I have access to two external stratum-1 ntp-servers (one GPS and one with both
GPS and long wave radio), and one company internal stratum-1/GPS, plus I'm
considering if we should have a second company internal stratum-1. The external
ntp-servers are hosted at trusted sister organizations.
So we have
* ntp1 (GPS, sister organization 1)
* ntp2 (GPS + radio, sister organization 2)
* ntp3 (GPS, company internal)
* ntp4 (not yet existing, do we need it? should we use something else than GPS?)
and I'm wondering how best to distribute time for our servers. We use Red Hat
Enterprise Virtualization. with kvm-clock for most servers, and this seems to
have been keeping very good time so far. Will it be safe to use virtual
machines for stratum-2, and connect all servers to these ?
Should our stratum-2 servers all be connected to ntp1-4, or is it better to
have server1-ntp1, server2-ntp2, etc.. to make sure they don't all run off the
same clock source? i.e. should we for server1 have ntp.conf with:
server ntp1 prefer
server server2
server server3
server server4
or:
server ntp1 prefer
server ntp2
server ntp3
server ntp4
I can't point all our ntp-clients to the sister organizations stratum-1
servers, but I think our internal ntp1-appliances should handle the load of all
our devices (a few thousand devices). Will it be best to point the ntp-clients
to:
server ntp3 prefer
server ntp4 prefer
server server1
server server2
server server3
server server4
or just use the stratum2 servers?
-jf
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