<div dir="ltr"><div><div><div><div><div><div><div><div>Hi Luca,<br><br></div>IO delay maybe come from Hard Disk lattency. You can exec an "lsof " command to view what file asterisk proccess hold down when load spike.<br><br></div>If there are some call recording, you can configure Asterisk to make it in a temp location, a RAM Disk in Linux.<br><br></div>If you make hard usage of the AstDB file, you can copy it to RAM too, to avoid read/write to the disk.<br><br></div>Please, read this post about lsof: <a href="http://0xfe.blogspot.com.ar/2006/03/troubleshooting-unix-systems-with-lsof.html">http://0xfe.blogspot.com.ar/2006/03/troubleshooting-unix-systems-with-lsof.html</a><br><br></div>You can view something weird in Asterisk logs when high load ? Maybe enable debug ?<br><br></div>You can install and setup "atop". Then you can review the system status after the load peak and drill down, just to the problem.<br><br></div>Finally, for troubleshooting IO Wait on a Linux system, you can view this post: <a href="http://bencane.com/2012/08/06/troubleshooting-high-io-wait-in-linux/">http://bencane.com/2012/08/06/troubleshooting-high-io-wait-in-linux/</a><br><br></div>Cheers<br></div><div class="gmail_extra"><br><div class="gmail_quote">2016-11-23 12:32 GMT-03:00 Luca Pradovera <span dir="ltr"><<a href="mailto:luca.pradovera@gmail.com" target="_blank">luca.pradovera@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>Hello!</div>One of our customers has an issue where our load average on two of the boxes spikes on peak loads. What I got from testing is consistent with what they were reporting: on CentOS 7, the load spikes in hockey stick fashion, from 40-50% up to 200%, with very high iowait values.<br><div>On CentOS 6, load increases and decreases linearly and the machine never slows down.</div><div><br></div><div>Asterisk version is 1.8.22.0, which is if course quite old (but it is what is installed).</div><div>The CentOS 6 box actually has less RAM (8 Gb vs. 16 Gb), but other than that they are exactly identical in hardware configuration.</div><div><br></div><div>I checked the usual culprits, but to no avail. Is this a known issue?</div><div><br></div><div>Best regards,</div><div><br></div><div>Luca</div></div>
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