On Thu, Nov 10, 2005 at 06:49:01AM -0500, Bob Chiodini wrote:
> On Wed, 2005-11-09 at 10:40 -0800, Brian D. McGrew wrote:
> > Running a Dell PE850 with FC4 installed. I used rdate -s to set the
> > clock and the time is correct. I even have it in the crontab tab.
> >
> > When the machine reboots, the clock is wrong, way wrong by anywhere from
> > 6 to 12 hours. How do I get the clock to sync up at reboot time?
> >
> > -brian
> >
> > Brian D. McGrew { brian@xxxxxxxxxxxxx || brian@xxxxxxxxxxxxxxxxxxx }
> > --
> > > Those of you who think you know it all,
> > really annoy those of us who do!
> >
> Brian,
>
> Are you cleanly rebooting the system?
>
> /etc/init.d/halt contains code to set the hardware clock to the system
> (software) clock. Unless the motherboard battery is failing, or the
> system was not properly shutdown/rebooted the H/W clock should not drift
> that much.
>
> Running rdate from cron only sets the system clock, not the H/W clock.
> You should also run hwclock --systohc in the same cron job.
>
> As suggested by Yonas and Alexander, NTP is another solution, but it
> will not correct the H/W clock by itself. You still must insure that
> hwclock runs, either periodically, or at shutdown.
>
> What is the BIOS time immediately after shutting down?
>
>
> Bob...
This is a periodic problem that someone down here was complaining about
just today. When you boo t hwclock is run to set the system clock to
the hardware clock. That code is in /etc/rc.d/rcsysinit
When you halt hwclock is run to reverse the process. That code is in
/etc/init.d/halt.
Check to see that the running of the hwclock -systohc and
hwclock -hctosys both run correctly. Further check whether the hwclock is
drifting due to a weak battery.
--
=======================================================================
I'd rather laugh with the sinners,
Than cry with the saints,
The sinners are much more fun!
-- Billy Joel, "Only The Good Die Young"
-------------------------------------------
Aaron Konstam
Computer Science
Trinity University
telephone: (210)-999-7484
