OT: clock drift (was: Re: logging postfix and others)

[David J. Haines]

Actually, running ntpdate won't help keep your clock from drifting.   
It only sets the clock once, at the time it is run.  After that, your  
clock is free to drift - and this does happen.  To keep your clock set  
and to correct for drift, you need to use ntpd.  The "set time and  
date automatically" checkbox makes OS X run ntpd.  NTP does a really  
good job of keeping things synchronized, taking into account network  
lag, and slowly adjusting the clock over time, so as to avoid "jumps"  
in time.

On Mar 2, 2009, at 6:21 AM, Ryan Schmidt wrote:

>
> On Mar 1, 2009, at 03:37, Scott Haneda wrote:
>
>> First thing I do in setting up a new server is comment out the log  
>> rollers, second is set up a ntpudpate command in launchd to keep  
>> the clock from drifting.
>
> I realize this is off-topic now, but you've made me curious. Can the  
> clock drift if you do not do this? I thought Apple's "set date and  
> time automatically" option was supposed to ensure clocks were  
> synchronized. Though I admit I don't know what it does specifically.
>
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