On Wed, May 1, 2019 at 5:48 PM Keith Medcalf <kmedc...@dessus.com> wrote:
> If you have one such installation, then you really do not care about the > "accuracy" of the time. However if you have multiple such installations > then you want them all to have the same time (if you will be comparing logs > between them, for example). At some point it becomes "cheaper" to spend > thousands of dollars per site to have a single Stratum 0 timesource (for > example, the GPS system) at each site (and thus comparable time stamps) > than it is to pay someone to go though the rigamarole of computing offsets > and slew rates between sites to be able to do accurate comparison. And if > you communicate any of that info to outsiders then being able to say "my > log timestamps are accurate to +/- 10 nanoseconds so it must be you who is > farked up" (and be able to prove it) has immense value. > If your network is air gapped from the Internet then sure. If it's not, you can run NTP against a reasonably reliable set of time sources (not random picks from Pool) and be able to say, "my log timestamps are accurate to +/- 10 milliseconds so it must be you who is farked up." While my milliseconds loses the pecking order contest, it's just as good for practical purposes and a whole lot less expensive. If your system is Internet-connected. If you run an air gapped network then yeah, get your time out of band. Regards, Bill Herrin -- William Herrin ................ her...@dirtside.com b...@herrin.us Dirtside Systems ......... Web: <http://www.dirtside.com/>
