hwclock failed to open in Xen guest with error: 'No usable clock interface found'

Solution Verified - Updated -

Issue

  • Xen Server domU reports following error when executing hwclock command:

    # hwclock --debug
    hwclock from util-linux-2.13-pre7
    hwclock: Open of /dev/rtc failed, errno=19: No such device.
    No usable clock interface found.
    Cannot access the Hardware Clock via any known method.
    
  • But, in the Hypervisor (dom0) this problem doesnt occur while running the hwclock command.

Environment

  • Red Hat Enterprise Linux 5.6
  • Xen DomU

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