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<p class="MsoNormal"><span style="font-size:12.0pt">I don’t think you can do it directly, but you could probably use FileHeat to figure it out indirectly. Look at mmchconfig on how to set these:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">fileHeatLossPercent 20<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">fileHeatPeriodMinutes 1440<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Then you can run a fairly simple policy scan to dump out the file names and heat value, sort what’s the most active to the top. I’ve done this, and it can prove helpful:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">define(DISPLAY_NULL,[CASE WHEN ($1) IS NULL THEN '_NULL_' ELSE varchar($1) END])<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">rule fh1 external list 'fh' exec ''<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">rule fh2 list 'fh' weight(FILE_HEAT) show( DISPLAY_NULL(FILE_HEAT) || '|' || varchar(file_size) )<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Bob Oesterlin<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt">Sr Principal Storage Engineer, Nuance<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black"><gpfsug-discuss-bounces@spectrumscale.org> on behalf of "Buterbaugh, Kevin L" <Kevin.Buterbaugh@Vanderbilt.Edu><br>
<b>Reply-To: </b>gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><br>
<b>Date: </b>Monday, July 9, 2018 at 3:04 PM<br>
<b>To: </b>gpfsug main discussion list <gpfsug-discuss@spectrumscale.org><br>
<b>Subject: </b>[EXTERNAL] [gpfsug-discuss] What NSDs does a file have blocks on?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi All, <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I am still working on my issue of the occasional high I/O wait times and that has raised another question … I know that I can run mmfileid to see what files have a block on a given NSD, but is there a way to do the opposite? I.e. I want
to know what NSDs a single file has its’ blocks on? The mmlsattr command does not appear to show this information unless it’s got an undocumented option. Thanks…<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Kevin<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">—<o:p></o:p></p>
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<p class="MsoNormal">Kevin Buterbaugh - Senior System Administrator<o:p></o:p></p>
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<p class="MsoNormal">Vanderbilt University - Advanced Computing Center for Research and Education<o:p></o:p></p>
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<p class="MsoNormal"><a href="mailto:Kevin.Buterbaugh@vanderbilt.edu">Kevin.Buterbaugh@vanderbilt.edu</a> - (615)875-9633<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><br>
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<o:p></o:p></p>
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