[ntp:questions] The libntp resumee...

Unruh unruh-spam at physics.ubc.ca
Tue Sep 9 18:39:53 UTC 2008


Uwe Klein <uwe_klein_habertwedt at t-online.de> writes:

>Unruh wrote:
>> 
>> Yes, that is with reference to the road. Car three should thus completely
>> ignore the other two cars and use his speedometer. 
>> 
>> Ie, put up a GPS receiver with a PPS and use that as your time source, and
>> ignore all the other ntp time sources, except perhaps as sanity checks (eg
>> if you r speedometer breaks you should get to know about it by occasionally
>> looking at the other cars)

>A)One GPS to each box or
>B) a single GPS with PPS line to all boxes?

Whichever you want. Up to you.

>A:
>Doesn't that impact reliability?

>You add the failure probability of a GPS-unit to each Box
>where one failure will make the whole system fail.

So, that is why ntp has backup servers. You have a single failure point
anyway-- the network. It goes down, and nothing can get the time. 



>What about doing startup of all involved boxes from the (outside)
>upstream timeserver?

???


>a question in this context:

>could I use something like this for a group of boxes to sync:

>server $external_upstream_host

>foreach box $neighbours
>	peer $box

>########################

>uwe





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