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<p>Folks,<br>
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Please note Bryan's section on</div>
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<div class="moz-forward-container"> Notes about the new default
/farm_out that may affect your batch jobs</div>
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<div class="moz-forward-container">which you have all received. This
is a significant change. It is being done so that stdout can go to
a non-Lustre disk (SSD) with better performance for that kind of
usage, but with limited space.</div>
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<div class="moz-forward-container"> -- Mark<br>
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<div class="moz-forward-container">-------- Forwarded Message
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">Subject:
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<td>[Jlab-scicomp-briefs] Scientific Computing Farm
Maintenance Tuesday, May 26th 2020</td>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">Date: </th>
<td>Thu, 21 May 2020 19:07:22 +0000</td>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">From: </th>
<td>Bryan Hess <a class="moz-txt-link-rfc2396E" href="mailto:bhess@jlab.org"><bhess@jlab.org></a></td>
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<th valign="BASELINE" nowrap="nowrap" align="RIGHT">To: </th>
<td><a class="moz-txt-link-abbreviated" href="mailto:jlab-scicomp-briefs@jlab.org">jlab-scicomp-briefs@jlab.org</a>
<a class="moz-txt-link-rfc2396E" href="mailto:jlab-scicomp-briefs@jlab.org"><jlab-scicomp-briefs@jlab.org></a></td>
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On Tuesday, May 26th at 8am the farm will be paused for software
maintenance work and the ifarm machines will be rebooted. Once
the farm nodes have been updated, jobs will be released and
normal operations will resume. No action is required your part,
but please see the note below about /farm_out</div>
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The following changes will be made:</div>
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<ul>
<li>All farm and ifarm machines will be upgraded to newer
Lustre clients</li>
<li>Auger, SWIF, and other systems that rely on Lustre will be
shifted to newer Lustre servers to improve performance and
remove an operational dependency with the old Lustre system.</li>
<li><span style="color: rgb(0, 0, 0); font-family: Calibri,
Arial, Helvetica, sans-serif; font-size: 12pt;">The
/farm_out default location for farm job standard output
and standard error will be moved from Lustre to a new file
server better suited to the small IO operations of job
logging.</span><br>
</li>
</ul>
<div><br>
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<div>Notes about the new default /farm_out that may affect your
batch jobs:</div>
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<ul>
<li>standard output and standard error in /farm_out will be
limited to 1GB per user. Jobs that overrun this limit will
still run, but their stdout/stderr will be truncated. </li>
<li>files older than 10 days will be automatically removed.</li>
<li>/farm_out files that are large may be compressed or have
the middles trimmed to conserve space.<br>
</li>
</ul>
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<div>Reminder: End of life for CentOS 7.2/ Please run on CentOS
7.7</div>
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<ul>
<li>Jobs submitted using the "centos7" or "centos72" tags
will soon be unsupported. Please migrate your jobs to use
"centos77" or "general". The final 7.2 nodes from 2012 are
being operated on a best-effort basis and will be taken
out of service to make space for new hardware as needed. </li>
</ul>
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