2016-11-26 20:20 GMT+01:00 Anuj Wadehra <anujw_2...@yahoo.co.in>: > 1. If my ISP provider is providing me a pool of reliable NTP servers, should > I setup my own internal servers anyway or can I sync Cassandra nodes > directly to the ISP provided servers and select one of the servers as > preferred for relative clock synchronization?
Set up three ntp servers which uses the provider servers _and_ pool servers and sync your other machines from these servers (and maybe get gps receivers for your ntp servers). This reduces ntp traffic at your firewall (your servers act as proxies) and reduces load on public servers. > 2. As per my understanding, peer association is ONLY for backup scenario . > If a peer loses time synchronization source, then other peers can be used > for time synchronization. Thus providing a HA service. But when everything > is ok (happy path), does defining NTP servers synced from different sources > as peers lead them to converge time as mentioned in some forums? Maybe; but the difference will be negligible (sub milliseconds). I wouldn't worry about that. Best Martin
