Hi Luca, 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.
If there are some call recording, you can configure Asterisk to make it in a temp location, a RAM Disk in Linux. If you make hard usage of the AstDB file, you can copy it to RAM too, to avoid read/write to the disk. Please, read this post about lsof: http://0xfe.blogspot.com.ar/2006/03/troubleshooting-unix-systems-with-lsof.html You can view something weird in Asterisk logs when high load ? Maybe enable debug ? You can install and setup "atop". Then you can review the system status after the load peak and drill down, just to the problem. Finally, for troubleshooting IO Wait on a Linux system, you can view this post: http://bencane.com/2012/08/06/troubleshooting-high-io-wait-in-linux/ Cheers 2016-11-23 12:32 GMT-03:00 Luca Pradovera <luca.pradov...@gmail.com>: > Hello! > 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. > On CentOS 6, load increases and decreases linearly and the machine never > slows down. > > Asterisk version is 1.8.22.0, which is if course quite old (but it is what > is installed). > The CentOS 6 box actually has less RAM (8 Gb vs. 16 Gb), but other than > that they are exactly identical in hardware configuration. > > I checked the usual culprits, but to no avail. Is this a known issue? > > Best regards, > > Luca > > -- > _____________________________________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > Check out the new Asterisk community forum at: https://community.asterisk. > org/ > > New to Asterisk? Start here: > https://wiki.asterisk.org/wiki/display/AST/Getting+Started > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > -- GnuPG Key ID: 0x39BCA9D8 https://www.github.com/mefhigoseth ...:::[ God Rulz ! ]:::...
-- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- Check out the new Asterisk community forum at: https://community.asterisk.org/ New to Asterisk? Start here: https://wiki.asterisk.org/wiki/display/AST/Getting+Started asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users