<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 ... are the biggies.</span><br><br><span style=" font-size:10pt;font-family:sans-serif">Apparently, --iohist
may sometimes distinguish some metadata as "inode", "logData",
... 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:
</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">09/10/2018
03:12 PM</span><br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Subject:
</span><span style=" font-size:9pt;font-family:sans-serif">[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><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’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><br><br><span style=" font-size:8pt;font-family:Helvetica">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><br><br><span style=" font-size:8pt;font-family:Helvetica">11:22:13.931117
W inode 4:299844163
1 0.448 srv dm-12
<redacted></span><br><span style=" font-size:8pt;font-family:Helvetica">11:22:13.932344
R metadata 4:36659676
4 0.307 srv dm-12
<redacted></span><br><span style=" font-size:8pt;font-family:Helvetica">11:22:13.932005
W logData 4:49676176
1 0.726 srv dm-12
<redacted> </span><br><br><span style=" font-size:8pt;font-family:Helvetica">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><br><br><span style=" font-size:8pt;font-family:Helvetica">This is on a filesystem
that currently uses 512 byte inodes, if that matters. Thanks…</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>