On Sun, 2013-10-27 at 10:08 +0200, Itamar Heim wrote: Hi Itamar, That's the default behavior of Nagios - it send's out an email for all services which aren't in state "ok". As check_rhev3 plugin uses the API for all datacenter, cluster, storage, host, pool (and maybe vm) checks and during upgrade the API isn't available all service checks fail and so Nagios starts spamming. Yes, there are multiple ways how you can prevent mail floods. First of all I suggest to schedule downtimes in Nagios for all affected hosts/services. If a service has a scheduled downtime no notifications will be sent out during this time (no matter how often state changes). If using Icinga CGI gui or Icinga-Web instead of Nagios you can select multiple hosts and choose "Schedule Downtime For Checked Host(s) and All Services". I'm not sure if this is implemented in Nagios CGI gui as well or if you have to do this step for all hosts manually. An alternative to downtimes is disabling notification globally. But keep in mind that you want receive any notifications during this period - so e.g. a firewall outage isn't reported via email then either. Beside the handling of planed downtimes there's also a feature I recommend you to prevent email floods if the engine goes down unplanned: service dependencies (http://nagios.sourceforge.net/docs/3_0/dependencies.html) All my check_rhev3 service checks are members of service group "rhev" and I created a service dependency where no notifications are sent out (execution_failure_criteria n) if a service of service group rhev is in a state other then "ok" and the datacenter check "oVirt DC Status Check" on host "ovirt-engine.lab.ovido.at" is in state "unknown, critical or pending": define servicedependency { host_name ovirt-engine.lab.ovido.at service_description oVirt DC Status Check dependent_servicegroup_name rhev execution_failure_criteria n notification_failure_criteria u,c,p } With service dependencies for all check_rhev3 checks you will only receive 2 notifications when engine is down: 1 for the first service check failing and 1 for the DC Status Check (this checks is triggered automatically when using service dependencies and one of the services fails). Please let me know if you need further information (service dependencies can be quite confusing)... Regards, René