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Thanks for the info. Ive downloaded the patch, but am I supposed to run this on source code and compile, or what? I don't suppose you could give me a quick rundown on how to apply the patch correctly?</div>
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Thanks,</div>
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Kevin<br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Spitz, Cory James <cory.spitz@hpe.com><br>
<b>Sent:</b> Thursday, February 27, 2020 4:58 PM<br>
<b>To:</b> Konzem, Kevin P <kkonzem@contractor.usgs.gov>; Nathan Dauchy - NOAA Affiliate <nathan.dauchy@noaa.gov><br>
<b>Cc:</b> lustre-discuss@lists.lustre.org <lustre-discuss@lists.lustre.org><br>
<b>Subject:</b> [EXTERNAL] Re: [lustre-discuss] Re: DF bug with lustre 2.12.4</font>
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<p class="x_MsoNormal">Hello, Kevin.</p>
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<p class="x_MsoNormal">I see from LU-13285 that Nathan D. pointed you at LU-13296. I left a comment in the ticket as well. I think that you can try the patch from LU-13296 with your reproducer.</p>
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<p class="x_MsoNormal">-Cory</p>
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<p class="x_MsoNormal" style="margin-left:.5in">On 2/21/20, 10:08 AM, "lustre-discuss on behalf of Konzem, Kevin P" <<a href="mailto:lustre-discuss-bounces@lists.lustre.org">lustre-discuss-bounces@lists.lustre.org</a> on behalf of
<a href="mailto:kkonzem@contractor.usgs.gov">kkonzem@contractor.usgs.gov</a>> wrote:</p>
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<p class="x_MsoNormal" style="margin-left:.5in"><span style="font-size:12.0pt; color:black">Nathan, Ive created a Jira issue for this,
<a href="https://jira.whamcloud.com/browse/LU-13285">LU-13285</a>. In it I attached the output of an strace where I was able to capture a string of both successful and failed df's.</span></p>
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<p class="x_MsoNormal" style="margin-left:.5in"><b><span style="color:black">From:</span></b><span style="color:black"> Nathan Dauchy - NOAA Affiliate <nathan.dauchy@noaa.gov><br>
<b>Sent:</b> Thursday, February 20, 2020 2:35 PM<br>
<b>To:</b> Konzem, Kevin P <kkonzem@contractor.usgs.gov><br>
<b>Cc:</b> lustre-discuss@lists.lustre.org <lustre-discuss@lists.lustre.org><br>
<b>Subject:</b> [EXTERNAL] Re: [lustre-discuss] DF bug with lustre 2.12.4</span> </p>
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<p class="x_MsoNormal" style="margin-left:.5in">On Thu, Feb 20, 2020 at 11:47 AM Konzem, Kevin P <<a href="mailto:kkonzem@contractor.usgs.gov">kkonzem@contractor.usgs.gov</a>> wrote:</p>
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<p class="x_MsoNormal" style="margin-left:.5in"><span style="font-size:12.0pt; color:black">test this by running 'while [ true ];do /bin/df -TP /performance;done' on two sessions on the same client. As soon as I start the second while loop, the outputs go from:</span></p>
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<p class="x_MsoNormal" style="margin-left:.5in"><span style="font-size:12.0pt; color:black">Filesystem Type 1024-blocks Used Available Capacity Mounted on<br>
192.168.0.181@tcp:/perform lustre 71467728 100416 67664944 1% /performance</span></p>
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<p class="x_MsoNormal" style="margin-left:.5in"><span style="font-size:12.0pt; color:black">to:</span></p>
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<p class="x_MsoNormal" style="margin-left:.5in"><span style="font-size:12.0pt; color:black">Filesystem Type 1024-blocks Used Available Capacity Mounted on<br>
192.168.0.181@tcp:/perform lustre 0 -0 -0 50% /performance</span></p>
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<p class="x_MsoNormal" style="margin-left:.5in">Kevin,</p>
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<p class="x_MsoNormal" style="margin-left:.5in">I can confirm seeing this issue intermittently as well, and usually with a re-run of df the results are once again reasonable. It looks like you have a more reliable reproducer though, which is good! A support
ticket was opened with our vendor, and they said if we can capture a "strace" of it for a bad run that might be helpful... but I haven't caught it in the act yet. With your reproducer, can you get that and open a Jira ticket to track the problem?</p>
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<p class="x_MsoNormal" style="margin-left:.5in">As a workaround, try "lfs df" instead, it may take a different code path that avoids the bug.</p>
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<p class="x_MsoNormal" style="margin-left:.5in">-Nathan</p>
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