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Hi All,
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<div class="">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 class="">1. gpfs23 - 900+ TB and which corresponds to /scratch and /data, and which I’ve unmounted across the cluster because it has data replication set to 1.</div>
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<div class="">2. gpfs22 - 42 TB and which corresponds to /home. It has data replication set to two, so what we’re doing is “mmchdisk gpfs22 suspend -d <the gpfs22 NSD>”, then doing the firmware upgrade, and once the array is back we’re doing a “mmchdisk gpfs22
resume -d <NSD>”, followed by “mmchdisk gpfs22 start -d <NSD>”.</div>
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<div class="">On the 1st storage array this went very smoothly … the mmchdisk took about 5 minutes, which is what I would expect.</div>
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<div class="">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’s been stuck at:</div>
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<div class="">mmchdisk: Processing continues ...</div>
<div class="">Scanning file system metadata, phase 1 …</div>
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<div class="">There are no waiters of any significance and “mmdiag —iohist” doesn’t show any issues either.</div>
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<div class="">Any ideas, anyone? Unless I can figure this out I’m hosed for this downtime, as I’ve got 7 more arrays to do after this one!</div>
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<div class="">Thanks!</div>
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<div class="">Kevin Buterbaugh - Senior System Administrator</div>
<div class="">Vanderbilt University - Advanced Computing Center for Research and Education</div>
<div class=""><a href="mailto:Kevin.Buterbaugh@vanderbilt.edu" class="">Kevin.Buterbaugh@vanderbilt.edu</a> - (615)875-9633</div>
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