<br><br><div class="gmail_quote">On Thu, May 6, 2010 at 1:22 PM, JK <span dir="ltr"><<a href="mailto:jknapka@kneuro.net">jknapka@kneuro.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="im">On 5/6/2010 9:39 AM, Jim Kinney wrote:<br>
> Look through the hdparm variables and see if your drive(s) are in some<br>
> stupid/slow mode.<br>
<br>
<br>
</div>Begging the question: what counts as "stupid/slow"? I know that having<br>
DMA turned off, or set wrong, will kill performance. What else should<br>
be checked?<br></blockquote><div><br>Off the top of my head, you've found the list I recall. I haven't done perf tuning in a while so I'm fuzzy on details. Not sure if SATA drives eat the same params as the IDE ones you listed. May not even be hdparm.... <br>
<br>Thankfully I eat several times a day or I'd forget that too...<br></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br>
And Google leads me to:<br>
<br>
<a href="http://www.linuxclues.com/articles/20.htm" target="_blank">http://www.linuxclues.com/articles/20.htm</a><br>
<br>
In general, PIO modes are slowest and UDMA modes are fastest, correct?<br>
I remember a while back I had a 160G RAID array that was literally<br>
taking days to rebuild. Turned out the HDs were in like PIO3 or something.<br>
Changed to UDMA4 and the rebuild completed in fifteen minutes.<br>
<br>
-- JK<br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>-- <br>James P. Kinney III<br>Actively in pursuit of Life, Liberty and Happiness <br>Doing pretty well on all 3 pursuits <br><br>