Notes on XenServer and NTP

  • XenServer syncs with the NTP server anytime between once every one minute and once every 15-20 minutes, depending on the amount of “drift” your hardware clock exhibits (ref)
  • XenServer syncs the hardware clock with the system clock automatically – I think when ntp starts (ref: /etc/rc.d/init.d/ntpd – on XenServer 5.6 SP 2)
  • VMs (both with and without XenServer Tools) have their hardware clocks synced with XenServers system clock when they start up – if you try and use a command like “hwclock -r” and get the message that the hardware clock cannot be accessed; do not worry, it still works



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