I'm not at that scale, but I've seen some fairly impressive performance searching through a friend's NetXMS system with a couple years of verbose syslog and monitoring to go through. ----- Mike Hammett Intelligent Computing Solutions http://www.ics-il.com Midwest Internet Exchange http://www.midwest-ix.com ----- Original Message ----- From: "Manuel Marín" <mmg@transtelco.net> To: "NANOG" <nanog@nanog.org> Sent: Monday, June 6, 2016 9:18:07 AM Subject: Monitoring system recommendation Dear Nanog community We are currently planning to upgrade our monitoring system (Opsview) due to scalability issues and I was wondering what do you recommend for monitoring 5000 hosts and 35000 services. We would like to use a monitoring system that is compatible with the nagios plugin format, however we are not sure if systems like Icinga/Shinken/Op5 are the way to go. Is someone using systems like Op5 or Icinga2 for monitoring > 5000 hosts? Would you recommend commercial systems like Sevone, Zabbix, etc instead of open source ones? Your input is really appreciated it Thank you and have a great day Regards