<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div><div>On Oct 12, 2010, at 3:34 PM, Robinson, Eric wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">
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<div dir="ltr" align="left"><font color="#0000ff" size="2" face="Verdana"><span class="365022822-12102010">I'm happy with the performance of our DRBD clusters.
They have scaled very well. One of our older drbd 8.0.14 clusters is pretty busy
these days servicing about 130 separate instances of MySQL and is seeing bursts
of 10-30% iowait, sometimes more, for maybe 3-4 seconds at a time. Someone told
me I could increase performance and reduce iowait by mounting the ext3
filesystem with the "noatime" option. Are there any dangers to be concerned
about when mounting a drbd device using the noatime option?</span></font></div>
<div><font color="#0000ff" size="2" face="Verdana"></font></div></div></blockquote><div><br></div><div>No more than any other kind of block device. If you're ok using noatime (and for a database you probably are) then using it with DRBD doesn't make a difference.</div><div><br></div></div></div></body></html>