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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-48389] WT read checksum error, what could be the cause?</title>
                <link>https://jira.mongodb.org/browse/SERVER-48389</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;Hello!&lt;br/&gt;
I&apos;m running MongoDB 4.2.6 in a PSS replicaset.&lt;/p&gt;

&lt;p&gt;On May 20 at 14:33 (UTC+2) my primary server crashed suddenly (no specific job or load) with this error:&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;
		&lt;tbody &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;  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;2020-05-20T14:33:46.772+0200 E  STORAGE  [conn142228] WiredTiger error (0) [1589978026:771891][9164:0x7f653a038700], file:collection-48--3355261872768217798.wt, WT_CURSOR.next: __wt_block_read_off, 274: collection-48--3355261872768217798.wt: read checksum error for 114688B block at offset 3694592000: calculated block checksum  doesn&apos;t match expected checksum Raw: [1589978026:771891][9164:0x7f653a038700], file:collection-48--3355261872768217798.wt, WT_CURSOR.next: __wt_block_read_off, 274: collection-48--3355261872768217798.wt: read checksum error for 114688B block at offset 3694592000: calculated block checksum  doesn&apos;t match expected checksum&lt;/span&gt;&lt;/pre&gt;
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		&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;...&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;(and then a dump of some memory)&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;...&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;2020-05-20T14:33:46.786+0200 E  STORAGE  [conn142228] WiredTiger error (-31802) [1589978026:786272][9164:0x7f653a038700], file:collection-48--3355261872768217798.wt, WT_CURSOR.next: __wt_block_read_off, 292: collection-48--3355261872768217798.wt: fatal read error: WT_ERROR: non-specific WiredTiger error Raw: [1589978026:786272][9164:0x7f653a038700], file:collection-48--3355261872768217798.wt, WT_CURSOR.next: __wt_block_read_off, 292: collection-48--3355261872768217798.wt: fatal read error: WT_ERROR: non-specific WiredTiger error&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;2020-05-20T14:33:46.786+0200 E  STORAGE  [conn142228] WiredTiger error (-31804) [1589978026:786278][9164:0x7f653a038700], file:collection-48--3355261872768217798.wt, WT_CURSOR.next: __wt_panic, 490: the process must exit and restart: WT_PANIC: WiredTiger library panic Raw: [1589978026:786278][9164:0x7f653a038700], file:collection-48--3355261872768217798.wt, WT_CURSOR.next: __wt_panic, 490: the process must exit and restart: WT_PANIC: WiredTiger library panic&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;2020-05-20T14:33:46.786+0200 F  -        [conn142228] Fatal Assertion 50853 at src/mongo/db/storage/wiredtiger/wiredtiger_util.cpp 414&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;2020-05-20T14:33:46.786+0200 F  -        [conn142228] &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;   margin-bottom: 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;2020-05-20T14:33:46.822+0200 F  -        [conn142228] Got signal: 6 (Aborted).&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;The fail-over went well fortunately, one of the secondary became primary. I had a look at this error which looks like corrupted data read (not sure if it&apos;s from disk or memory?) the server is fairly new, I ran some tests on the disk and memory but didn&apos;t find any problem. Can do you provide a bit more details about what could cause this error? anyway I could make sure if it&apos;s hardware or software? anything to investigate in mongodb code itself?&lt;/p&gt;

&lt;p&gt;After that (May 20 at 22:21 UTC+2) I tried restarting mongo (without clearing the data dir) to see if it can recover by itself or not and ended up in a weird state: mongo seemed to start normally from the logs, I didn&apos;t see anything supicious related to corrupted data (maybe you&apos;ll find some). The log says the server went into rollback state and then secondary, but then talks about rollback again, here is an extract:&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;
		&lt;tbody &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;  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;2020-05-20T22:21:33.748+0200 I  REPL     [rsBackgroundSync] Replication commit point: { ts: Timestamp(0, 0), t: -1 }&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;2020-05-20T22:21:33.748+0200 I  REPL     [rsBackgroundSync] Rollback using &apos;recoverToStableTimestamp&apos; method.&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;2020-05-20T22:21:33.748+0200 I  REPL     [rsBackgroundSync] Scheduling rollback (sync source: db2.updn.io:27017)&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;2020-05-20T22:21:33.748+0200 I  ROLLBACK [rsBackgroundSync] transition to ROLLBACK&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;2020-05-20T22:21:33.748+0200 I  REPL     [rsBackgroundSync] State transition ops metrics: { lastStateTransition: &quot;rollback&quot;, userOpsKilled: 0, userOpsRunning: 30 }&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;2020-05-20T22:21:33.748+0200 I  REPL     [rsBackgroundSync] transition to ROLLBACK from SECONDARY&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;...&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;2020-05-20T22:21:33.748+0200 I  ROLLBACK [rsBackgroundSync] Waiting for all background operations to complete before starting rollback&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;...&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;2020-05-20T22:21:33.749+0200 I  ROLLBACK [rsBackgroundSync] Finished waiting for background operations to complete before rollback&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;   margin-bottom: 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;2020-05-20T22:21:33.749+0200 I  ROLLBACK [rsBackgroundSync] finding common point&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;But at this point, it was not catching up, not doing anything visible (no CPU or disk activity) and I could NOT connect to it, when starting the mongo shell it would initiate the connection but hang before displaying the prompt (no error). In the logs I only see a bunch of (probably from your monitoring daemon?):&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;
		&lt;tbody &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;  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;2020-05-20T22:23:44.170+0200 I  NETWORK  [listener] connection accepted from 178.63.21.176:34998 #149 (75 connections now open)&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;2020-05-20T22:23:44.170+0200 I  NETWORK  [conn149] received client metadata from 178.63.21.176:34998 conn149: { driver: { name: &quot;mongo-go-driver&quot;, version: &quot;v1.1.4&quot; }, os: { type: &quot;linux&quot;, architecture: &quot;amd64&quot; }, platform: &quot;go1.13.4&quot; }&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;   margin-bottom: 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;2020-05-20T22:23:44.182+0200 I  NETWORK  [conn144] end connection 178.63.21.176:34902 (74 connections now open)&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;
&lt;p&gt;Impossible to get a shell and the server doesn&apos;t move. Even doing &quot;sudo systemctl stop mongodb&quot; did NOT stop the server, it hanged. I had to send a SIGTERM to stop it (I think systemctl also send SIGTERM so not sure why, maybe it was just slow and I got lucky on the timing).&lt;/p&gt;

&lt;p&gt;I think there was not enough headway on the other servers to catch-up sync so it may be expected that this server stayed stuck, but I did not expect to be unable to get prompt and send commands. Is this expected?&lt;/p&gt;

&lt;p&gt;After that I decided to clear the data dir and do an initial sync so unfortunately I don&apos;t have the diagnostic.data any more, but I have the complete log if you want.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1361316">SERVER-48389</key>
            <summary>WT read checksum error, what could be the cause?</summary>
                <type id="6" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14720&amp;avatarType=issuetype">Question</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="9">Done</resolution>
                                        <assignee username="carl.champain@mongodb.com">Carl Champain</assignee>
                                    <reporter username="bigbourin@gmail.com">Adrien Jarthon</reporter>
                        <labels>
                    </labels>
                <created>Sat, 23 May 2020 13:30:51 +0000</created>
                <updated>Wed, 27 May 2020 22:37:08 +0000</updated>
                            <resolved>Wed, 27 May 2020 21:47:24 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="3132965" author="carl.champain" created="Wed, 27 May 2020 22:37:08 +0000"  >&lt;p&gt;Yes, this error is most likely about disk failure.&#160;&lt;/p&gt;</comment>
                            <comment id="3132899" author="bigbourin@gmail.com" created="Wed, 27 May 2020 21:56:22 +0000"  >&lt;p&gt;Ok thanks, so this error is more about disk failure not RAM? As I don&apos;t have the data dir (I have most of the rest though) let&apos;s not spend our time trying to dig more and it&apos;ll probably lead nowhere. If I see this again I&apos;ll definitely try to keep the data dir.&lt;/p&gt;</comment>
                            <comment id="3132863" author="carl.champain" created="Wed, 27 May 2020 21:46:06 +0000"  >&lt;p&gt;Hi &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=bigbourin%40gmail.com&quot; class=&quot;user-hover&quot; rel=&quot;bigbourin@gmail.com&quot;&gt;bigbourin@gmail.com&lt;/a&gt;,&lt;/p&gt;

&lt;p&gt;The WT read checksum error leads us to suspect some form of physical corruption. If you encounter this problem again in the future holding onto a copy of the database&apos;s $dbpath directory would be helpful.&#160;Our ability to determine the source of corruption would also depend on your ability to provide:&lt;/p&gt;
&lt;ol&gt;
	&lt;li&gt;The logs for the affected node, including before, leading up to, and after the first sign of corruption.&lt;/li&gt;
	&lt;li&gt;A description of the underlying storage mechanism in use, including details like:
	&lt;ol&gt;
		&lt;li&gt;What file system and/or volume management system is in use?&lt;/li&gt;
		&lt;li&gt;Is data storage locally attached or network-attached?&lt;/li&gt;
		&lt;li&gt;Are disks RAIDed and if so how?&lt;/li&gt;
		&lt;li&gt;Are disks SSDs or HDDs?&lt;/li&gt;
	&lt;/ol&gt;
	&lt;/li&gt;
	&lt;li&gt;A description of your backup method, if any.&lt;/li&gt;
	&lt;li&gt;A description of your disks have been recently checked for integrity?&lt;/li&gt;
	&lt;li&gt;A history of the deployment, including:
	&lt;ol&gt;
		&lt;li&gt;a timeline of version changes&lt;/li&gt;
		&lt;li&gt;a timeline of hardware upgrade/downgrade cycles or configuration changes&lt;/li&gt;
		&lt;li&gt;a timeline of disaster recovery or backup restoration activities&lt;/li&gt;
		&lt;li&gt;a timeline of any manipulations of the underlying database files, including copies or moves, and information about whether mongod was running during each manipulation.&lt;/li&gt;
	&lt;/ol&gt;
	&lt;/li&gt;
&lt;/ol&gt;


&lt;p&gt;We recommend you keep an eye out for that host.&lt;/p&gt;
&lt;blockquote&gt;&lt;p&gt;Is this expected?&lt;/p&gt;&lt;/blockquote&gt;
&lt;p&gt;The ideal resolution is to perform a clean &lt;a href=&quot;https://docs.mongodb.org/manual/tutorial/resync-replica-set-member/#automatically-sync-a-member&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;resync&lt;/a&gt; from an unaffected node. Otherwise unexpected behavior may occur and the corruption problem won&apos;t be fixed.&lt;/p&gt;

&lt;p&gt;I will now close this ticket.&lt;/p&gt;

&lt;p&gt;Kind regards,&lt;br/&gt;
 Carl&lt;br/&gt;
 &#160;&lt;/p&gt;</comment>
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