Stuart Maybee wrote:
Paul Jochum wrote:
Hi All:
I am running the following:
dom0: SunOS lss-nfsb01 5.11 snv_94 i86pc i386 i86xpv
with the following in my /etc/inet/ntp.conf:
[i]# --- OUR TIMESERVERS -----
server lss-time1.ih.lucent.com
server lss-time2.ih.lucent.com
server lss-time3.ih.lucent.com
[/i]
and the following command to start up the NTP service.
svcadm enable ntp
domU: CentOS 5.2 image, with no updates yet.
With ntp running on dom0, the time is accurate (within 200 milliseconds
normally, which is very acceptable). Both dom0 and all of the domU's are set
up for the same time zone, which is 5 hours behind UTC (Central Daylight Time)
However, on the domU's (which are not running ntp), the clock are consistently
5 hour behind the dom0 (again, within 200 milliseconds). To me, it looks like
Dom0 is not passing UTC to domU, but rather is passing the wall clock to domU.
So, is anyone else seeing this behavior, or did I make a mistake in my setup
somewhere?
thanks,
Paul
Solaris programs the "hardware clock" to be kept in UTC(GMT). When
running on the hypervisor the hypervisor provides the simulated clock to
the domU's. However, setting the time in your Solaris dom0 should set
the time that the hypervisor provides to the domU's. I don't know how
Linux expects the time to be kept in the hardware nor how often Linux
checks the "Hardware" time after initially reading it. So you should at
least be sure that your Dom0 has set the time correctly before starting
your domU's.
What is the output of the rtc command on dom0? (or alternately, what is
the contents of /etc/rtc_config on your dom0?
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Hi Stuart:
Yes, Dom0 is keeping time accurately (using ntpdate command, the
time is accurate). Other than the 5 hour offset, the DomU's are also
accurate (or at least seem to be for me, around 200 ms in my testing so
far).
The outputs from Dom0 are:
$ rtc
US/Central
$ more /etc/rtc_config
#
# This file (/etc/rtc_config) contains information used to manage the
# x86 real time clock hardware. The hardware is kept in
# the machine's local time for compatibility with other x86
# operating systems. This file is read by the kernel at
# boot time. It is set and updated by the /usr/sbin/rtc
# command. The 'zone_info' field designates the local
# time zone. The 'zone_lag' field indicates the number
# of seconds between local time and Greenwich Mean Time.
#
zone_info=US/Central
zone_lag=18000
$
thanks,
Paul
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