<font size=3 face="Arial">My first guess would be the network between
the NSD client and NSD server. netstat and ethtool may help to determine
where the cause may lie, if it is on the NSD client. Obviously a
switch on the network could be another source of the problem.</font><br><br><font size=3 face="sans-serif">Fred<br>__________________________________________________<br>Fred Stock | IBM Pittsburgh Lab | 720-430-8821<br>stockf@us.ibm.com</font><br><br><br><br><font size=1 color=#5f5f5f face="sans-serif">From:
</font><font size=1 face="sans-serif">"Buterbaugh, Kevin
L" <Kevin.Buterbaugh@Vanderbilt.Edu></font><br><font size=1 color=#5f5f5f face="sans-serif">To:
</font><font size=1 face="sans-serif">gpfsug main discussion
list <gpfsug-discuss@spectrumscale.org></font><br><font size=1 color=#5f5f5f face="sans-serif">Date:
</font><font size=1 face="sans-serif">10/04/2018 03:55 PM</font><br><font size=1 color=#5f5f5f face="sans-serif">Subject:
</font><font size=1 face="sans-serif">[gpfsug-discuss]
Long I/O's on client but not on NSD server(s)</font><br><font size=1 color=#5f5f5f face="sans-serif">Sent by:
</font><font size=1 face="sans-serif">gpfsug-discuss-bounces@spectrumscale.org</font><br><hr noshade><br><br><br><font size=3>Hi All, </font><br><br><font size=3>What does it mean if I have a few dozen very long I/O\u2019s
(50 - 75 seconds) on a gateway as reported by \u201cmmdiag \u2014iohist\u201d and they
all reference two of my eight NSD servers\u2026</font><br><br><font size=3>\u2026 but then I go to those 2 NSD servers and I don\u2019t see
any long I/O\u2019s at all?</font><br><br><font size=3>In other words, if the problem (this time) were the backend
storage, I should see long I/O\u2019s on the NSD servers, right?</font><br><br><font size=3>I\u2019m 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) \u2026 thoughts???</font><br><br><font size=3>Thanks in advance\u2026</font><br><br><font size=3>\u2014</font><br><font size=3>Kevin Buterbaugh - Senior System Administrator</font><br><font size=3>Vanderbilt University - Advanced Computing Center for
Research and Education</font><br><a href="mailto:Kevin.Buterbaugh@vanderbilt.edu"><font size=3 color=blue><u>Kevin.Buterbaugh@vanderbilt.edu</u></font></a><font size=3>- (615)875-9633</font><br><br><br><tt><font size=2>_______________________________________________<br>gpfsug-discuss mailing list<br>gpfsug-discuss at spectrumscale.org<br></font></tt><a href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss"><tt><font size=2>http://gpfsug.org/mailman/listinfo/gpfsug-discuss</font></tt></a><tt><font size=2><br></font></tt><br><br><BR>