[ntp:questions] a couple of questions

Folkert van Heusden folkert at vanheusden.com
Thu Nov 4 10:12:47 UTC 2004


Hi,

I've got a couple of questions.

1. what is the mtbf for a typical atomic clock? how often do these
devices fail? 2. when one uses an atomic clock, should one still use 3
of them because of fals tickers? or are atomic clocks reliable enough?
3. when using a pc as a kind of proxy, e.g.: it runs ntpd and connects
to 4 upstream ntp-servers, and all clients connect to this one system.
should one still preferably have 3 proxy-systems instead of 1? or only
when the upstream link is likely to be broken in some cases? 4. what is
the mtbf of a typical gps receiver?
5. if one has 3 time servers in an intranet, does it make sense to hook
up a gps receiver to each of them, even if the gps receivers are
installed at the same location on the roof of the building? 6. what is
the mtbf of a typical dcf77 receiver?
7. if one has 3 time servers in an intranet, does it make sense to hook
up a dcf77 receiver to each of them, even if the dcf77 receivers are
installed at the same location in the building? 8. are there any
documents describing best practices for setting up a time server for an
intranet? i'm currently looking into an intranet with aprox 5000
computers (windows/novell/linux/solaris) that need to sync themselves.
8. about peering servers: should they peer if they use the same
upstream-servers? or in any case?

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