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Bug 11020 - Hardware clock not adjusted for skew.
Hardware clock not adjusted for skew.
Status: CLOSED DUPLICATE of bug 1142
Product: Red Hat Linux
Classification: Retired
Component: xntp3 (Show other bugs)
All Linux
medium Severity low
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Assigned To: Jeff Johnson
Depends On:
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Reported: 2000-04-24 18:50 EDT by Sam Varshavchik
Modified: 2008-05-01 11:37 EDT (History)
1 user (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
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Clone Of:
Last Closed: 2000-05-05 14:04:12 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Sam Varshavchik 2000-04-24 18:50:12 EDT
I find that xntp does not adjust the realtime hardware BIOS clock, only the
system clock.  Over time, if a significant skew builds up, on the next
reboot the clock will be thrown back.

If the master is rebooted, when there's a skew, all the slaves will get
their clocks reset.  If the slave is rebooted, several minutes will go by,
then the slave's clock will be jump by a large amount, when it is
resynchronized with a master.

Solution:  add the following to /etc/rc.d/init.d/xntpd, after the killproc
that stops the daemon:

   /sbin/hwclock --systohc

This will adjust the hardware clock with the accumulated skew, before the
system shutdown.
Comment 1 Daniel Roesen 2000-04-27 02:18:59 EDT
xntpd should update the RTC itself. Are you running on Compaq ProLiant hardware?
I think i noticed this problem on ProLiants (hwclock --systohc being unable to
update the RTC).
Comment 2 Jeff Johnson 2000-05-05 14:04:59 EDT
*** This bug has been marked as a duplicate of 1142 ***

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