| Re: [chrony-users] chronyd: Can' Synchronize WHY ? |
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On Fri, Sep 09, 2011 at 06:56:48AM +0000, thomas.schmid@xxxxxxxxx wrote:
> > The intervals for the two sources don't overlap, and there is no third
> > source which would overlap one of the two, so chrony gives up on them.
> Would you be so kind as to give me a "Dummie's Guid to "Overlap" ? I do
> not understand much of the values presented (dropped out of too math class
> too early :-)
There is an algoritm which is used to detect which server is "lying".
Here is a description for the one used by ntp, chrony is similar:
http://www.eecis.udel.edu/~mills/ntp/html/select.html
> MS Name/IP address Stratum Poll LastRx Last sample
> ============================================================================
> ^* <WAN-IP1> 1 6 67 -36us[ -463ms] +/- 85ms
> ^+ SU-Server3 2 6 42 +394ms[ +394ms] +/- 133ms
> ^+ <WAN-IP2> 2 6 35 +83ms[ +83ms] +/- 47ms
> ^? SU-Server1 0 7 10y +0ns[ +0ns] +/- 0ns
> ^? LU-Server 0 7 10y +0ns[ +0ns] +/- 0ns
Apparently the third server is no good either.
> chronyc> sourcestats
> 210 Number of sources = 5
> Name/IP Address NP NR Span Frequency Freq Skew Offset Std Dev
> ==============================================================================
> <WAN-IP1> 7 5 412 -1555.346 3022.979 -9053us 2933us
> SU-Server3 4 4 193 -2718.528 18920.604 +323ms 873us
> <WAN-IP2> 5 4 342 -2080.739 9921.691 +56ms 5675us
> SU-Server1 0 0 0 0.000 2000.000 +0ns 4000ms
> LU-Server 0 0 0 0.000 2000.000 +0ns 4000ms
Something is wrong, the skew values are extremely high. Usually, it's
just couple ppm.
Is the client running in a virtual machine?
--
Miroslav Lichvar
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