[CentOS] Gradually adjust NTP sync over time?

2012-09-04 Thread Sean Carolan
Suppose you have server A and server B. Server B is running 60 seconds too fast, while server A is accurate. Is there a way to gradually move server B's time back into sync with server A, without making a drastic, immediate change to the clock? In other words, we would like to 'smear' the

Re: [CentOS] Gradually adjust NTP sync over time?

2012-09-04 Thread Brian Mathis
On Tue, Sep 4, 2012 at 12:17 PM, Sean Carolan scaro...@gmail.com wrote: Suppose you have server A and server B. Server B is running 60 seconds too fast, while server A is accurate. Is there a way to gradually move server B's time back into sync with server A, without making a drastic,

Re: [CentOS] Gradually adjust NTP sync over time?

2012-09-04 Thread Sean Carolan
This is already how ntpd works. When you first start the service (usually upon reboot), it will use 'ntpdate' to do a hard set of the clock, then ntpd picks up and adjusts the clock back and forth to keep it correct. My understanding was that ntpd will use slewing for adjustments of less

Re: [CentOS] Gradually adjust NTP sync over time?

2012-09-04 Thread Sean Carolan
What I'm trying to avoid is abruptly resetting the clock from 12:06 to 12:05 all at once. Instead we want to slowly turn the clock back that one minute, but spread the changes across several hours or days. I think the -x option may be our solution; I R'd the FM and it says: ...If the -x