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</style><article id="node-453120" class="node node-logentry article ia-n clearfix" role="article"><header class="node-header"><h1 class="node-title">
<a href="https://logbooks.jlab.org/entry/3380300" rel="bookmark">gluon104, gluon110, and gluon49 ib ports switched</a>
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<p class="author-datetime">
Lognumber <a href="https://logbooks.jlab.org/entry/3380300" class="lognumber" data-lognumber="3380300">3380300</a>. Submitted by <a href="https://logbooks.jlab.org/user/davidl">davidl</a> on <time datetime="2016-02-16T17:16:52-0500" pubdate="pubdate">Tue, 02/16/2016 - 17:16</time>. </p>
<table class="field-vitals"><tr><th>Logbooks: </th><td><a href="https://logbooks.jlab.org/book/hdlog">HDLOG</a></td></tr></table></div>
<div class="logentry node-content">
<p>It has been noticed for a while that gluon104 seemed to have much slower network performance than the other farm nodes. A test with et_blaster confirmed that it was roughly 8 times slower than gluon106 when talking to gluon105. The infiniband switch showed that the port gluon104 was plugged into had logged (and was continuing to log) numerous "symbol errors". Rebooting gluon104 did not stop the behavior. </p>
<p>A physical examination showed that the triangular light on the ib switch for this port was orange, indicating an error. Unplugging and plugging the cable on both ends did not change the behavior. The cable was changed to port 14 on the ib switch. Once the link was reestablished, the triangular light was green and the admin web page served by the ib switch indicated no more symbol errors for this port. The et_blaster test now resulted in a comparable rate to gluon106.</p>
<p>While examining the switch, a few other orange lights were observed. Note that some lights would temporarily turn to orange and then back to green. Most lights were always green. Two that seemed to stay orange a significant amount of time were gluon110 and the gluon49 (landed) cables connected to ports 7 and 29 respectively. These were switched to ports 16 and 18 and seemed to behave better (solid green lights). Some other ports that spent significant time orange were not changed.</p>
<p>All changes were updated in the table at the bottom of the page:</p>
<p><a href="https://halldweb1.jlab.org/wiki/index.php/HallD_Online_IP_Name_And_Address_Conventions">https://halldweb1.jlab.org/wiki/index.php/HallD_Online_IP_Name_And_Addre...</a></p>
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