<span style=" font-size:10pt;font-family:sans-serif">1. (Guessing) perhaps
it was considered useful to distinguish inode traffic from log traffic
and just lump other metadata together.</span><br><span style=" font-size:10pt;font-family:sans-serif">2. A 512 byte
inode has space for up to 384 bytes of data-in-inode data. (Says
tsdbfs )<br></span><br><br><br><br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">From:
</span><span style=" font-size:9pt;font-family:sans-serif">"Buterbaugh,
Kevin L" <Kevin.Buterbaugh@Vanderbilt.Edu></span><br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">To:
</span><span style=" font-size:9pt;font-family:sans-serif">gpfsug
main discussion list <gpfsug-discuss@spectrumscale.org></span><br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Date:
</span><span style=" font-size:9pt;font-family:sans-serif">09/11/2018
11:49 AM</span><br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Subject:
</span><span style=" font-size:9pt;font-family:sans-serif">Re:
[gpfsug-discuss] RAID type for system pool</span><br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Sent
by: </span><span style=" font-size:9pt;font-family:sans-serif">gpfsug-discuss-bounces@spectrumscale.org</span><br><hr noshade><br><br><br><span style=" font-size:12pt">Hi Marc, </span><br><br><span style=" font-size:12pt">Understood … I’m just trying to understand
why some I/O’s 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…</span><br><br><span style=" font-size:12pt">Kevin</span><br><br><span style=" font-size:12pt">On Sep 11, 2018, at 9:12 AM, Marc A Kaplan
<</span><a href="mailto:makaplan@us.ibm.com"><span style=" font-size:12pt;color:blue"><u>makaplan@us.ibm.com</u></span></a><span style=" font-size:12pt">>
wrote:</span><br><br><span style=" font-size:10pt;font-family:sans-serif">Metadata is anything
besides the data contents of your files.<br>Inodes, directories, indirect blocks, allocation maps, log data ... are
the biggies.</span><span style=" font-size:12pt"><br></span><span style=" font-size:10pt;font-family:sans-serif"><br>Apparently, --iohist may sometimes distinguish some metadata as "inode",
"logData", ... that doesn't mean those aren't metadata
also.</span><span style=" font-size:12pt"><br><br><br><br></span><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif"><br>From: </span><span style=" font-size:9pt;font-family:sans-serif">"Buterbaugh,
Kevin L" <</span><a href="mailto:Kevin.Buterbaugh@Vanderbilt.Edu"><span style=" font-size:9pt;color:blue;font-family:sans-serif"><u>Kevin.Buterbaugh@Vanderbilt.Edu</u></span></a><span style=" font-size:9pt;font-family:sans-serif">></span><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif"><br>To: </span><span style=" font-size:9pt;font-family:sans-serif">gpfsug
main discussion list <</span><a href="mailto:gpfsug-discuss@spectrumscale.org"><span style=" font-size:9pt;color:blue;font-family:sans-serif"><u>gpfsug-discuss@spectrumscale.org</u></span></a><span style=" font-size:9pt;font-family:sans-serif">></span><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif"><br>Date: </span><span style=" font-size:9pt;font-family:sans-serif">09/10/2018
03:12 PM</span><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif"><br>Subject: </span><span style=" font-size:9pt;font-family:sans-serif">[gpfsug-discuss]
RAID type for system pool</span><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif"><br>Sent by: </span><a href="mailto:gpfsug-discuss-bounces@spectrumscale.org"><span style=" font-size:9pt;color:blue;font-family:sans-serif"><u>gpfsug-discuss-bounces@spectrumscale.org</u></span></a><span style=" font-size:12pt"><br></span><hr noshade><span style=" font-size:12pt"><br><br><br></span><span style=" font-size:12pt;font-family:Helvetica"><b><br>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><span style=" font-size:12pt;font-family:Helvetica"><b><br>Subject: Re: [gpfsug-discuss] RAID type for system pool<br>Date: </b>September 10, 2018 at 11:35:05 AM CDT<b><br>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><span style=" font-size:12pt"><br></span><span style=" font-size:8pt;font-family:Helvetica"><br>Hi All,</span><span style=" font-size:12pt"><br></span><span style=" font-size:8pt;font-family:Helvetica"><br>So while I’m waiting for the purchase of new hardware to go thru, I’m
trying to gather more data about the current workload. One of the
things I’m trying to do is get a handle on the ratio of reads versus writes
for my metadata.</span><span style=" font-size:12pt"><br></span><span style=" font-size:8pt;font-family:Helvetica"><br>I’m using “mmdiag —iohist” … in this case “dm-12” is one of my metadataOnly
disks and I’m running this on the primary NSD server for that NSD. I’m
seeing output like:</span><span style=" font-size:12pt"><br></span><span style=" font-size:8pt;font-family:Helvetica"><br>11:22:13.931117 W inode 4:299844163
1 0.448 srv dm-12
<redacted><br>11:22:13.932344 R metadata 4:36659676
4 0.307 srv dm-12
<redacted><br>11:22:13.932005 W logData 4:49676176
1 0.726 srv dm-12
<redacted> </span><span style=" font-size:12pt"><br></span><span style=" font-size:8pt;font-family:Helvetica"><br>And I’m confused as to the difference between “inode” and “metadata”
(I at least _think_ I understand “logData”)?!? The man page for
mmdiag doesn’t help and I’ve not found anything useful yet in my Googling.</span><span style=" font-size:12pt"><br></span><span style=" font-size:8pt;font-family:Helvetica"><br>This is on a filesystem that currently uses 512 byte inodes, if that matters.
Thanks…</span><span style=" font-size:12pt"><br></span><span style=" font-size:8pt;font-family:Helvetica"><br>Kevin</span><tt><span style=" font-size:10pt"><br>_______________________________________________<br>gpfsug-discuss mailing list<br>gpfsug-discuss at </span></tt><a href="http://spectrumscale.org"><tt><span style=" font-size:10pt;color:blue"><u>spectrumscale.org</u></span></tt></a><span style=" font-size:12pt;color:blue"><u><br></u></span><a href="https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fgpfsug.org%2Fmailman%2Flistinfo%2Fgpfsug-discuss&data=02%7C01%7CKevin.Buterbaugh%40vanderbilt.edu%7C2dbbb1fe9f5a4b80aa6b08d617f0a664%7Cba5a7f39e3be4ab3b45067fa80faecad%7C0%7C0%7C636722719686349116&sdata=QfIeBZZ5%2Brpqqw1XL0cnIGqzswhtX3mYfJuTKSGpDEM%3D&reserved=0"><tt><span style=" font-size:10pt;color:blue"><u>http://gpfsug.org/mailman/listinfo/gpfsug-discuss</u></span></tt></a><span style=" font-size:12pt"><br><br><br><br>_______________________________________________<br>gpfsug-discuss mailing list<br>gpfsug-discuss at </span><a href="http://spectrumscale.org"><span style=" font-size:12pt;color:blue"><u>spectrumscale.org</u></span></a><span style=" font-size:12pt;color:blue"><u><br></u></span><a href="https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fgpfsug.org%2Fmailman%2Flistinfo%2Fgpfsug-discuss&data=02%7C01%7CKevin.Buterbaugh%40vanderbilt.edu%7C2dbbb1fe9f5a4b80aa6b08d617f0a664%7Cba5a7f39e3be4ab3b45067fa80faecad%7C0%7C0%7C636722719686369131&sdata=uOPawxUhx4Wvxja5%2FLvJJMpAHj3uRb0Q1eiogmRXGgw%3D&reserved=0"><span style=" font-size:12pt;color:blue"><u>https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fgpfsug.org%2Fmailman%2Flistinfo%2Fgpfsug-discuss&data=02%7C01%7CKevin.Buterbaugh%40vanderbilt.edu%7C2dbbb1fe9f5a4b80aa6b08d617f0a664%7Cba5a7f39e3be4ab3b45067fa80faecad%7C0%7C0%7C636722719686369131&sdata=uOPawxUhx4Wvxja5%2FLvJJMpAHj3uRb0Q1eiogmRXGgw%3D&reserved=0</u></span></a><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>