topic NTP synchronisation in Operating System - HP-UX

NTP synchronisation

Neil Wilson_2 — Thu, 04 Aug 2005 09:04:34 GMT

Hi everyone,

I've configured NTP and started xntpd but the time sync'd straight away, jumping forward 10 mins or so. Luckily this is a DR system and there are no database on it!

Anyway I seem to recall there is a way to stop "instant" synchronisation and have the server sync over a slower period of time. Any ideas what that is ? (i have /etc/ntp.drift created, no values in it).

NW

Re: NTP synchronisation

Devender Khatana — Thu, 04 Aug 2005 09:14:29 GMT

Hi,

The time of the server which got synced was probably more than the time of the server you synced to. This is the normal behaviour in this case and before starting the application ( Databases) you should ensure that time has got synced. If the synchronization is done in reverse order then I suppose it will go slow only.

HTH,
Devender

Re: NTP synchronisation

A. Clay Stephenson — Thu, 04 Aug 2005 09:19:46 GMT

If you start the xntpd daemon with the "-x" option, it will alwaqys slew the time rather than doing a step adjustment.

Re: NTP synchronisation

Andrew Merritt_2 — Thu, 04 Aug 2005 09:21:41 GMT

Have you tried 'man xntpd'? There's a discussion there of the way the time is adjusted when the '-x' (SLEW) option is selected.

Andrew

Re: NTP synchronisation

Steven E. Protter — Thu, 04 Aug 2005 09:29:50 GMT

Jumping forward is not usually a problem, even for production Database servers.

Jumping backward is a potential system crashing, database corrupting disaster waiting to happen.

I think the -x option is the best way to go. Should be configurable in the conf file or if it uses a parameter file in /etc/rc.config.d/

SEP