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Hi Olaf,
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<div class="">I didn\u2019t touch pitWorkerThreadsPerNode \u2026 it was already zero.</div>
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<div class="">I\u2019m running 4.2.2.3 on my GPFS servers (some clients are on 4.2.1.1 or 4.2.0.3 and are gradually being upgraded). What version of GPFS fixes this? With what I\u2019m doing I need the ability to run mmrestripefs.</div>
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<div class="">It seems to me that mmrestripefs could check whether QOS is enabled \u2026 granted, it would have no way of knowing whether the values used actually are reasonable or not \u2026 but if QOS is enabled then \u201ctrust\u201d it to not overrun the system.</div>
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<div class="">PMR time? Thanks..</div>
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<div class="">Kevin</div>
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<div class="">On May 4, 2017, at 10:54 AM, Olaf Weiser <<a href="mailto:olaf.weiser@de.ibm.com" class="">olaf.weiser@de.ibm.com</a>> wrote:</div>
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<div class=""><font size="2" face="sans-serif" class="">HI Kevin, </font><br class="">
<font size="2" face="sans-serif" class="">the number of NSDs is more or less nonsense .. it is just the number of nodes x PITWorker should not exceed to much the #mutex/FS block</font><br class="">
<font size="2" face="sans-serif" class="">did you adjust/tune the PitWorker ? ...
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<font size="2" face="sans-serif" class="">so far as I know.. that the code checks the number of NSDs is already considered as a defect and will be fixed / is already fixed ( I stepped into it here as well)
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<font size="2" face="sans-serif" class="">ps. QOS is the better approach to address this, but unfortunately.. not everyone is using it by default... that's why I suspect , the development decide to put in a check/limit here .. which in your case(with QOS) would'nt
needed </font><br class="">
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<font size="1" color="#5f5f5f" face="sans-serif" class="">From: </font><font size="1" face="sans-serif" class="">"Buterbaugh, Kevin L" <<a href="mailto:Kevin.Buterbaugh@Vanderbilt.Edu" class="">Kevin.Buterbaugh@Vanderbilt.Edu</a>></font><br class="">
<font size="1" color="#5f5f5f" face="sans-serif" class="">To: </font><font size="1" face="sans-serif" class="">gpfsug main discussion list <<a href="mailto:gpfsug-discuss@spectrumscale.org" class="">gpfsug-discuss@spectrumscale.org</a>></font><br class="">
<font size="1" color="#5f5f5f" face="sans-serif" class="">Date: </font><font size="1" face="sans-serif" class="">05/04/2017 05:44 PM</font><br class="">
<font size="1" color="#5f5f5f" face="sans-serif" class="">Subject: </font><font size="1" face="sans-serif" class="">Re: [gpfsug-discuss] Well, this is the pits...</font><br class="">
<font size="1" color="#5f5f5f" face="sans-serif" class="">Sent by: </font><font size="1" face="sans-serif" class=""><a href="mailto:gpfsug-discuss-bounces@spectrumscale.org" class="">gpfsug-discuss-bounces@spectrumscale.org</a></font><br class="">
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<font size="3" class="">Hi Olaf, </font><br class="">
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<font size="3" class="">Your explanation mostly makes sense, but...</font><br class="">
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<font size="3" class="">Failed with 4 nodes \u2026 failed with 2 nodes \u2026 not gonna try with 1 node. And this filesystem only has 32 disks, which I would imagine is not an especially large number compared to what some people reading this e-mail have in their filesystems.</font><br class="">
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<font size="3" class="">I thought that QOS (which I\u2019m using) was what would keep an mmrestripefs from overrunning the system \u2026 QOS has worked extremely well for us - it\u2019s one of my favorite additions to GPFS.</font><br class="">
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<font size="3" class="">Kevin</font><br class="">
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<font size="3" class="">On May 4, 2017, at 10:34 AM, Olaf Weiser <</font><a href="mailto:olaf.weiser@de.ibm.com" class=""><font size="3" color="blue" class=""><u class="">olaf.weiser@de.ibm.com</u></font></a><font size="3" class="">> wrote:</font><br class="">
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<font size="2" face="sans-serif" class="">no.. it is just in the code, because we have to avoid to run out of mutexs / block</font><font size="3" class=""><br class="">
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reduce the number of nodes -N down to 4 (2nodes is even more safer) ... is the easiest way to solve it for now....</font><font size="3" class=""><br class="">
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I've been told the real root cause will be fixed in one of the next ptfs .. within this year ..
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<font size="2" face="sans-serif" class="">this warning messages itself should appear every time.. but unfortunately someone coded, that it depends on the number of disks (NSDs).. that's why I suspect you did'nt see it before<br class="">
but the fact , that we have to make sure, not to overrun the system by mmrestripe remains.. to please lower the -N number of nodes to 4 or better 2
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(even though we know.. than the mmrestripe will take longer)</font><font size="3" class=""><br class="">
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From: </font><font size="1" face="sans-serif" class="">"Buterbaugh, Kevin L" <</font><a href="mailto:Kevin.Buterbaugh@Vanderbilt.Edu" class=""><font size="1" color="blue" face="sans-serif" class=""><u class="">Kevin.Buterbaugh@Vanderbilt.Edu</u></font></a><font size="1" face="sans-serif" class="">></font><font size="1" color="#5f5f5f" face="sans-serif" class=""><br class="">
To: </font><font size="1" face="sans-serif" class="">gpfsug main discussion list <</font><a href="mailto:gpfsug-discuss@spectrumscale.org" class=""><font size="1" color="blue" face="sans-serif" class=""><u class="">gpfsug-discuss@spectrumscale.org</u></font></a><font size="1" face="sans-serif" class="">></font><font size="1" color="#5f5f5f" face="sans-serif" class=""><br class="">
Date: </font><font size="1" face="sans-serif" class="">05/04/2017 05:26 PM</font><font size="1" color="#5f5f5f" face="sans-serif" class=""><br class="">
Subject: </font><font size="1" face="sans-serif" class="">[gpfsug-discuss] Well, this is the pits...</font><font size="1" color="#5f5f5f" face="sans-serif" class=""><br class="">
Sent by: </font><a href="mailto:gpfsug-discuss-bounces@spectrumscale.org" class=""><font size="1" color="blue" face="sans-serif" class=""><u class="">gpfsug-discuss-bounces@spectrumscale.org</u></font></a><font size="3" class=""><br class="">
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Hi All, <br class="">
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Another one of those, \u201cI can open a PMR if I need to\u201d type questions\u2026<br class="">
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We are in the process of combining two large GPFS filesystems into one new filesystem (for various reasons I won\u2019t get into here). Therefore, I\u2019m doing a lot of mmrestripe\u2019s, mmdeldisk\u2019s, and mmadddisk\u2019s.<br class="">
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Yesterday I did an \u201cmmrestripefs <old fs> -r -N <my 8 NSD servers>\u201d (after suspending a disk, of course). Worked like it should.<br class="">
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Today I did a \u201cmmrestripefs <new fs> -b -P capacity -N <those same 8 NSD servers>\u201d and got:<br class="">
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mmrestripefs: The total number of PIT worker threads of all participating nodes has been exceeded to safely restripe the file system. The total number of PIT worker threads, which is the sum of pitWorkerThreadsPerNode of the participating nodes, cannot exceed
31. Reissue the command with a smaller set of participating nodes (-N option) and/or lower the pitWorkerThreadsPerNode configure setting. By default the file system manager node is counted as a participating node.<br class="">
mmrestripefs: Command failed. Examine previous error messages to determine cause.<br class="">
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So there must be some difference in how the \u201c-r\u201d and \u201c-b\u201d options calculate the number of PIT worker threads. I did an \u201cmmfsadm dump all | grep pitWorkerThreadsPerNode\u201d on all 8 NSD servers and the filesystem manager node \u2026 they all say the same thing:<br class="">
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pitWorkerThreadsPerNode 0<br class="">
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Hmmm, so 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 > 31?!? I\u2019m confused...<br class="">
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\u2014<br class="">
Kevin Buterbaugh - Senior System Administrator<br class="">
Vanderbilt University - Advanced Computing Center for Research and Education</font><font size="3" color="blue" class=""><u class=""><br class="">
</u></font><a href="mailto:Kevin.Buterbaugh@vanderbilt.edu" class=""><font size="3" color="blue" class=""><u class="">Kevin.Buterbaugh@vanderbilt.edu</u></font></a><font size="3" class="">- (615)875-9633<br class="">
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