check_fping reduced the overall overhead. I also made a ramdisk for the
status file. Much better overall ping times. I think the status file
on ramdisk was the silver bullet. Tried fping first and found it still
reported high latency. I suspect vmware is a little slow in writing to
the disk - although that doesn't seem to be a problem with the database
servers we have running there.
Marc Powell wrote:
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:nagios-users-
[EMAIL PROTECTED] On Behalf Of Reg
Sent: Tuesday, January 10, 2006 11:19 PM
To: [email protected]
Subject: [Nagios-users] Nagios check_ping times
I sporadically ( 1 or 2 times/day for 50 hosts) get check_ping
returing
average response times of 500ms plus resulting in false "critical"
alerts from Nagios. E.G.
PING CRITICAL - Packet loss = 0%, RTA = 535.87 ms
I'm running Suse 9.1 on VMWare ESX server. I DO NOT believe vmware to
be a factor because I also run smokeping on this virtual machine.
SmokePing sends 3 pings every 5 seconds to the same hosts and never
shows the 500ms+ latency that Nagios reports. During the course of a
typical day I get 80-100 of these "false alarms"
I suspect the problem is in the nagios daemon and how i have it
configured. When i run check_ping manually i can't reproduce the
500ms+. Are there any quick tests or diagnostics to help figure
what's
going on?
I have personally seen discrepancies between the results of fping tests
(which Smokeping uses) and ping tests (which check_ping uses), even to
the point where one works and the other doesn't. Though that last case
turned out to be a circuit issue, you might want to try using
check_fping to see if your problems go away. I can't imagine any
configuration that you could implement that would cause ping to falsely
report high latencies.
Another thing you might want to check is the load on the server at those
times. If the load is abnormally high it might delay ping's processing
of the return results.
--
Marc
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