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Hi Marc,
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<div class="">Understood \u2026 I\u2019m just trying to understand why some I/O\u2019s are flagged as metadata, while others are flagged as inode?!? Since this filesystem uses 512 byte inodes, there is no data content from any files involved (for a metadata only disk), correct?
Thanks\u2026</div>
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<div class="">Kevin</div>
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<div class="">On Sep 11, 2018, at 9:12 AM, Marc A Kaplan <<a href="mailto:makaplan@us.ibm.com" class="">makaplan@us.ibm.com</a>> wrote:</div>
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<div class=""><span style=" font-size:10pt;font-family:sans-serif" class="">Metadata is anything besides the data contents of your files.</span><br class="">
<span style=" font-size:10pt;font-family:sans-serif" class="">Inodes, directories, indirect blocks, allocation maps, log data ... are the biggies.</span><br class="">
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<span style=" font-size:10pt;font-family:sans-serif" class="">Apparently, --iohist may sometimes distinguish some metadata as "inode", "logData", ... that doesn't mean those aren't metadata also.</span><br class="">
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<span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif" class="">From: </span><span style=" font-size:9pt;font-family:sans-serif" class="">"Buterbaugh, Kevin L" <<a href="mailto:Kevin.Buterbaugh@Vanderbilt.Edu" class="">Kevin.Buterbaugh@Vanderbilt.Edu</a>></span><br class="">
<span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif" class="">To: </span><span style=" font-size:9pt;font-family:sans-serif" class="">gpfsug main discussion list <<a href="mailto:gpfsug-discuss@spectrumscale.org" class="">gpfsug-discuss@spectrumscale.org</a>></span><br class="">
<span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif" class="">Date: </span><span style=" font-size:9pt;font-family:sans-serif" class="">09/10/2018 03:12 PM</span><br class="">
<span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif" class="">Subject: </span><span style=" font-size:9pt;font-family:sans-serif" class="">[gpfsug-discuss] RAID type for system pool</span><br class="">
<span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif" class="">Sent by: </span><span style=" font-size:9pt;font-family:sans-serif" class=""><a href="mailto:gpfsug-discuss-bounces@spectrumscale.org" class="">gpfsug-discuss-bounces@spectrumscale.org</a></span><br class="">
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<span style=" font-size:12pt;font-family:Helvetica" class=""><b class="">From: </b>
</span><a href="mailto:gpfsug-discuss-owner@spectrumscale.org" class=""><span style=" font-size:12pt;color:blue;font-family:Helvetica" class=""><u class="">gpfsug-discuss-owner@spectrumscale.org</u></span></a><br class="">
<span style=" font-size:12pt;font-family:Helvetica" class=""><b class="">Subject: Re: [gpfsug-discuss] RAID type for system pool</b></span><br class="">
<span style=" font-size:12pt;font-family:Helvetica" class=""><b class="">Date: </b>
September 10, 2018 at 11:35:05 AM CDT</span><br class="">
<span style=" font-size:12pt;font-family:Helvetica" class=""><b class="">To: </b>
</span><a href="mailto:klb@accre.vanderbilt.edu" class=""><span style=" font-size:12pt;color:blue;font-family:Helvetica" class=""><u class="">klb@accre.vanderbilt.edu</u></span></a><br class="">
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<span style=" font-size:8pt;font-family:Helvetica" class="">Hi All,</span><span style=" font-size:12pt" class=""></span><br class="">
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<span style=" font-size:8pt;font-family:Helvetica" class="">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. 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 class="">
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<span style=" font-size:8pt;font-family:Helvetica" class="">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. I\u2019m seeing output like:</span><br class="">
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<span style=" font-size:8pt;font-family:Helvetica" class="">11:22:13.931117 W inode 4:299844163 1 0.448 srv dm-12 <redacted></span><br class="">
<span style=" font-size:8pt;font-family:Helvetica" class="">11:22:13.932344 R metadata 4:36659676 4 0.307 srv dm-12 <redacted></span><br class="">
<span style=" font-size:8pt;font-family:Helvetica" class="">11:22:13.932005 W logData 4:49676176 1 0.726 srv dm-12 <redacted>
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<span style=" font-size:8pt;font-family:Helvetica" class="">And I\u2019m confused as to the difference between \u201cinode\u201d and \u201cmetadata\u201d (I at least _think_ I understand \u201clogData\u201d)?!? The man page for mmdiag doesn\u2019t help and I\u2019ve not found anything useful yet in my
Googling.</span><br class="">
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<span style=" font-size:8pt;font-family:Helvetica" class="">This is on a filesystem that currently uses 512 byte inodes, if that matters. Thanks\u2026</span><br class="">
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<span style=" font-size:8pt;font-family:Helvetica" class="">Kevin</span><br class="">
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