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Domain Member clock off by 7-15 seconds after reboot. RRS feed

  • Question

  • We have a number of servers running Windows Server 2003 and Windows Server 2003 R2 which we are seeing some weird issues with on reboot. These systems are all members of our AD domain (domain controllers are running Windows Server 2008) and are configured to obtain time from the domain hierarchy with default settings.

    Whenever we reboot these systems (done every morning) the time is off by some number of seconds, typically between 7 and 15 depending on the box. Within 10-15 minutes, Windows Time Service has resynchronized the clocks to the domain. I know the CMOS clock is somewhat inaccurate, but this seems a bit much for a reboot that takes all of 5-10 minutes.

    Can anyone tell me what the relationship between the system clock and CMOS clock is in Windows? Is the current time written to the hardware clock only periodically? When it's off by some threshold amount?

    Thanks,

    --
    Phil
    Tuesday, October 20, 2009 6:25 AM

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