"[email protected]" <[email protected]> writes: >On Sep 29, 4:12=A0pm, Unruh <[email protected]> wrote:
>> Oddly enough, making sure that all of the computers are synchronized to >> UTC is probably the best way to ensure that they are all synchronized to >> each other. >Perhaps, but I haven't sorted out a way to achieve that with the >reference >NTP implementation, at least in a configuration that has redundancy >built-in. Picking one node to be the root of the internal ntp >heirarchy is >straightforward enough, but then I have to manage failover myself. Well, have 4 of them be the internal top level, and have the rest of the nodes use all 4 as their servers. Then make sure that if one looses sync with UTC, it drops down in stratum so that the rest of the machines will ignore it. >I can do that too, but I run into chicken and egg issues, in that the >cluster software needs the nodes to be in synch before starting, >so NTP must already be running. Uh, yes, the computer must run in order for the computer clock to run. That is Always true. >> For example, you could run a PPS line to each computer's >> parallel port and use the interrupt from that to sync that computer to >> that PPS. Or you could sync a bunch =A0of them to their own PPS source ( >> eg a number of gps). >With thousands of deployed systems, adding hardware simply >isn't an option. >> If the peer looses it external utc reference you could always have it up >> its level, so the rest would stop using it as a reference. >That's an interesting idea. Is there a way to implement that as a >configuration >option, or is that something I'd have to code myself? (The latter is >ok if necessary) >> One of the advantages of GPS is that it too exists in the field. And on >> house tops, and in the canyons ( well at least rooftops) of the concrete >> jungle. >Besides the issue of thousands of systems in use, there's the added >one that we're always deployed under a roof, never on top of it. :) Well, yes, but then lines run through the roof or a window are usually pretty easy. >thanks, >tim _______________________________________________ questions mailing list [email protected] https://lists.ntp.org/mailman/listinfo/questions
