Every now and then, a host in your Zabbix system will turn unavailable. It results in notifications like this:
Trigger: Zabbix agent on myhost is unreachable for 5 minutes
Trigger status: PROBLEM
And logs like this:
1461:20140808:074300.517 Zabbix agent item "vfs.fs.size[/home/deploy/sites/mc/shared/voip,free]" on host "myhost" failed: first network error, wait for 15 seconds
1466:20140808:074345.134 temporarily disabling Zabbix agent checks on host "myhost": host unavailable
What could be a cause? No, it’s not because a host could not be reached. That would be too easy.