[ntp:questions] Does NTP cause an abrupt/sudden change in an orphan's system time?

Arpith Nayak arpithnayak at gmail.com
Wed Aug 8 11:07:13 UTC 2012


What is the corresponding property I need to add in the .conf file to cause
a gradual sync of time with the public NTP server and not a sudden "step"?

Regards,
Arpith

On Wed, Aug 8, 2012 at 4:33 PM, Harlan Stenn <stenn at ntp.org> wrote:

> Arpith Nayak writes:
> > I have a server that is in the orphan mode i.e. it was not connected to
> the
> > internet (and thus the various public NTP servers) when I booted it up.
> Now
> > if I install ntpd oin this server and run it, will the first instance of
> > ntpd cause a sudden change in the system time as well as timestamps or
> does
> > NTP cause a slow gradual change so that it syncs up with the public
> server
> > over a period of time?
>
> If you don't override this in the ntp.conf file, it will "step" any
> change of greater than 128ms as soon as it knows the time.
>
> If you override this in the ntp.conf file (or via a startup option) it
> will slew the time gradually, but realize it may take a *very* long time
> to get the clock right.  This type of change is applied at 500ppm, so a
> change of 1 second will be applied over 2000 seconds.
>
> H
>


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