[ntp:questions] ntpd -qg VS ntpd in Linux client ?

Richard B. Gilbert rgilbert88 at comcast.net
Sat Apr 28 22:29:28 UTC 2007

Riccardo Castellani wrote:
> I'm interesting to align time in my four DB servers (HP-UX o.s.) of my company.
> But I'm not just sure to use ntpd -qg or ntpd as service.
> my doubts:
> -----
> if I use "ntpd -qg":

IIRC, ntpd -qg sets (steps) the time unconditionally (-q) and then quits 

> 1 - if server time is backward real time, does "ntpd -qg" slew time immediately ?
> 2 - if server time is forward real time (< 128 ms), does "ntpd -qg" slew time immediately ?
> 3  - if server time is forward real time (> 128 ms), does "ntpd -qg" sleps time ? but Does it complete its job before exit ( also if it occurs several days ) For example if offset  = 120s, "ntpd -qg" exits after local time is ok that is after several days ?
> -----
> 4- If I have offset = 120s what's difference in using "ntpd" and "ntpd -qg".
> 5- what traffic bandwith does ntpd use ? 
> For my opinion "ntpd -qg" is better for client, while ntpd as service it should be run in time server machines.
> What do you suggest me ?

Read and understand the ntpd documentation!

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