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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:black'>Hi,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:black'>Typical servers are Dell PowerEdge 2950s with single quad-core
Intel X5365 @ 3.00GHz processors and 16GB RAM, onboard PERC 5/I RAID
controllers, 146GB, 2.5”, 10K-RPM SAS drives for /, /boot, and swap (32GB
swap partition).<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:black'>Using IOZONE v3.283 (detailed info below), with these types of
commands:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:black'>$ ./iozone –Ra –g 2G –b ~/iozone.xls –f /mnt/gfsvol1/iozone/iozone.tmp<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:black'>That runs the automatic matrix of IOZONE tests with test file
sizes up to 2GB, and it skips small read/write requests for large files for time’s
sake. It is running single thread, single I/O file. I suspect our
results will look somewhat different if I spin up more parallel threads and try
to match IOZONE’s testing thread-count to our application’s.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoPlainText><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:black'>The bottom line, however, is really around RHCS and GFS. I’m
hoping to find some good pointers for performance tuning, and monitoring and
measurement to feed back into the tuning, best practices, etc. There is a
presentation at <a
href="http://people.redhat.com/czinzili/docs/Summit07presentation_GFS_Best_Practices_Final.pdf"><span
style='color:black'>http://people.redhat.com/czinzili/docs/Summit07presentation_GFS_Best_Practices_Final.pdf</span></a>
which covers some things, but it’s pretty light. It did, however,
point me at this mailing list, so there’s a golden nugget!<o:p></o:p></span></p>
<p class=MsoPlainText><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:black'><br>
Thanks,<o:p></o:p></span></p>
<p class=MsoPlainText><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:black'>- K<o:p></o:p></span></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<p class=MsoPlainText><o:p> </o:p></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
linux-cluster-bounces@redhat.com [mailto:linux-cluster-bounces@redhat.com] <b>On
Behalf Of </b>Gary Romo<br>
<b>Sent:</b> Wednesday, December 19, 2007 11:01 AM<br>
<b>To:</b> linux clustering<br>
<b>Cc:</b> linux-cluster@redhat.com; linux-cluster-bounces@redhat.com<br>
<b>Subject:</b> Re: [Linux-cluster] newbie question about RHCS/GFS stability
and performance<o:p></o:p></span></p>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'><br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>I will be using
iozone at a later time. Can you provide some syntax examples of what you
are running?</span> <br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Thanks.</span> <br>
<br>
<span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Gary Romo<br>
IBM Global Technology Services<br>
303.458.4415<br>
Email: garromo@us.ibm.com<br>
Pager:1.877.552.9264<br>
Text message: gromo@skytel.com</span> <br>
<br>
<o:p></o:p></p>
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