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<p style="margin-top:0;margin-bottom:0">Thank you again Rick.</p>
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One last question, How safe is lfs_migrate? The man page on the installation says it's UNSAFE for possibly in-use files. The lustre manual doesn't have the same warning and says something about it being a bit more integrated with the MDS.</p>
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<p style="margin-top:0;margin-bottom:0"><a href="http://doc.lustre.org/lustre_manual.xhtml#dbdoclet.lfs_migrate" class="OWAAutoLink" id="LPlnk891471" previewremoved="true">http://doc.lustre.org/lustre_manual.xhtml#dbdoclet.lfs_migrate</a></p>
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How safe do you think this would be to run on some files on the OST with it disabled on the MDS and active jobs running on the cluster? I could do this by group, possibly to mitigate concerns of open files, if need be.</p>
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<font face="Calibri,sans-serif" size="2"><span style="font-size:11pt">Jason Williams</span></font></div>
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<font face="Calibri,sans-serif" size="2"><span style="font-size:11pt">Systems and Data Center Operations.<br>
Maryland Advanced Research Computing Center (MARCC)<br>
Johns Hopkins University</span></font></div>
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<font face="Calibri,sans-serif" size="2"><span style="font-size:11pt"><a href="mailto:jasonw@jhu.edu" target="_blank" rel="noopener noreferrer" id="LPNoLP"><font color="#0563C1">jasonw@jhu.edu</font></a></span></font></div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Mohr Jr, Richard Frank (Rick Mohr) <rmohr@utk.edu><br>
<b>Sent:</b> Monday, January 7, 2019 1:07 PM<br>
<b>To:</b> Jason Williams<br>
<b>Cc:</b> lustre-discuss@lists.lustre.org<br>
<b>Subject:</b> Re: [lustre-discuss] Full OST, any way of avoiding it without hanging?</font>
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> On Jan 7, 2019, at 12:53 PM, Jason Williams <jasonw@jhu.edu> wrote:<br>
> <br>
> As I have gone through the testing, I think you may be right. I think I disabled the OST in a slightly different way and that caused issues.<br>
> <br>
> Do you happen to know where I could find out a bit more about what the "lctl set_param osp.<osc_name>.max_create_count=0 command would do?<br>
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The Lustre manual has a section on removing MDTs/OSTs:<br>
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<a href="http://doc.lustre.org/lustre_manual.xhtml#dbdoclet.deactivating_mdt_ost" id="LPlnk53861" class="OWAAutoLink" previewremoved="true">http://doc.lustre.org/lustre_manual.xhtml#dbdoclet.deactivating_mdt_ost</a><br>
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--<br>
Rick Mohr<br>
Senior HPC System Administrator<br>
National Institute for Computational Sciences<br>
<a href="http://www.nics.tennessee.edu" id="LPlnk91673" class="OWAAutoLink" previewremoved="true">http://www.nics.tennessee.edu</a><br>
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