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Hi All,
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<div class="">So I had noticed some waiters on my NSD servers that I thought were unrelated to the mmchdisk. However, I decided to try rebooting my NSD servers one at a time (mmshutdown failed!) to clear that up \u2026 and evidently one of them had things hung
up because the mmchdisk start completed.</div>
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<div class="">Thanks\u2026</div>
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<div class="">Kevin<br class="">
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<div class="">On Jul 15, 2018, at 12:34 PM, Knister, Aaron S. (GSFC-606.2)[COMPUTER SCIENCE CORP] <<a href="mailto:aaron.s.knister@nasa.gov" class="">aaron.s.knister@nasa.gov</a>> wrote:</div>
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<div dir="ltr" class="">Hmm...have you dumped waiters across the entire cluster or just on the NSD servers/fs managers? Maybe there\u2019s a slow node out there participating in the suspend effort? Might be worth running some quick tracing on the FS manager to see
what it\u2019s up to. </div>
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<div class="null" dir="auto">On July 15, 2018 at 13:27:54 EDT, Buterbaugh, Kevin L <<a href="mailto:Kevin.Buterbaugh@Vanderbilt.Edu" class="">Kevin.Buterbaugh@Vanderbilt.Edu</a>> wrote:<br class="null">
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Hi All,
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<div nop="" class="null">We are in a partial cluster downtime today to do firmware upgrades on our storage arrays. It is a partial downtime because we have two GPFS filesystems:</div>
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<div nop="" class="null">1. gpfs23 - 900+ TB and which corresponds to /scratch and /data, and which I\u2019ve unmounted across the cluster because it has data replication set to 1.</div>
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<div nop="" class="null">2. gpfs22 - 42 TB and which corresponds to /home. It has data replication set to two, so what we\u2019re doing is \u201cmmchdisk gpfs22 suspend -d <the gpfs22 NSD>\u201d, then doing the firmware upgrade, and once the array is back we\u2019re doing a
\u201cmmchdisk gpfs22 resume -d <NSD>\u201d, followed by \u201cmmchdisk gpfs22 start -d <NSD>\u201d.</div>
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<div nop="" class="null">On the 1st storage array this went very smoothly \u2026 the mmchdisk took about 5 minutes, which is what I would expect.</div>
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<div nop="" class="null">But on the 2nd storage array the mmchdisk appears to either be hung or proceeding at a glacial pace. For more than an hour it\u2019s been stuck at:</div>
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<div nop="" class="null">mmchdisk: Processing continues ...</div>
<div nop="" class="null">Scanning file system metadata, phase 1 \u2026</div>
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<div nop="" class="null">There are no waiters of any significance and \u201cmmdiag \u2014iohist\u201d doesn\u2019t show any issues either.</div>
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<div nop="" class="null">Any ideas, anyone? Unless I can figure this out I\u2019m hosed for this downtime, as I\u2019ve got 7 more arrays to do after this one!</div>
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<div nop="" class="null">Thanks!</div>
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<div nop="" class="null">\u2014</div>
<div nop="" class="null">Kevin Buterbaugh - Senior System Administrator</div>
<div nop="" class="null">Vanderbilt University - Advanced Computing Center for Research and Education</div>
<div nop="" class="null"><a href="mailto:Kevin.Buterbaugh@vanderbilt.edu" nop="" class="null">Kevin.Buterbaugh@vanderbilt.edu</a> - (615)875-9633</div>
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