<span style=" font-size:10pt;font-family:sans-serif">Metadata is anything
besides the data contents of your files.</span><br><span style=" font-size:10pt;font-family:sans-serif">Inodes, directories,
indirect blocks, allocation maps, log data ... &nbsp;are the biggies.</span><br><br><span style=" font-size:10pt;font-family:sans-serif">Apparently, --iohist
may sometimes distinguish some metadata as &quot;inode&quot;, &quot;logData&quot;,
... &nbsp;that doesn't mean those aren't metadata also.</span><br><br><br><br><br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">From:
&nbsp; &nbsp; &nbsp; &nbsp;</span><span style=" font-size:9pt;font-family:sans-serif">&quot;Buterbaugh,
Kevin L&quot; &lt;Kevin.Buterbaugh@Vanderbilt.Edu&gt;</span><br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">To:
&nbsp; &nbsp; &nbsp; &nbsp;</span><span style=" font-size:9pt;font-family:sans-serif">gpfsug
main discussion list &lt;gpfsug-discuss@spectrumscale.org&gt;</span><br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Date:
&nbsp; &nbsp; &nbsp; &nbsp;</span><span style=" font-size:9pt;font-family:sans-serif">09/10/2018
03:12 PM</span><br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Subject:
&nbsp; &nbsp; &nbsp; &nbsp;</span><span style=" font-size:9pt;font-family:sans-serif">[gpfsug-discuss]
&nbsp;RAID type for system pool</span><br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Sent
by: &nbsp; &nbsp; &nbsp; &nbsp;</span><span style=" font-size:9pt;font-family:sans-serif">gpfsug-discuss-bounces@spectrumscale.org</span><br><hr noshade><br><br><br><br><span style=" font-size:12pt;font-family:Helvetica"><b>From: </b></span><a href="mailto:gpfsug-discuss-owner@spectrumscale.org"><span style=" font-size:12pt;color:blue;font-family:Helvetica"><u>gpfsug-discuss-owner@spectrumscale.org</u></span></a><br><span style=" font-size:12pt;font-family:Helvetica"><b>Subject: Re:
[gpfsug-discuss] RAID type for system pool</b></span><br><span style=" font-size:12pt;font-family:Helvetica"><b>Date: </b>September
10, 2018 at 11:35:05 AM CDT</span><br><span style=" font-size:12pt;font-family:Helvetica"><b>To: </b></span><a href="mailto:klb@accre.vanderbilt.edu"><span style=" font-size:12pt;color:blue;font-family:Helvetica"><u>klb@accre.vanderbilt.edu</u></span></a><br><br><span style=" font-size:8pt;font-family:Helvetica">Hi All,</span><span style=" font-size:12pt"></span><br><br><span style=" font-size:8pt;font-family:Helvetica">So while I\u2019m waiting
for the purchase of new hardware to go thru, I\u2019m trying to gather more
data about the current workload. &nbsp;One of the things I\u2019m trying to
do is get a handle on the ratio of reads versus writes for my metadata.</span><br><br><span style=" font-size:8pt;font-family:Helvetica">I\u2019m using \u201cmmdiag
\u2014iohist\u201d \u2026 in this case \u201cdm-12\u201d is one of my metadataOnly disks and
I\u2019m running this on the primary NSD server for that NSD. &nbsp;I\u2019m seeing
output like:</span><br><br><span style=" font-size:8pt;font-family:Helvetica">11:22:13.931117
&nbsp;W &nbsp; &nbsp; &nbsp; inode &nbsp; &nbsp;4:299844163 &nbsp; &nbsp;
&nbsp; &nbsp;1 &nbsp; &nbsp;0.448 &nbsp;srv &nbsp; dm-12 &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;redacted&gt;</span><br><span style=" font-size:8pt;font-family:Helvetica">11:22:13.932344
&nbsp;R &nbsp; &nbsp;metadata &nbsp; &nbsp;4:36659676 &nbsp; &nbsp; &nbsp;
&nbsp; 4 &nbsp; &nbsp;0.307 &nbsp;srv &nbsp; dm-12 &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;redacted&gt;</span><br><span style=" font-size:8pt;font-family:Helvetica">11:22:13.932005
&nbsp;W &nbsp; &nbsp; logData &nbsp; &nbsp;4:49676176 &nbsp; &nbsp; &nbsp;
&nbsp; 1 &nbsp; &nbsp;0.726 &nbsp;srv &nbsp; dm-12 &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &lt;redacted&gt; </span><br><br><span style=" font-size:8pt;font-family:Helvetica">And I\u2019m confused
as to the difference between \u201cinode\u201d and \u201cmetadata\u201d (I at least _think_
I understand \u201clogData\u201d)?!? &nbsp;The man page for mmdiag doesn\u2019t help
and I\u2019ve not found anything useful yet in my Googling.</span><br><br><span style=" font-size:8pt;font-family:Helvetica">This is on a filesystem
that currently uses 512 byte inodes, if that matters. &nbsp;Thanks\u2026</span><br><br><span style=" font-size:8pt;font-family:Helvetica">Kevin</span><br><tt><span style=" font-size:10pt">_______________________________________________<br>gpfsug-discuss mailing list<br>gpfsug-discuss at spectrumscale.org<br></span></tt><a href="http://gpfsug.org/mailman/listinfo/gpfsug-discuss"><tt><span style=" font-size:10pt">http://gpfsug.org/mailman/listinfo/gpfsug-discuss</span></tt></a><tt><span style=" font-size:10pt"><br></span></tt><br><br><BR>