https://jira.whamcloud.com This file is an XML representation of an issue en-us 9.4.14 940014 05-12-2023 https://jira.whamcloud.com/browse/LU-16198 Lustre <p>This issue was created by maloo for S Buisson &lt;sbuisson@ddn.com&gt;</p> <p>This issue relates to the following test suite run: <a href="https://testing.whamcloud.com/test_sets/4a579469-93b2-4c09-9114-b0f1258c2fc9" class="external-link" target="_blank" rel="nofollow noopener">https://testing.whamcloud.com/test_sets/4a579469-93b2-4c09-9114-b0f1258c2fc9</a></p> <p>test_33hh failed with the following error:</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>MDT index match 49/250 times </pre> </div></div> <p>Test log is:</p> <div class="preformatted panel" style="border-width: 1px;"><div class="preformattedContent panelContent"> <pre>== sanity test 33hh: temp file is located on the same MDT as target (crush2) ========================================================== 16:36:28 (1664469388) MDS1_VERSION=34550793 version_code=34537472 striped dir -i1 -c4 -H crush2 /mnt/lustre/d33hh.sanity pattern .f33hh.sanity.XXXXXX /mnt/lustre/d33hh.sanity/.f33hh.sanity.NPJRGZ MDT index mismatch 0 != 2 pattern f33hh.sanity.XXXXXXXX 1/250 MDT index mismatches, expect ~2-4 pattern .f33hh.sanity.XXXXXX pattern f33hh.sanity.XXXXXXXX 52/250 matches, expect ~62 for crush2 pattern=.f33hh.sanity....XXX pattern=f33hh.sanity....XXXXX 49/250 matches, expect ~62 for crush2 sanity test_33hh: @@@@@@ FAIL: MDT index match 49/250 times </pre> </div></div> <p>VVVVVVV DO NOT REMOVE LINES BELOW, Added by Maloo for auto-association VVVVVVV<br/> sanity test_33hh - MDT index match 49/250 times</p> LU-16198

sanity test_33hh: MDT index match 49/250 times

Bug Minor Resolved Fixed Andreas Dilger Maloo Fri, 30 Sep 2022 06:33:41 +0000 Sat, 15 Oct 2022 09:41:57 +0000 Sat, 15 Oct 2022 09:41:57 +0000 Lustre 2.16.0 0 4 <p>+1 on master:<a href="https://testing.whamcloud.com/test_sets/3fe086d9-2c34-49c2-9413-42383acff1c8" class="external-link" target="_blank" rel="nofollow noopener">https://testing.whamcloud.com/test_sets/3fe086d9-2c34-49c2-9413-42383acff1c8</a></p> <p>This test failure is mostly caused by random chance based on the filenames created by "<tt>mktemp()</tt>" being all-number or all-uppercase or all-lowercase letters. Statistically this should be rare to have many of these, but the many times that this subtest is run (421 runs in the past week) means that the test will randomly fail occasionally (0.47% ).</p> <p>Options for fixing it would include:</p> <ul class="alternate" type="square"> <li>increase the margin of error for allowing this to pass. Currently the threshold is 80% of the expected number of files per MDT (<tt>250 files / 4 MDTs = 62 * 4/5 = 49 files</tt>, or <tt>62 * 5/4 = 77 files</tt>). In the past 3 months the subtest has failed 20 times, almost all of them are 46/250 or more. One failure is 45/250 and one is 80/250, so using <tt>5/7=71%</tt>, so <tt>62 * 5/7 = 44 files</tt> or <tt>62 * 7/5 = 86 files</tt> should avoid virtually all random errors.</li> <li>automatically re-running the subtest if it fails <b>once</b> would also reduce the chance of randomly reporting an error from <tt>0.4% = 2/421</tt> to <tt>1/40000</tt>, or less than once every two years at the current rate of ~1500 runs per month.</li> </ul> <p>"Andreas Dilger &lt;adilger@whamcloud.com&gt;" uploaded a new patch: <a href="https://review.whamcloud.com/48713" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/48713</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-16198" title="sanity test_33hh: MDT index match 49/250 times" class="issue-link" data-issue-key="LU-16198"><del>LU-16198</del></a> tests: increase margin for sanity/33hh<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: 1<br/> Commit: 0efdd531c2896812c430e0ca623ef67fb2002ca1</p> <p>"Oleg Drokin &lt;green@whamcloud.com&gt;" merged in patch <a href="https://review.whamcloud.com/c/fs/lustre-release/+/48713/" class="external-link" target="_blank" rel="nofollow noopener">https://review.whamcloud.com/c/fs/lustre-release/+/48713/</a><br/> Subject: <a href="https://jira.whamcloud.com/browse/LU-16198" title="sanity test_33hh: MDT index match 49/250 times" class="issue-link" data-issue-key="LU-16198"><del>LU-16198</del></a> tests: increase margin for sanity/33hh<br/> Project: fs/lustre-release<br/> Branch: master<br/> Current Patch Set: <br/> Commit: e17471792388e59f44040d48dd8138ec865663af</p> <p>Landed for 2.16</p> Related LU-15720 LU-13481 Development Rank 1|i031pr: Rank (Obsolete) 9223372036854775807 Severity