By setting the frequency to 1 minute you will not be sent a message every one minute while the device is down.
The alert evaluation frequency is how often the alert criteria is checked against all of the systems in your database. The thing to understand is that the alert engine is completely independent of the polling engine. The polling engine just polls devices to determine their status. As a completely separate process the alerting engine goes through and checks for the criteria that you have specified in your alert definitions.
By setting an alert evaluation frequency you are telling the system how often you would like it to go though and check for anything that meets that criteria. Generally you don't want this set more frequently than your polling intervals because you will be wasting cycles checking the same data-points.
Because the advanced alerts that you configure are stateful, they should only send you a message once when it triggers. You can setup escalations if you want additional notifications for the same alert but that is something that isn't configured by default.
Hope this all helps!
Hi byrona, thanks for the clarify. However, I was curious about that i set the polling engine poll every 5 minutes, then set the alert evaluation frequency for every 6 minutes. It is ok for this configuration? Furthermore, i received 5 same sms at a same time when an alert had trigger. What probably is this cause?
Having polling set to every 5 minutes and alert evaluation set to every 6 minutes should not cause a problem.
When you received the 5 SMS messages, was there only one alert triggered for one device?
Hi byrona, right now i had change my configure
poll every 330 second
collect statistic every 5 min
evaluate every 6 mins
is this ok for this config?cause i really confuse about how to set those timer.
Ya, i received the message that only trigger by one alert. One more question, i set my condition trigger the alert when status equal to down n node name equal to my server. however i will get an alert sms indicated that status is unreachable. FYI, the server had restart due to windows update, is this probably the problem that cause send multiple message at a same time?and the alert was send within 1 minute. Hope u get what i means. thanks