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Physics&Astronomy _|___ Advanced Research _|____ Fax: +1(604)822-5324
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On Fri, 9 Feb 2018, Ariel Garcia wrote:

Assuming the servers are reachable/fine, would a short connection time of
2-3 seconds twice per day be enough to keep synchronized, or should i
rather enforce some minimum "on" time? (no big precision required, just
within 1s)

That should be ok. 1 second per 12 hours is a frequency error of 23
ppm. Unless the clock on the board is very unstable, its error should
stay well below that.

i'm not (so) worried by the precision, but rather if chrony manages to
"exploit" in a useful way the single query to each server that it will manage
to send in those 2-3 seconds window.
There seems to be an implicit "yes" in you answer :)

Sure it would use it. You should however tell chrony to do a burst when the it
comes online.

server SERVER1/2/3 auto_offline offline iburst presend 10 minpoll 4
initstepslew 3600 SERVER1/2/3

If you don't need chronyd to block the boot sequence until the clock
is stepped I'd suggest to drop the initstepslew directive

ok thanks for the hint!

BR, Ariel


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