<div class="gmail_quote">Am 13. April 2012 11:58 schrieb Jerker Nyberg <span dir="ltr"><<a href="mailto:jerker@update.uu.se">jerker@update.uu.se</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div class="im">On Fri, 13 Apr 2012, Philip wrote:<br>
<br>
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">
Does anyone have an idea what could be the reason for such a bad<br></div>
performance? 22 Disks in a RAID10 should deliver *way* more throughput.<br>
</blockquote>
<br>
You may already have done so but you can check IO-utilization of the devices with the flag "-x" to "iostat" like for example "iostat -x 2" over a two second interval. Check percentage utilization in the "%util" column to the right. If you are closer to 100 than 0 then they (the disk subsystem) might actually be busy.<br>
<br>
--jerker<br>
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</blockquote></div><br>Here is the output (Outgoing bandwidth is currently at 380 Mbps):<br><br><br>Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util<br>sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00<br>
sdb 1.00 0.00 129.50 0.00 42624.00 0.00 329.14 1.53 10.97 3.63 47.00<br><br>avg-cpu: %user %nice %system %iowait %steal %idle<br> 0.06 0.00 0.53 2.82 0.00 96.60<br>
<br>Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util<br>sda 0.00 0.50 0.00 0.50 0.00 8.00 16.00 0.00 0.00 0.00 0.00<br>
sdb 1.00 0.00 184.00 47.50 64084.00 29412.00 403.87 1.81 8.29 2.16 50.00<br><br>avg-cpu: %user %nice %system %iowait %steal %idle<br> 0.06 0.00 0.59 2.50 0.00 96.85<br>
<br>Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util<br>sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00<br>
sdb 1.00 0.00 156.50 0.00 54944.00 0.00 351.08 1.30 8.28 2.62 41.00<br><br>avg-cpu: %user %nice %system %iowait %steal %idle<br> 0.21 0.00 0.48 1.61 0.00 97.70<br>