I am facing an issue of large offset coming from my GPS clock.
I am syncing RHEL 6.3 server by GPS clock through ntpd service. I have too servers of same type and both are syncing independently to the GPS Clock.
>ntpstat of server 1 gives,
>ntpstat of server 2 gives,
>ntpq -p of server 1 gives
>ntpq -p of server 2 gives, Ping -c 25 server1 gives, Ping -c 25 server2 gives,
Checked and found that ntp.conf file for identical for both the server.
Drift for server 1 is,
Drift for server 2 is,
After 15 mins when i check the same parameter, I found the following.
>ntpq -p of server 1 gives
>ntpq -p of server 2 gives,
>ntpstat of server 1 gives,
>ntpstat of server 2 gives,
I also found that there is a difference of 50 seconds between Linux system clock and GPS time in server 1 and 2.
I have run ntpdate -d (GPS Clock IP) and stop the NTPD service.
Run,
>hwclock -S in RHEL system and restarted NTPD service hoping that it will decrease the time between source and synch and NTPD will be able to adjust the time now.But unfortunately offset and jitter in increasing and RHEL servers' time lag increases w.r.t time.
I am finding difficult to understand the above happenings.Can somebody suggest how to troubleshoot the issue?
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Last edited by Don Cragun; 04-21-2017 at 06:48 PM..
Reason: Add CODE and ICODE tags.
You should always try to use at least three sources for NTP. The NTP daemon running on your system will throw away the time that has the highest drift and then average the remaining times to set the local system time. This will eliminate any one source that has drifted and reduce the risk of a slow network response.
In short, try using three sources and see if that fixes your problem.
It looks like there is something wrong with the time that is being served by server2 and it's configuration. This would be solved by having 3 credible sources.
If ntpq -p shows high and growing offsets, then usually it means that the clock control in the kernel does not work.
So it looks that both server1 and server2 are suffering.
But I wonder why ntpstat on server1 looks okay.?
Are server1 and server2 virtual? I have seen this on VMware ESX guests: the clock steppers are ignored, and the clock needs to be set on the VMware ESX host.
After a lot of brainstorming and consulting with some NTP expert I found the following.
NTP expert comment:
Now the question is How to fix the "BROKEN TIMEKEEPING OF LINUX System"?
Can some body help me out?
Last edited by Corona688; 05-08-2017 at 12:38 PM..
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