<html><head></head><body><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div>It could mean a shortage of nsd server threads or a congested network. <br><div><br>Jim<br></div></div><div></div>
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On Thursday, October 4, 2018, 3:55:10 PM EDT, Buterbaugh, Kevin L <Kevin.Buterbaugh@Vanderbilt.Edu> wrote:
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Hi All,
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<div class="yiv4837672497">What does it mean if I have a few dozen very long I/O’s (50 - 75 seconds) on a gateway as reported by “mmdiag —iohist” and they all reference two of my eight NSD servers…</div>
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<div class="yiv4837672497">… but then I go to those 2 NSD servers and I don’t see any long I/O’s at all?</div>
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<div class="yiv4837672497">In other words, if the problem (this time) were the backend storage, I should see long I/O’s on the NSD servers, right?</div>
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<div class="yiv4837672497">I’m thinking this indicates that there is some sort of problem with either the client gateway itself or the network in between the gateway and the NSD server(s) … thoughts???</div>
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<div class="yiv4837672497">Thanks in advance…</div>
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<div class="yiv4837672497">Kevin Buterbaugh - Senior System Administrator</div>
<div class="yiv4837672497">Vanderbilt University - Advanced Computing Center for Research and Education</div>
<div class="yiv4837672497"><a rel="nofollow" ymailto="mailto:Kevin.Buterbaugh@vanderbilt.edu" target="_blank" href="mailto:Kevin.Buterbaugh@vanderbilt.edu" class="yiv4837672497">Kevin.Buterbaugh@vanderbilt.edu</a> - (615)875-9633</div>
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