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I recently added a third ntpsec RPI to my little homebrew cluster. I
have them all peering with each other, along with each having a few
'outside' stratum one servers in the mix (different ones on each
device). so, I have<br>
<br>
a-ntpsec, which peers with b- and c-ntpsec (along with 'outsiders')<br>
b-ntpsec, which peers with a- and c-ntpsec. As above.<br>
c-ntpsec, which peers with a- and b-ntpsec. As above.<br>
<br>
Is this a reasonable setup, or is there a potential for it to
amplify errors/instability rather than mitigating it? I realize that
in time, I should find out from my ntpviz graphs what the effect
will be, but if this is a misguided setup, I'd rather nip it in the
bud sooner than later.<br>
<br>
All three are in a thermally insulated box, so temperature is
beginning to stabilize after a day or so since I wired it all up.
The graphs beyond 12 hours look pretty horrendous at the moment
because of this...<br>
<br>
<a class="moz-txt-link-freetext" href="https://ntpsec.anastrophe.com/a-1hr/index.html">https://ntpsec.anastrophe.com/a-1hr/index.html</a><br>
<a class="moz-txt-link-freetext" href="https://ntpsec.anastrophe.com/b-1hr/index.html">https://ntpsec.anastrophe.com/b-1hr/index.html</a><br>
<a class="moz-txt-link-freetext" href="https://ntpsec.anastrophe.com/c-1hr/index.html">https://ntpsec.anastrophe.com/c-1hr/index.html</a><br>
<br>
All three are RPI3B+, Raspbian 9.9, ntpsec 1.1.4 from repo, gpsd
3.19-dev from repo. a- and c- have the same ublox neo-M8T board, b-
has an adafruit hat. Interestingly, the brand new RPI (c-ntpsec) has
a significantly higher and less stable frequency offset from the
other two. I'm wondering if this is a function of the clock crystal
being brand new rather than a year+ old, or whether it's just the
'luck of the draw'.<br>
<br>
Photo of the setup <a class="moz-txt-link-freetext" href="https://i.imgur.com/WTGA8xU.jpg">https://i.imgur.com/WTGA8xU.jpg</a> - I gotta brag a
little on my obsessive-compulsive hobby...<br>
<pre class="moz-signature" cols="72">--
Paul Theodoropoulos
<a class="moz-txt-link-abbreviated" href="http://www.anastrophe.com">www.anastrophe.com</a></pre>
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