Date: Wed, 2 Feb 2005 19:05:27 -0500 From: David Magda <dmagda@ee.ryerson.ca> To: "Eli K. Breen" <eli@gopostal.ca> Cc: freebsd-stable@freebsd.org Subject: Re: Adjusting time on a secured FreeBSD machine. Message-ID: <64c5e2ba1167d18c672dadc0c93a0879@ee.ryerson.ca> In-Reply-To: <42014C9B.7090609@gopostal.ca> References: <42014C9B.7090609@gopostal.ca>
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On Feb 2, 2005, at 16:56, Eli K. Breen wrote: > Lastly this machine is in production and cannot be rebooted. Stop the NTP daemon and restart it so that it uses the "-x" option. From ntpd(8): > -x Normally, the time is slewed if the offset is less than > the step > threshold, which is 128 ms by default, and stepped if > above the > threshold. This option forces the time to be slewed in > all > cases. If the step threshold is set to zero, all offsets > are > stepped, regardless of value and regardless of the -x > option. In > general, this is not a good idea, as it bypasses the > clock state > machine which is designed to cope with large time and > frequency > errors Note: Since the slew rate is limited to 0.5 ms/s, > each > second of adjustment requires an amortization interval of > 2000 s. > Thus, an adjustment of many seconds can take hours or > days to > amortize. This option can be used with the -q option. When you restart it make sure it's done with all the CLI options it has now, with the addition of the "-x".
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