 2.67k 73.0k 1944 shard_4FC5EC6E PRI Nov 22 12:18:10.506&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 26|0 54.2% 93.3% 0 118G 56.0G n/a 0|691 2|128 7.85k 88.5k 1944 shard_4FC5EC6E PRI Nov 22 12:18:11.507&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 9|0 54.2% 93.3% 0 118G 56.0G n/a 0|691 1|128 2.84k 72.0k 1944 shard_4FC5EC6E PRI Nov 22 12:18:12.506&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 7|0 54.2% 93.2% 0 118G 56.0G n/a 0|691 1|128 2.55k 70.9k 1944 shard_4FC5EC6E PRI Nov 22 12:18:13.508&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 8|0 54.3% 93.2% 0 118G 56.0G n/a 0|691 1|128 2.56k 71.1k 1944 shard_4FC5EC6E PRI Nov 22 12:18:14.506&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 6|0 54.3% 93.2% 0 118G 55.9G n/a 0|691 1|128 1.03k 70.1k 1944 shard_4FC5EC6E PRI Nov 22 12:18:15.506&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 8|0 54.0% 92.9% 0 118G 55.9G n/a 0|691 1|128 2.77k 71.3k 1944 shard_4FC5EC6E PRI Nov 22 12:18:16.507&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 7|0 52.9% 91.9% 0 118G 55.9G n/a 0|691 1|128 2.55k 71.0k 1944 shard_4FC5EC6E PRI Nov 22 12:18:17.507&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 8|0 51.7% 91.1% 0 118G 55.9G n/a 0|691 1|128 1.59k 71.9k 1943 shard_4FC5EC6E PRI Nov 22 12:18:18.507&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 10|0 50.6% 90.2% 0 118G 55.9G n/a 0|691 1|128 1.58k 71.6k 1943 shard_4FC5EC6E PRI Nov 22 12:18:19.517&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 6|0 49.5% 89.6% 0 118G 55.9G n/a 0|691 1|128 1.04k 70.8k 1943 shard_4FC5EC6E PRI Nov 22 12:18:20.506&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 11|0 48.8% 89.3% 0 118G 55.9G n/a 0|691 1|128 1.60k 70.5k 1943 shard_4FC5EC6E PRI Nov 22 12:18:21.537&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 6|0 48.4% 89.2% 0 118G 55.9G n/a 0|691 1|128 1.06k 72.2k 1943 shard_4FC5EC6E PRI Nov 22 12:18:22.507&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;10.37.162.223:10000 *0 *0 *0 *0 0 5|0 47.9% 89.1% 0 118G 55.9G n/a 0|691 1|128 1.03k 70.0k 1943 shard_4FC5EC6E PRI Nov 22 12:18:23.507&lt;/span&gt;&lt;/pre&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;</description>
                <environment></environment>
        <key id="1025452">SERVER-44834</key>
            <summary>mongod block some time,  dirty is very high, and do not evit data to disk&#65292; io is 0%, my disk is nvme-SSD(this disk io performance is very good)</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="13204">Community Answered</resolution>
                                        <assignee username="dmitry.agranat@mongodb.com">Dmitry Agranat</assignee>
                                    <reporter username="1147952115@qq.com">y yz</reporter>
                        <labels>
                    </labels>
                <created>Tue, 26 Nov 2019 03:43:09 +0000</created>
                <updated>Fri, 27 Oct 2023 15:56:38 +0000</updated>
                            <resolved>Mon, 2 Dec 2019 13:48:53 +0000</resolved>
                                    <version>3.6.14</version>
                    <version>3.6.15</version>
                                                    <component>Performance</component>
                    <component>Replication</component>
                                        <votes>0</votes>
                                    <watches>6</watches>
                                                                                                                <comments>
                            <comment id="2576062" author="1147952115@qq.com" created="Tue, 3 Dec 2019 02:42:37 +0000"  >&lt;p&gt;@Dmitry Agranat&lt;br/&gt;
thanks very much.&lt;/p&gt;</comment>
                            <comment id="2574394" author="dmitry.agranat" created="Mon, 2 Dec 2019 13:48:11 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=1147952115%40qq.com&quot; class=&quot;user-hover&quot; rel=&quot;1147952115@qq.com&quot;&gt;1147952115@qq.com&lt;/a&gt;, &lt;/p&gt;

&lt;blockquote&gt;
&lt;p&gt;the master disk performance is very good, why the dirty-percentage is become higher and higher, and all the client connect blocked&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;There are 2 reasons for this:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Secondaries do not keep up replicating data from the primary (which has much faster disks)&lt;/li&gt;
	&lt;li&gt;When one of the secondaries becomes unavailable, even for a few seconds, we must keep historical data on the primary. This creates cache pressure (dirty percentage becomes high) which in turn impacts client&apos;s performance.&lt;/li&gt;
&lt;/ul&gt;


&lt;blockquote&gt;
&lt;p&gt;How can I solve this problem&#65292;What should I do&lt;/p&gt;&lt;/blockquote&gt;

&lt;p&gt;There are a few things which might help:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Make sure to follow our &lt;a href=&quot;https://docs.mongodb.com/manual/administration/production-notes/index.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Production Notes&lt;/a&gt;&lt;/li&gt;
	&lt;li&gt;Make sure HW between all members is identical&lt;/li&gt;
	&lt;li&gt;Consider using PSS instead of PSSA&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;I am going to close this ticket now but if you still experience issues after implementing all the above recommendations, please open a new one and we&apos;ll be happy to have a look.&lt;/p&gt;

&lt;p&gt;Regards,&lt;br/&gt;
Dima&lt;/p&gt;
</comment>
                            <comment id="2574355" author="1147952115@qq.com" created="Mon, 2 Dec 2019 13:24:22 +0000"  >&lt;p&gt;@Dmitry Agranat&lt;br/&gt;
thanks for you reply, but I have one problem, the master disk performance is very good, why the dirty-percentage is become higher and higher, and all the client connect blocked?&lt;/p&gt;

&lt;p&gt;another question, How can I solve this problem&#65292; What should I do&lt;/p&gt;

&lt;p&gt;thanks again.&lt;/p&gt;</comment>
                            <comment id="2574189" author="dmitry.agranat" created="Mon, 2 Dec 2019 10:15:17 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=1147952115%40qq.com&quot; class=&quot;user-hover&quot; rel=&quot;1147952115@qq.com&quot;&gt;1147952115@qq.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;As of the 3.6 release MongoDB enabled readConcern majority support by default, which requires WiredTiger to retain more historical versions of data (history). That history needs to be kept either in the WiredTiger cache or the cache overflow table which might be slow. Having reviewed different periods of time (based on the uploaded data), events where cache pressure is present were related to times when one of the members was unavailable. &lt;/p&gt;

&lt;p&gt;Your current configuration is PSSA, making the majority of 3. When even 1 out of 2 secondary member is unavailable, you loose the majority and we start to accumulate history (creating cache pressure). With PSS configuration, you will have a majority of 2 and loosing (or having connection issues) one of the secondaries would not create the same situation because you would still have the majority is still 2.&lt;/p&gt;

&lt;p&gt;Regarding the spikes of i/o activity under the write-heavy workload, this is expected. We persist data to disk via checkpoints which by default run every 60 seconds. Given the fact that we&apos;ve seen cases of writing ~2.7GB of data to disk, this can certainly be impactful. There are different tuning approaches to make this spiky behavior perform more smoothly (which include both OS and MongoDB tuning) but this is out of scope for the SERVER project. If you need further assistance with performance tuning, I encourage you to ask our community by posting on the &lt;a href=&quot;https://groups.google.com/group/mongodb-user&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;mongodb-user group&lt;/a&gt; or on &lt;a href=&quot;https://stackoverflow.com/questions/tagged/mongodb&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;Stack Overflow with the &lt;tt&gt;mongodb&lt;/tt&gt; tag&lt;/a&gt;.&lt;/p&gt;

&lt;p&gt;Lastly, even though we do not have data for either of the secondary members, being configured differently from the primary (different i/o characteristics) makes them more vulnerable in terms of replication. You said secondaries are limited to 5k IOPS but your primary spikes with up to 185k IOPS. This makes secondaries, and specifically batch replication, as a potential bottleneck.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Dima &lt;/p&gt;

</comment>
                            <comment id="2573552" author="1147952115@qq.com" created="Sun, 1 Dec 2019 13:08:30 +0000"  >&lt;p&gt; @Dmitry Agranat&lt;/p&gt;

&lt;p&gt;I have a question,  when Write-traffic is very high, why write-IO is 0% for a long time, and then suddenly it&apos;s 100% for a long time, and so on&#12290; when write-IO is 100%,The client connect will block&#12290;&lt;/p&gt;

&lt;p&gt;Whether write-IO can be averaged to each different point in time, This may improve performance&lt;/p&gt;

&lt;p&gt;Looking forward to your reply&#65292; thanks&lt;/p&gt;</comment>
                            <comment id="2573548" author="1147952115@qq.com" created="Sun, 1 Dec 2019 12:13:45 +0000"  >&lt;p&gt; &lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/238904/238904_replSetGetConfig.txt&quot; title=&quot;replSetGetConfig.txt attached to SERVER-44834&quot;&gt;replSetGetConfig.txt&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt; &lt;/p&gt;

&lt;p&gt;the rease is as following:&lt;br/&gt;
1.  The business scenario is that the traffic is almost all write traffic&#65292;There are high concurrent write flow shocks&#12290;in high concurrency I found secondary Pull the data(getmore oplog) use more read IO, so I adjust replWriterThreadCount to 14,  this can Reduce the read IO&#12290;&lt;br/&gt;
2. I adjust cacheSizeGB, because I find The delay time wobbles very seriously.  after adjust cacheSizeGB, The delay time effect is better&lt;br/&gt;
3. dfa is a single SSD disk.&lt;/p&gt;


&lt;p&gt;In addition&#65292;&lt;br/&gt;
The master and slave nodes use different types of machines&#65292; The primary node disk-io performs better than the slave node disk-io, the primary iops is 30000/s&#65292; the secondary iops is 5000/s.&lt;/p&gt;

&lt;p&gt;thanks&lt;/p&gt;</comment>
                            <comment id="2573538" author="dmitry.agranat" created="Sun, 1 Dec 2019 11:01:13 +0000"  >&lt;p&gt;Thanks &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=1147952115%40qq.com&quot; class=&quot;user-hover&quot; rel=&quot;1147952115@qq.com&quot;&gt;1147952115@qq.com&lt;/a&gt;, could you also provide the output of &lt;a href=&quot;https://docs.mongodb.com/manual/reference/command/replSetGetConfig/&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;replSetGetConfig&lt;/a&gt; command from &lt;tt&gt;shard_F0A9938E&lt;/tt&gt;? I think I know what&apos;s going on but first I&apos;ll need to understand your replica set configuration.&lt;/p&gt;

&lt;p&gt;A few more clarifying questions about your current configuration:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;What is the reason you&apos;ve changed the &lt;tt&gt;replWriterThreadCount&lt;/tt&gt; to 14?&lt;/li&gt;
	&lt;li&gt;What is the reason you&apos;ve changed the &lt;tt&gt;cacheSizeGB&lt;/tt&gt; to 50?&lt;/li&gt;
	&lt;li&gt;What is &lt;tt&gt;dfa&lt;/tt&gt; disk, is this a single SSD disk, a LUN partition or something else?&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Thanks,&lt;br/&gt;
Dima&lt;/p&gt;</comment>
                            <comment id="2572957" author="1147952115@qq.com" created="Fri, 29 Nov 2019 12:48:46 +0000"  >&lt;p&gt;@Dmitry Agranat&lt;br/&gt;
the problem appeared at another shard, I get all the log, I have send to you, thanks .&lt;/p&gt;

&lt;p&gt; &lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;a id=&quot;238882_thumb&quot; href=&quot;https://jira.mongodb.org/secure/attachment/238882/238882_11111.png&quot; title=&quot;11111.png&quot; file-preview-type=&quot;image&quot; file-preview-id=&quot;238882&quot; file-preview-title=&quot;11111.png&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/thumbnail/238882/_thumb_238882.png&quot; style=&quot;border: 0px solid black&quot; role=&quot;presentation&quot;/&gt;&lt;/a&gt;&lt;/span&gt; &lt;br/&gt;
 &lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/238883/238883_db.serverstats2.txt&quot; title=&quot;db.serverstats2.txt attached to SERVER-44834&quot;&gt;db.serverstats2.txt&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt; &lt;/p&gt;

&lt;p&gt;if there is a need for other slave info(mongodb.log or  diagnostic.data), please tell me. I have anly send the master diagnostic.data and mongod.log to you&lt;/p&gt;</comment>
                            <comment id="2572612" author="1147952115@qq.com" created="Fri, 29 Nov 2019 03:21:27 +0000"  >
&lt;p&gt;RAID:cache:NRWTD|access:RW|size:223.0GB|state:Optl|type:RAID1|&lt;/p&gt;

&lt;p&gt; &lt;span class=&quot;nobr&quot;&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/attachment/238866/238866_db.serverstatus.wiredTiger.txt&quot; title=&quot;db.serverstatus.wiredTiger.txt attached to SERVER-44834&quot;&gt;db.serverstatus.wiredTiger.txt&lt;sup&gt;&lt;img class=&quot;rendericon&quot; src=&quot;https://jira.mongodb.org/images/icons/link_attachment_7.gif&quot; height=&quot;7&quot; width=&quot;7&quot; align=&quot;absmiddle&quot; alt=&quot;&quot; border=&quot;0&quot;/&gt;&lt;/sup&gt;&lt;/a&gt;&lt;/span&gt;  &lt;span class=&quot;image-wrap&quot; style=&quot;&quot;&gt;&lt;a id=&quot;238867_thumb&quot; href=&quot;https://jira.mongodb.org/secure/attachment/238867/238867_disk-performance.png&quot; title=&quot;disk-performance.png&quot; file-preview-type=&quot;image&quot; file-preview-id=&quot;238867&quot; file-preview-title=&quot;disk-performance.png&quot;&gt;&lt;img src=&quot;https://jira.mongodb.org/secure/thumbnail/238867/_thumb_238867.png&quot; style=&quot;border: 0px solid black&quot; role=&quot;presentation&quot;/&gt;&lt;/a&gt;&lt;/span&gt; &lt;/p&gt;</comment>
                            <comment id="2572180" author="1147952115@qq.com" created="Fri, 29 Nov 2019 02:04:33 +0000"  >&lt;p&gt;@Dmitry Agranat&lt;br/&gt;
Dmitry Agranat, thank you for you reply&lt;/p&gt;

&lt;p&gt;all shard master use the same storage, Where is just one mongod  instance at the physical machine&#12290;but secondary mongod-instance use other type mathine&#65292;The master and slave nodes use different types of machines&#65292; The primary node disk-io performs better than the slave node disk-io, the primary iops is 30000/s&#65292; the secondary iops is 5000/s.&lt;/p&gt;

&lt;p&gt; There&apos;s only so much  diagnostic.data&lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;root@bjht12275 ~&amp;#93;&lt;/span&gt;# ps -ef | grep mongod&lt;br/&gt;
root     319934 318700  0 10:00 pts/1    00:00:00 grep --color mongod&lt;br/&gt;
root     520535      1 99 Nov18 ?        46-22:02:45 /usr/local/mongodb3.6.14/bin/mongod -f /home/service/var/data/mongodb/10000/mongodb.conf&lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;root@bjht12275 ~&amp;#93;&lt;/span&gt;# &lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;root@bjht12275 ~&amp;#93;&lt;/span&gt;# &lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;root@bjht12275 ~&amp;#93;&lt;/span&gt;# &lt;/p&gt;

&lt;p&gt;&lt;span class=&quot;error&quot;&gt;&amp;#91;root@bjht12275 ~&amp;#93;&lt;/span&gt;# &lt;br/&gt;
&lt;span class=&quot;error&quot;&gt;&amp;#91;root@bjht12275 ~&amp;#93;&lt;/span&gt;# df&lt;br/&gt;
Filesystem      1K-blocks      Used  Available Use% Mounted on&lt;br/&gt;
/dev/sda2        51474912  12798384   36038704  27% /&lt;br/&gt;
devtmpfs         98123472         0   98123472   0% /dev&lt;br/&gt;
tmpfs            98134180         4   98134176   1% /dev/shm&lt;br/&gt;
tmpfs            98134180    183308   97950872   1% /run&lt;br/&gt;
tmpfs            98134180         0   98134180   0% /sys/fs/cgroup&lt;br/&gt;
/dev/sda3       178423644    224536  169112644   1% /home&lt;br/&gt;
tmpfs            19626840         0   19626840   0% /run/user/0&lt;br/&gt;
/dev/dfa       6200593304 285911884 5602165036   5% /home/service/var/data&lt;/p&gt;

</comment>
                            <comment id="2571485" author="dmitry.agranat" created="Thu, 28 Nov 2019 13:37:11 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=1147952115%40qq.com&quot; class=&quot;user-hover&quot; rel=&quot;1147952115@qq.com&quot;&gt;1147952115@qq.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;The latest data you&apos;ve uploaded does not show the &lt;tt&gt;nvme&lt;/tt&gt; disk any more, specifically, we can only see the root device under &lt;tt&gt;sda&lt;/tt&gt;. In addition, the latest data does not cover the reported issue on Nov 22nd, around 12:17 AM UTC. The latest &lt;tt&gt;diagnostic.data&lt;/tt&gt; only starts at Nov 23rd, 12:58 AM UTC.&lt;/p&gt;

&lt;p&gt;In oder to be able to help, please provide/clarify:&lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;Are all shards share the same storage? If yes, how many mongod processes in total share the same storage?&lt;/li&gt;
	&lt;li&gt;Is there any other disk attached to this server apart &lt;tt&gt;sda&lt;/tt&gt;?&lt;/li&gt;
	&lt;li&gt;Provide description about your storage, as detailed as possible.&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;Once we&apos;ll understand the storage layout, we might need to recollect the &lt;tt&gt;diagnostic.data&lt;/tt&gt;.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Dima&lt;/p&gt;</comment>
                            <comment id="2571011" author="1147952115@qq.com" created="Thu, 28 Nov 2019 01:48:11 +0000"  >&lt;p&gt;@Dmitry Agranat&lt;br/&gt;
Dmitry Agranat&lt;/p&gt;

&lt;p&gt;sorry, I may have send the wrong diagnose data, I send again with the same Physical machine diagnose data belong to the problem shard&#12290;&lt;/p&gt;

&lt;p&gt;Please confirm whether the diagnose  data is correct this time&lt;/p&gt;

&lt;p&gt;Sorry again&lt;/p&gt;</comment>
                            <comment id="2569940" author="dmitry.agranat" created="Wed, 27 Nov 2019 10:47:23 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=1147952115%40qq.com&quot; class=&quot;user-hover&quot; rel=&quot;1147952115@qq.com&quot;&gt;1147952115@qq.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Just to reiterate my last comment. In order to be able to diagnose the reported observation, we&apos;ll need the &lt;tt&gt;diagnostic.data&lt;/tt&gt; from a server &lt;b&gt;which had this issue&lt;/b&gt;. Having data from other nodes, which do not experience these symptoms, would not help to progress this case.&lt;/p&gt;

&lt;p&gt;It was not clear from your comments if all shards share the same storage, please elaborate.&lt;/p&gt;</comment>
                            <comment id="2567640" author="1147952115@qq.com" created="Wed, 27 Nov 2019 02:21:39 +0000"  >&lt;p&gt;When mongod go wrong, there have too much slow log ,the slow log time is very large&lt;/p&gt;</comment>
                            <comment id="2567633" author="1147952115@qq.com" created="Wed, 27 Nov 2019 02:17:14 +0000"  >&lt;p&gt;this cluster have 11 shards&#65292;Sometimes there&apos;s a lot of traffic&lt;/p&gt;</comment>
                            <comment id="2567632" author="1147952115@qq.com" created="Wed, 27 Nov 2019 02:16:01 +0000"  >&lt;p&gt;@Dmitry Agranat&lt;br/&gt;
Dmitry Agranat&lt;/p&gt;

&lt;p&gt;this problem appears randomly in different shard,  to deal with this problem, I changed the Physical machine&#65292; but problem not resolved&#12290;&lt;br/&gt;
At first I thought it was a hardware problem&#65292; So I changed the Physical machine, but you can Analysis of the log with the same time point.&lt;/p&gt;

&lt;p&gt;this problem repeated in different places&lt;/p&gt;</comment>
                            <comment id="2566269" author="dmitry.agranat" created="Tue, 26 Nov 2019 14:10:22 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=1147952115%40qq.com&quot; class=&quot;user-hover&quot; rel=&quot;1147952115@qq.com&quot;&gt;1147952115@qq.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;The &lt;tt&gt;mongostat&lt;/tt&gt; output you&apos;ve provided in your initial comment belongs to &lt;tt&gt;shard_4FC5EC6E&lt;/tt&gt; server, the &lt;tt&gt;diagnostic.data&lt;/tt&gt; you&apos;ve uploaded is from &lt;tt&gt;shard_110AFE67&lt;/tt&gt; server. &lt;/p&gt;

&lt;p&gt;Please upload the &lt;tt&gt;diagnostic.data&lt;/tt&gt; from &lt;tt&gt;shard_4FC5EC6E&lt;/tt&gt; server. &lt;/p&gt;

&lt;p&gt;Are all shards share the same storage? If yes, how many mongod processes in total share the same storage?&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Dima&lt;/p&gt;</comment>
                            <comment id="2566127" author="1147952115@qq.com" created="Tue, 26 Nov 2019 12:12:08 +0000"  >&lt;p&gt;@Dmitry Agranat &lt;br/&gt;
Dmitry Agranat&lt;/p&gt;

&lt;p&gt;I have send diagnostic.data to you, but mongodb.log is too large&#65292;I do not send. thanks&lt;br/&gt;
if you resolve this proble, please tell or email me, thanks very much.&lt;br/&gt;
This problem seriously affects our business&#65292;thanks again.&lt;/p&gt;</comment>
                            <comment id="2565787" author="dmitry.agranat" created="Tue, 26 Nov 2019 07:12:52 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=1147952115%40qq.com&quot; class=&quot;user-hover&quot; rel=&quot;1147952115@qq.com&quot;&gt;1147952115@qq.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;Would you please archive (tar or zip) the mongod.log files and the &lt;tt&gt;$dbpath/diagnostic.data&lt;/tt&gt; directory (the contents are described &lt;a href=&quot;https://docs.mongodb.com/manual/administration/analyzing-mongodb-performance/#full-time-diagnostic-data-capture&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;here&lt;/a&gt;) and upload them to this &lt;a href=&quot;https://10gen-httpsupload.s3.amazonaws.com/upload_forms/fc72ec3e-e897-434e-871a-ec176eb9e2e8.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;support uploader&lt;/a&gt; location?&lt;/p&gt;

&lt;p&gt;Files uploaded to this portal are visible only to MongoDB employees and are routinely deleted after some time.&lt;/p&gt;

&lt;p&gt;Thanks,&lt;br/&gt;
Dima&lt;/p&gt;</comment>
                            <comment id="2565784" author="1147952115@qq.com" created="Tue, 26 Nov 2019 07:09:52 +0000"  >&lt;p&gt;fdisk info:&lt;/p&gt;



&lt;p&gt;Disk /dev/sda: 240.1 GB, 240057409536 bytes&lt;br/&gt;
255 heads, 63 sectors/track, 29185 cylinders&lt;br/&gt;
Units = cylinders of 16065 * 512 = 8225280 bytes&lt;br/&gt;
Sector size (logical/physical): 512 bytes / 4096 bytes&lt;br/&gt;
I/O size (minimum/optimal): 4096 bytes / 4096 bytes&lt;br/&gt;
Disk identifier: 0x00034df4&lt;/p&gt;

&lt;p&gt;   Device Boot      Start         End      Blocks   Id  System&lt;br/&gt;
/dev/sda1   *           1        5222    41943040   83  Linux&lt;br/&gt;
/dev/sda2            5222       10183    39845888   83  Linux&lt;br/&gt;
/dev/sda3           10183       10183        1024   83  Linux&lt;br/&gt;
/dev/sda4           10183       29186   152639488    5  Extended&lt;br/&gt;
/dev/sda5           10183       29186   152638464   83  Linux&lt;/p&gt;

&lt;p&gt;WARNING: GPT (GUID Partition Table) detected on &apos;/dev/nvme0n1&apos;! The util fdisk doesn&apos;t support GPT. Use GNU Parted.&lt;/p&gt;


&lt;p&gt;Disk /dev/nvme0n1: 6401.3 GB, 6401252745216 bytes&lt;br/&gt;
255 heads, 63 sectors/track, 778241 cylinders&lt;br/&gt;
Units = cylinders of 16065 * 512 = 8225280 bytes&lt;br/&gt;
Sector size (logical/physical): 512 bytes / 512 bytes&lt;br/&gt;
I/O size (minimum/optimal): 512 bytes / 512 bytes&lt;br/&gt;
Disk identifier: 0x00000000&lt;/p&gt;

&lt;p&gt;        Device Boot      Start         End      Blocks   Id  System&lt;br/&gt;
/dev/nvme0n1p1               1      267350  2147483647+  ee  GPT&lt;/p&gt;</comment>
                            <comment id="2565768" author="1147952115@qq.com" created="Tue, 26 Nov 2019 06:26:22 +0000"  >&lt;p&gt;@Mirko Bonadei &lt;br/&gt;
why dirty is very high for several hours, and I think wiredtiger not evict dirty page to disk&#65292;it is hanged&lt;/p&gt;</comment>
                            <comment id="2565752" author="1147952115@qq.com" created="Tue, 26 Nov 2019 05:29:47 +0000"  >&lt;p&gt;Linux bjht12438 3.10.0-957.27.2.el7.x86_64 #1 SMP Mon Jul 29 17:46:05 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux&lt;/p&gt;


&lt;p&gt;@carl.champain   @redbeard0531&lt;br/&gt;
can you give me some help&lt;/p&gt;</comment>
                    </comments>
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                        <customfieldvalues>
                            <customfieldvalue>&lt;p&gt;dirty is very high, but do not evit to disk, disk io is 0%&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;iostat log as following:&lt;/p&gt;

&lt;p&gt;11/22/2019 12:17:21 AM&lt;br/&gt;
avg-cpu: %user %nice %system %iowait %steal %idle&lt;br/&gt;
 3.43 0.00 1.01 0.02 0.00 95.55&lt;/p&gt;

&lt;p&gt;Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util&lt;br/&gt;
sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00&lt;br/&gt;
dfa 0.00 0.00 15.00 546.00 208.00 2588.00 9.97 0.00 0.01 0.00 0.01 0.01 0.30&lt;/p&gt;

&lt;p&gt;11/22/2019 12:17:22 AM&lt;br/&gt;
avg-cpu: %user %nice %system %iowait %steal %idle&lt;br/&gt;
 2.90 0.00 0.56 0.00 0.00 96.54&lt;/p&gt;

&lt;p&gt;Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util&lt;br/&gt;
sda 0.00 1.00 0.00 2.00 0.00 12.00 12.00 0.00 0.00 0.00 0.00 0.00 0.00&lt;br/&gt;
dfa 0.00 0.00 0.00 485.00 0.00 2276.00 9.39 0.00 0.00 0.00 0.00 0.00 0.00&lt;/p&gt;

&lt;p&gt;11/22/2019 12:17:23 AM&lt;br/&gt;
avg-cpu: %user %nice %system %iowait %steal %idle&lt;br/&gt;
 3.51 0.00 1.07 0.02 0.00 95.41&lt;/p&gt;

&lt;p&gt;Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util&lt;br/&gt;
sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00&lt;br/&gt;
dfa 0.00 0.00 0.00 509.00 0.00 2468.00 9.70 0.00 0.00 0.00 0.00 0.00 0.10&lt;/p&gt;

&lt;p&gt;11/22/2019 12:17:24 AM&lt;br/&gt;
avg-cpu: %user %nice %system %iowait %steal %idle&lt;br/&gt;
 4.20 0.00 1.79 0.00 0.00 94.00&lt;/p&gt;

&lt;p&gt;Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util&lt;br/&gt;
sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00&lt;br/&gt;
dfa 0.00 0.00 0.00 531.00 0.00 2472.00 9.31 0.00 0.01 0.00 0.01 0.01 0.30&lt;/p&gt;

&lt;p&gt;11/22/2019 12:17:25 AM&lt;br/&gt;
avg-cpu: %user %nice %system %iowait %steal %idle&lt;br/&gt;
 4.19 0.00 2.03 0.00 0.00 93.78&lt;/p&gt;

&lt;p&gt;Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util&lt;br/&gt;
sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00&lt;br/&gt;
dfa 0.00 0.00 1.98 474.26 11.88 2249.50 9.50 0.00 0.00 0.50 0.00 0.00 0.20&lt;/p&gt;

&lt;p&gt;11/22/2019 12:17:26 AM&lt;br/&gt;
avg-cpu: %user %nice %system %iowait %steal %idle&lt;br/&gt;
 1.86 0.00 1.80 0.05 0.00 96.30&lt;/p&gt;

&lt;p&gt;Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util&lt;br/&gt;
sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00&lt;br/&gt;
dfa 0.00 0.00 0.00 109721.00 0.00 1053840.00 19.21 25.67 0.23 0.00 0.23 0.01 62.00&lt;/p&gt;

&lt;p&gt;11/22/2019 12:17:27 AM&lt;br/&gt;
avg-cpu: %user %nice %system %iowait %steal %idle&lt;br/&gt;
 1.43 0.00 0.56 0.00 0.00 98.01&lt;/p&gt;

&lt;p&gt;Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util&lt;br/&gt;
sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00&lt;br/&gt;
dfa 0.00 0.00 0.00 436.00 0.00 2076.00 9.52 0.00 0.00 0.00 0.00 0.00 0.00&lt;/p&gt;

&lt;p&gt;11/22/2019 12:17:28 AM&lt;br/&gt;
avg-cpu: %user %nice %system %iowait %steal %idle&lt;br/&gt;
 1.82 0.00 0.91 0.00 0.00 97.27&lt;/p&gt;

&lt;p&gt;Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util&lt;br/&gt;
sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00&lt;br/&gt;
dfa 0.00 0.00 0.00 474.00 0.00 2312.00 9.76 0.00 0.00 0.00 0.00 0.00 0.20&lt;/p&gt;</customfieldvalue>

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